ASTM C1695-22

Standard Specification for Fabrication of Flexible Removable and Reusable Blanket Insulation for Hot Service

ABSTRACT
This specification details the minimum property, design and construction requirements for flexible removable and reusable blanket insulation for hot service of above ambient temperatures. Insulation must be one of the following flexible fibrous materials acceptable for the maximum temperature of service: high temperature fiber blanket of any type or grade; needled glass fiber mechanically bonded felt; and mineral fiber blanket of the type suitable for the application. The material for the outer jacket liner and straps, where used, shall either be plain woven glass fiber fabric or that which has been treated with a water resistant compound such as silicone or fluorocarbon, and conforms with the following requirements: minimum weight; breaking strength; tear strength; burst strength; abrasion resistance; color; temperature resistance; and flame resistance.
SCOPE
1.1 This specification addresses the minimum requirements for materials and fabrication of flexible removable and reusable blanket insulation for hot service, from above ambient temperatures to 1000°F (538°C).  
1.2 This specification separately addresses industrial applications, outdoor commercial applications, and indoor commercial applications. Blanket insulation for industrial applications and outdoor commercial applications must be weather resistant and resistant to liquid chemicals. Blanket insulation for indoor commercial applications is limited to 500°F (260°C) maximum use temperature, is not required to be either weather resistant or resistant to chemicals, and is typically used for HVAC, plumbing, and other light grade indoor piping systems that distribute steam or water, or both.  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Sep-2022
• ICS: 13.340.99 - Other protective equipment
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.40 - Insulation Systems

Relations

• Refers: ASTM C168-24 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 15-Apr-2024
• Refers: ASTM D5587-15(2024) - Standard Test Method for Tearing Strength of Fabrics by Trapezoid Procedure
• Effective Date: 01-Jan-2024
• Refers: ASTM C1086-20 - Standard Specification for Glass Fiber Mechanically Bonded Felt Thermal Insulation
• Effective Date: 01-Apr-2020
• Refers: ASTM C1728-20 - Standard Specification for Flexible Aerogel Insulation
• Effective Date: 01-Feb-2020
• Refers: ASTM C553-13(2019) - Standard Specification for Mineral Fiber Blanket Thermal Insulation for Commercial and Industrial Applications
• Effective Date: 01-Sep-2019
• Refers: ASTM D5587-15(2019) - Standard Test Method for Tearing Strength of Fabrics by Trapezoid Procedure
• Effective Date: 01-Jul-2019
• Refers: ASTM D5035-11(2019) - Standard Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method)
• Effective Date: 01-Jul-2019
• Refers: ASTM C892-19 - Standard Specification for High-Temperature Fiber Blanket Thermal Insulation
• Effective Date: 01-Mar-2019
• Refers: ASTM C892-18a - Standard Specification for High-Temperature Fiber Blanket Thermal Insulation
• Effective Date: 01-Nov-2018
• Refers: ASTM C892-18 - Standard Specification for High-Temperature Fiber Blanket Thermal Insulation
• Effective Date: 01-May-2018
• Refers: ASTM C168-18 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 15-Apr-2018
• Refers: ASTM C892-17 - Standard Specification for High-Temperature Fiber Blanket Thermal Insulation
• Effective Date: 01-Dec-2017
• Refers: ASTM D3776/D3776M-09a(2017) - Standard Test Methods for Mass Per Unit Area (Weight) of Fabric
• Effective Date: 15-Jul-2017
• Refers: ASTM C168-17 - Standard Terminology Relating to Thermal Insulation
• Effective Date: 01-Jun-2017
• Refers: ASTM C1129-17 - Standard Practice for Estimation of Heat Savings by Adding Thermal Insulation to Bare Valves and Flanges
• Effective Date: 01-Mar-2017

Overview

ASTM C1695-22: Standard Specification for Fabrication of Flexible Removable and Reusable Blanket Insulation for Hot Service is a critical international standard developed by ASTM for the thermal insulation industry. This specification sets the minimum requirements for the materials, design, and construction of flexible, removable, and reusable insulation blankets used in hot service applications above ambient temperatures, up to 1000°F (538°C). The standard covers a range of fibrous insulation materials including high-temperature fiber blankets, needled glass fiber felts, mineral fiber blankets, microporous thermal insulation, and flexible aerogel insulation, all tailored for specific operational requirements.

Key Topics

• Material Requirements: The standard outlines acceptable insulation materials, including high-temperature fiber blankets (per ASTM C892), needled glass fiber felt (ASTM C1086), mineral fiber blankets (ASTM C553), microporous insulation (ASTM C1676), and aerogel insulation (ASTM C1728). For outer jackets, liners, and straps, woven glass fiber fabric treated with water-resistant compounds such as silicone or PTFE is specified.
• Performance Criteria: Materials must meet specified minimums for weight, breaking strength, tear strength, burst strength, abrasion resistance, temperature resistance, and flame resistance.
• Fabrication and Design: Requirements include pre-measurement for a tight fit, construction details for seams, parting faces for drainage, overlap with adjacent insulation, and geometric design to avoid force-folding. There are also detailed stipulations for tie-down straps, drawstrings, and identification tags.
• Application-Specific Criteria: The standard distinguishes between industrial, outdoor commercial, and indoor commercial applications:
  • Industrial and outdoor applications require weather and chemical resistance.
  • Indoor commercial insulation (e.g., HVAC or plumbing) is rated for temperatures up to 500°F (260°C) and is typically not required to provide weather or chemical resistance.
• Quality Assurance: Detailed inspection, rejection, and tagging protocols ensure correct identification and tracking of insulation products.

Applications

ASTM C1695-22 is essential for industries where energy conservation, safety, and maintenance flexibility are critical. Examples include:

• Industrial Facilities: Insulation for valves, flanges, piping, and equipment operating at high temperatures, often exposed to outdoor conditions, chemicals, or physical abuse.
• Power Plants and Refineries: Removable and reusable blankets allow for easy access for inspection and maintenance while providing thermal efficiency and personnel protection.
• HVAC and Commercial Plumbing Systems: Indoor removable insulation for steam, hot water, and process piping ensures easy maintenance while maintaining energy efficiency.
• OEM Equipment: Manufacturers can design equipment with tailored, removable insulation solutions that meet demanding operational or environmental requirements.

Removable and reusable insulation blankets built to ASTM C1695-22 offer significant benefits, such as:

• Simplified maintenance and inspection with minimal downtime
• Enhanced worker safety through controlled surface temperatures
• Improved process efficiency via consistent thermal insulation
• Reduced waste and cost over the lifecycle of insulated assets

Related Standards

ASTM C1695-22 is closely linked to several other ASTM standards for insulation materials and testing, including:

• ASTM C168: Terminology Relating to Thermal Insulation
• ASTM C553: Specification for Mineral Fiber Blanket Thermal Insulation
• ASTM C892: Specification for High-Temperature Fiber Blanket Thermal Insulation
• ASTM C1086: Specification for Glass Fiber Mechanically Bonded Felt Thermal Insulation
• ASTM C1676: Specification for Microporous Thermal Insulation
• ASTM C1728: Specification for Flexible Aerogel Insulation
• ASTM C1129: Practice for Estimation of Heat Savings by Adding Thermal Insulation
• ASTM D3389/D3776/D3786/D5034/D5035/D5587/D6413: Various tests for textile performance (abrasion, weight, burst strength, breaking and tear strength, and flame resistance)
• MIL-C-20079H: Military Specification for Glass Cloth and Yarn

Enterprises implementing ASTM C1695-22 can ensure compliance, enhance facility reliability, and maximize energy management in high-temperature environments.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:C1695 −22
Standard Specification for
Fabrication of Flexible Removable and Reusable Blanket
Insulation for Hot Service
This standard is issued under the fixed designation C1695; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 This specification addresses the minimum requirements 2.1 ASTM Standards:
formaterialsandfabricationofflexibleremovableandreusable C168 Terminology Relating to Thermal Insulation
blanket insulation for hot service, from above ambient tem- C553 Specification for Mineral Fiber Blanket Thermal Insu-
peratures to 1000°F (538°C). lation for Commercial and Industrial Applications
C892 Specification for High-Temperature Fiber Blanket
1.2 This specification separately addresses industrial
Thermal Insulation
applications, outdoor commercial applications, and indoor
C1086 Specification for Glass Fiber Mechanically Bonded
commercial applications. Blanket insulation for industrial ap-
Felt Thermal Insulation
plications and outdoor commercial applications must be
C1129 Practice for Estimation of Heat Savings by Adding
weather resistant and resistant to liquid chemicals. Blanket
Thermal Insulation to Bare Valves and Flanges
insulation for indoor commercial applications is limited to
C1676 Specification for Microporous Thermal Insulation
500°F(260°C)maximumusetemperature,isnotrequiredtobe
C1728 Specification for Flexible Aerogel Insulation
either weather resistant or resistant to chemicals, and is
D3389 Test Method for Coated FabricsAbrasion Resistance
typically used for HVAC, plumbing, and other light grade
(Rotary Platform Abrader)
indoor piping systems that distribute steam or water, or both.
D3776/D3776M Test Methods for Mass Per Unit Area
1.3 The values stated in inch-pound units are to be regarded
(Weight) of Fabric
as standard. The values given in parentheses are mathematical
D3786/D3786M Test Method for Bursting Strength of Tex-
conversions to SI units that are provided for information only
tile Fabrics—Diaphragm Bursting StrengthTester Method
and are not considered standard.
D5034 TestMethodforBreakingStrengthandElongationof
1.4 This standard does not purport to address all of the Textile Fabrics (Grab Test)
safety concerns, if any, associated with its use. It is the
D5035 Test Method for Breaking Force and Elongation of
responsibility of the user of this standard to establish appro- Textile Fabrics (Strip Method)
priate safety, health, and environmental practices and deter-
D5189 Test Method for Temperature Corresponding To
mine the applicability of regulatory limitations prior to use. Vapor-Liquid Ratio Of 20 For Gasoline And Gasoline-
1.5 This international standard was developed in accor-
Oxgenate Blends (Bomb Method) (Withdrawn 1993)
dance with internationally recognized principles on standard- D5587 Test Method for Tearing Strength of Fabrics by
ization established in the Decision on Principles for the
Trapezoid Procedure
Development of International Standards, Guides and Recom- D6413/D6413M Test Method for Flame Resistance of Tex-
mendations issued by the World Trade Organization Technical
tiles (Vertical Test)
Barriers to Trade (TBT) Committee.
1 2
This specification is under the jurisdiction of ASTM Committee C16 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Thermal Insulation and is the direct responsibility of Subcommittee C16.40 on contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Insulation Systems. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Oct. 1, 2022. Published October 2022. Originally the ASTM website.
approved in 2009. Last previous edition approved in 2020 as C1695 – 20. DOI: The last approved version of this historical standard is referenced on
10.1520/C1695-22. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1695−22
2.2 Other Standards: 4.1.1 High Temperature Fiber Blanket per Specification
MIL-C-20079H Military Specification Cloth, Glass; Tape, C892, any Type or Grade.
Textile Glass and Thread, Glass and Wire Reinforced
4.1.2 Needled Glass Fiber Mechanically Bonded Felt per
Glass
Specification C1086.
4.1.3 Mineral Fiber Blanket, per Specification C553,ofthe
3. Terminology
Type suitable for the application.
3.1 General—Definitions included in Terminology C168
4.1.4 Microporous Thermal Insulation, per Specification
shall apply to the terms used in this specification.
C1676, of the Type and Grade suitable for the application.
3.2 Definitions of Terms Specific to This Standard:
4.1.5 Flexible Aerogel Insulation, per Specification C1728,
3.2.1 coated fabric, n—Awoven fabric coated with a rubber
of the Type, Grade, and Category suitable for the application.
or plastic compound such that the woven fabric material itself
4.1.6 Alternative insulation materials shall only be used
is not exposed to the environment.
with design engineer/specifier or purchaser’s prior approval.
3.2.2 commercial applications for removable blanket
4.2 Material for the outer jacket, liner and straps, where
insulation, n—applications of flexible removable/reusable
used,shallbewovenglassfibercloththathasbeentreatedwith
blanket insulation that do not require high physical abuse
a water resistant compound, such as silicone rubber or poly-
resistance but do require protection from leaking water or
tetrafluoroethylene(PTFE),thatissuitableforbothinteriorand
steam, or both, such as might be found in HVAC or plumbing
exterior use, and having the properties as shown in Table 1.
piping systems.
4.3 The Surface Temperature Limit for glass fiber fabric
3.2.3 D-ring, n—a section of heavy wire which forms a
coated with Silicone rubber shall be a minimum of 500°F
complete loop in either a rectangular shape or the shape of the
(260°C). The Surface Temperature Limit for glass fiber fabric
capital letter “D”, that is used in removable insulation blankets
coated with PTFE shall be a minimum of 600°F (315°C).
for attaching a fabric strap that secures the blanket around a
Material for the inner jacket shall be the same as for the outer
pipe component or piece of equipment.
jacket for surface temperatures less than the selected material’s
3.2.4 hook and loop fastener, n—a woven molded fabric
Surface Temperature Limit.
material that has small hooks on one part and small loops on
4.3.1 For surfaces exceeding the Surface Temperature Lim-
the other such that, when pressed together, they adhere to one
its of either glass fiber fabric coated with Silicone rubber or
anotherandfurther,requiringasignificantforcetoseparateone
PTFE up to 1000°F (538°C) where leaks of process fluids are
another.
not expected, the inner layer and gussets shall be one of the
3.2.5 industrial applications for removable blanket
following, or in combination:
insulation, n—applications for flexible removable/reusable
4.3.1.1 a plain, heat cleaned, glass fiber fabric,
blanketinsulationthatrequirehigherphysicalabuseresistance,
4.3.1.2 a Type 304 stainless steel wire knitted mesh made
protection from the weather and leaking chemicals, and can be
from 0.008 in. (0.20 mm) diameter wire with nominal 6 to 8
exposed to outdoor conditions.
openings per inch (25.4 mm).
3.2.6 lacing anchor, n—a metal disk, located on the outside
4.3.2 For surfaces exceeding the Surface Temperature Lim-
of an insulation blanket, that is secured to a pin that passes
its of either glass fiber fabric coated with Silicone rubber or
through the blanket; the assembly is used to wrap tire wire
PTFE and where leaks of process fluids are expected, such as
around so as to secure an insulation blanket around a pipe
flange pairs and valves, the inner layer and gussets shall be as
component or piece of equipment.
specified in 4.3.1 and 4.3.1.1 above but also with Type 304
3.2.7 lacing hook, n—a metal hook that is located on the
stainless steel foil that has a minimum thickness of 0.001 in.
outside surface of an insulation blanket and that is secured
(0.025 mm). This foil shall be placed between the hot surface
through the blanket; tie wire is wrapped around it so as to
and the insulation material.
secure an insulation blanket around a pipe component or piece
4.4 All hardware such as D-rings, buckles, tags, quilting
of equipment.
pins, lacing hooks and insulation anchors, etc. shall be made of
3.2.8 removable and reusable blanket insulation, n—An
Type 304 stainless steel. Where lacing hooks and lacing
insulation blanket, encased in woven fabric and/or woven wire
anchors are used, they shall be 12 or 14 Gauge.
mesh, that has attachment mechanisms designed to allow the
assembly to be installed, then later removed and reinstalled,
4.5 Tie-Down Straps:
without using any new insulation or fabric materials.
4.5.1 Industrial Applications and Outdoor Commercial
Applications—These tie-down straps shall be constructed of
4. Materials
the same material as the outer jacket with a double thickness
4.1 Insulation shall be of a flexible fibrous material accept-
and an edge trim sewn in place along both edges.
able for the maximum temperature of the application. Accept-
4.5.2 Indoor Commercial Applications Only—These tie-
able materials must be one of the following:
downstrapsshallbeconstructedeitherofthesamematerialsas
for applications specified in 4.5.1, or stand-alone hook and
loopfastenermaterialswithaminimumupperservicetempera-
Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
Philadelphia, PA 19111-5094, http://quicksearch.dla.mil. ture of 220°F (104°C). Minimum width of the hook and loop
C1695−22
TABLE 1 Physical and Performance Requirements for Fabrics
Plain, heat cleaned Glass fiber fabric Glass fiber fabric Glass fiber fabric coated
A
glass fiber fabric coated with silicone rubber, for coated with silicone rubber, with PTFE
exterior applications for interior applications only
Weight (minimum) 17.7 (602) 16.5 (561) 13.5 (455) 16.5 (561)
oz/sq. yd (g/m )
per Test Methods D3776/
D3776M
Breaking Strength (minimum) Warp 200 (35.7) Warp 225 (40.19) Warp 125 (22.4) Warp 225 (40.19)
lb/inch (kg/cm) per Fill 100 (17.9) Fill 175 (31.26) Fill 100 (17.9) Fill 175 (31.26)
Test Methods D5034
or D5035
A
Tearing Strength (minimum) lb See Warp 40 (18.14) Warp 30 (13.6) Warp 40 (18.14)
(kg) Fill 25 (11.33) Fill 20 (9.1) Fill 25 (11.33)
per Test Method D5587
Burst Strength (minimum) psi
(kg/cm )
Not Applicable 200 (14) 150 (9.77) 200 (14)
per Test Method D3786/
D3786M
A
Abrasion Resistance See CS-10 Wheel, 500 g loads CS-10 Wheel, 500 g loads CS-10 Wheel, 500 g loads
per Test Method D3389 500 revs, 15 % weight loss 500 revs, 15 % weight loss 500 revs, 15 % weight loss max
max max
Color beige Gray – Other colors are accept- Gray – Other colors are accept- Gray – Other colors are accept-
able that meet buyer’s color able that meet buyer’s color able that meet buyer’s color
needs needs needs
A
Flame Resistance See Char Length 1 in. max. Char Length 1 in. max. Char Length 1 in. max.
Test Method D6413/D6413M (25.4 cm) (25.4 cm) (25.4 cm)
Afterglow 3 seconds max. Afterglow 3 seconds max. Afterglow 3 seconds max.
Flame out 1 second max. Flame out 1 second max. Flame out 1 second max.
A
Meets MIL-C-20079H, Type 1, Class 9.
fastenermaterialshallbe0.75 in.(19 mm).RefertoTable2for 5. Geometric Design and Fabrication
physical and performance requirements for hook and loop
5.1 Insulated items shall be pre-measured to assure a tight
fasteners.
fit. Allowances shall be made for valve bonnet height, gland
4.6 Drawstring
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C1695 − 20 C1695 − 22
Standard Specification for
Fabrication of Flexible Removable and Reusable Blanket
Insulation for Hot Service
This standard is issued under the fixed designation C1695; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This specification addresses the minimum requirements for materials and fabrication of flexible removable and reusable
blanket insulation for hot service, from above ambient temperatures to 1000°F (538°C).
1.2 This specification separately addresses industrial applications, outdoor commercial applications, and indoor commercial
applications. Blanket insulation for Industrial Applicationsindustrial applications and outdoor Commercial Applicationscommer-
cial applications must be weather resistant orand resistant to liquid chemicals, or both. chemicals. Blanket insulation for indoor
Commercial Applicationscommercial applications is limited to 500°F (260°C) maximum use temperature, is not required to be
either weather resistant or resistant to chemicals, and is typically used for HVAC, plumbing, and other light grade indoor piping
systems that distribute steam or water, or both.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C168 Terminology Relating to Thermal Insulation
C553 Specification for Mineral Fiber Blanket Thermal Insulation for Commercial and Industrial Applications
C892 Specification for High-Temperature Fiber Blanket Thermal Insulation
C1086 Specification for Glass Fiber Mechanically Bonded Felt Thermal Insulation
C1129 Practice for Estimation of Heat Savings by Adding Thermal Insulation to Bare Valves and Flanges
C1676 Specification for Microporous Thermal Insulation
C1728 Specification for Flexible Aerogel Insulation
This specification is under the jurisdiction of ASTM Committee C16 on Thermal Insulation and is the direct responsibility of Subcommittee C16.40 on Insulation
Systems.
Current edition approved April 1, 2020Oct. 1, 2022. Published April 2020October 2022. Originally approved in 2009. Last previous edition approved in 20192020 as
C1695 – 19.C1695 – 20. DOI: 10.1520/C1695-20.10.1520/C1695-22.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1695 − 22
D3389 Test Method for Coated Fabrics Abrasion Resistance (Rotary Platform Abrader)
D3776/D3776M Test Methods for Mass Per Unit Area (Weight) of Fabric
D3786/D3786M Test Method for Bursting Strength of Textile Fabrics—Diaphragm Bursting Strength Tester Method
D5034 Test Method for Breaking Strength and Elongation of Textile Fabrics (Grab Test)
D5035 Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method)
D5189 Test Method for Temperature Corresponding To Vapor-Liquid Ratio Of 20 For Gasoline And Gasoline-Oxgenate Blends
(Bomb Method) (Withdrawn 1993)
D5587 Test Method for Tearing Strength of Fabrics by Trapezoid Procedure
D6413/D6413M Test Method for Flame Resistance of Textiles (Vertical Test)
2.2 Other Standards:
MIL-C-20079H Military Specification Cloth, Glass; Tape, Textile Glass and Thread, Glass and Wire Reinforced Glass
3. Terminology
3.1 General—Definitions included in Terminology C168 shall apply to the terms used in this specification.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 coated fabric, n—A woven fabric coated with a rubber or plastic compound such that the woven fabric material itself is not
exposed to the environment.
3.2.2 commercial applications for removable blanket insulation, n—applications of flexible removable/reusable blanket insulation
that do not require high physical abuse resistance but do require protection from leaking water or steam, or both, such as might
be found in HVAC or plumbing piping systems.
3.2.3 D-ring, n—a section of heavy wire which forms a complete loop in either a rectangular shape or the shape of the capital
letter “D”, that is used in removable insulation blankets for attaching a fabric strap that secures the blanket around a pipe
component or piece of equipment.
3.2.4 hook and loop fastener, n—a woven molded fabric material that has small hooks on one part and small loops on the other
such that, when pressed together, they adhere to one another and further, requiring a significant force to separate onone another.
3.2.5 industrial applications for removable blanket insulation, n—applications for flexible removable/reusable blanket insulation
that require highhigher physical abuse resistance, protection from the weather and leaking chemicals, and can be exposed to
outdoor conditions.
3.2.6 lacing anchor, n—a metal disk, located on the outside of an insulation blanket, that is secured to a pin that passes through
the blanket; the assembly is used to wrap tire wire around so as to secure an insulation blanket around a pipe component or piece
of equipment.
3.2.7 lacing hook, n—a metal hook that is located on the outside surface of an insulation blanket and that is secured through the
blanket; tie wire is wrapped around it so as to secure an insulation blanket around a pipe component or piece of equipment.
3.2.8 removable and reusable blanket insulation, n—An insulation blanket, encased in woven fabric and/or woven wire mesh, that
has attachment mechanisms designed to allow the assembly to be installed, then later removed and reinstalled, without using any
new insulation or fabric materials.
4. Materials
4.1 Insulation shall be of a flexible fibrous material acceptable for the maximum temperature of the application. Acceptable
materials must be one of the following:
4.1.1 High Temperature Fiber Blanket per Specification C892, any Type or Grade.
The last approved version of this historical standard is referenced on www.astm.org.
Available from DLA Document Services, Building 4/D, 700 Robbins Ave., Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
C1695 − 22
4.1.2 Needled Glass Fiber Mechanically Bonded Felt per Specification C1086.
4.1.3 Mineral Fiber Blanket, per Specification C553, of the Type suitable for the application.
4.1.4 Microporous Thermal Insulation, per Specification C1676, of the Type and Grade suitable for the application.
4.1.5 Flexible Aerogel Insulation, per Specification C1728, of the Type, Grade, and Category suitable for the application.
4.1.6 Alternative insulation materials shall only be used with design engineer/specifier or purchaser’s prior approval.
4.2 Material for the outer jacket, liner and straps, where used, shall be woven glass fiber cloth that has been treated with a water
resistant compound, such as silicone rubber or fluorocarbon, polytetrafluoroethylene (PTFE), that is suitable for both interior and
exterior use, and having the properties as shown in Table 1.
4.3 The Surface Temperature Limit for glass fiber fabric coated with Silicone rubber shall be a minimum of 500°F (260°C). The
Surface Temperature Limit for glass fiber fabric coated with PTFE shall be a minimum of 600°F (315°C). Material for the inner
jacket shall be the same as for the outer jacket for surface temperatures less than 500°F (260°F°C).the selected material’s Surface
Temperature Limit.
4.3.1 For surfaces from 501°F (261°C) exceeding the Surface Temperature Limits of either glass fiber fabric coated with Silicone
rubber or PTFE up to 1000°F (538°C) where leaks of process fluids are not expected, the inner layer and gussets shall be one of
the following:following, or in combination:
TABLE 1 Physical and Performance Requirements for Fabrics
Plain, heat cleaned Glass fiber fabric Glass fiber fabric Fiber fabric coated
A
glass fiber fabric coated with Silicone, for coated with Silicone, with Fluorocarbon
exterior applications for interior applications only
Plain, heat cleaned Glass fiber fabric Glass fiber fabric Glass fiber fabric coated
A
glass fiber fabric coated with silicone rubber, for coated with silicone rubber, with PTFE
exterior applications for interior applications only
Weight (minimum) 17.7 (602) 16.5 (561) 13.5 (455) 15 (510)
oz/sq. yd (g/m )
per Test Methods D3776/
D3776M
Weight (minimum) 17.7 (602) 16.5 (561) 13.5 (455) 16.5 (561)
oz/sq. yd (g/m )
per Test Methods D3776/
D3776M
Breaking Strength (minimum) Warp 200 (35.7) Warp 225 (40.19) Warp 125 (22.4) Warp 225 (40.19)
lb/inch (kg/cm) per Fill 100 (17.9) Fill 175 (31.26) Fill 100 (17.9) Fill 175 (31.26)
Test Methods D5034
or D5035
A
Tear Strength lb (kg) See Warp 40 (18.14) Warp 30 (13.6) Warp 40 (18.14)
per Test Method D5587 Fill 25 (11.33) Fill 20 (9.1) Fill 25 (11.33)
A
Tearing Strength (minimum) lb See Warp 40 (18.14) Warp 30 (13.6) Warp 40 (18.14)
(kg) Fill 25 (11.33) Fill 20 (9.1) Fill 25 (11.33)
per Test Method D5587
Burst Strength (minimum) psi
(kg/cm )
Not Applicable 200 (14) 150 (9.77) 200 (14)
per Test Method D3786/
D3786M
A
Abrasion Resistance See CS-10 Wheel, 500 g loads CS-10 Wheel, 500 g loads CS-10 Wheel, 500 g loads
per Test Method D3389 500 revs, 15 % weight loss 500 revs, 15 % weight loss 500 revs, 15 % weight loss max
max max
Color beige Gray – Other colors are accept- Optional Gray – Other colors are accept-
able that meet buyer’s color able that meet buyer’s color
needs needs
Color beige Gray – Other colors are accept- Gray – Other colors are accept- Gray – Other colors are accept-
able that meet buyer’s color able that meet buyer’s color able that meet buyer’s color
needs needs needs
A
Flame Resistance See Char Length 1 in. max. Char Length 1 in. max. Char Length 1 in. max.
Test Method D6413/D6413M (25.4 cm) (25.4 cm) (25.4 cm)
Afterglow 3 seconds max. Afterglow 3 seconds max. Afterglow 3 seconds max.
Flame out 1 second max. Flame out 1 second max. Flame out 1 second max.
A
Meets MIL-C-20079H, Type 1, Class 9.
C1695 − 22
4.3.1.1 a plain, heat cleaned, glass fiber fabric,
4.3.1.2 a Type 304 stainless steel wire knitted mesh made from 0.008 in. (0.20 mm) diameter wire with nominal 6 to 8 openings
per inch (25.4 mm).
4.3.2 For surfaces from 501°F (261°C) to 1000°F (538°C) exceeding the Surface Temperature Limits of either glass fiber fabric
coated with Silicone rubber or PTFE and where leaks of process fluids are expected, such as flange pairs and valves, the inner layer
and gussets shall be as specified in 4.3.1 and 4.3.1.1 above but also with Type 304 stainless steel foil that has a minimum thickness
of 0.001 in. (0.025 mm). This foil shall be placed on the inner, hot surface between the insulation material and the inner surface
fabric or wire mesh.hot surface and the insulation material.
4.4 All hardware such as D-rings, buckles, tags, quilting pins, lacing hooks and insulation anchors, etc. shall be made of Type 304
stainless steel. Where lacing hooks and lacing anchors are used, they shall be 12 or 14 Gauge.
4.5 Tie-Down Straps:
4.5.1 Industrial Applications and Outdoor Commercial Applications—These tie-down straps shall be constructed of one of the
following three types of material: (the 1) the same material as the outer jacket, (2) a woven glass fiber fabric, or (3) a tape of
suitable thickness with the same coating as the outer jacket material. If the same material as the outer jacket is used, then jacket
with a double thickness is required with and an edge trim sewn in place along both edges.
4.5.2 Indoor Commercial Applications Only—These tie-down straps shall be constructed either of the same materials as for
Outdoor Applications, applications specified in 4.5.1, or of a stand-alone hook and loop fastener materialmaterials with a minimum
upper service temperature
...