ASTM C533-95(2001)

Standard Specification for Calcium Silicate Block and Pipe Thermal Insulation

SCOPE
1.1 This specification covers calcium silicate block and pipe thermal insulation for use on surfaces with temperatures between 80 and 1700oF (27 to 927oC), unless otherwise agreed upon between the manufacturer and the purchaser.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 The following safety hazards caveat pertains only to the test method (Section 12) described in this specification: 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Dec-2000
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.20 - Homogeneous Inorganic Thermal Insulations

Relations

• Replaces: ASTM C533-95 - Standard Specification for Calcium Silicate Block and Pipe Thermal Insulation
• Effective Date: 01-Jan-2001
• Replaced By: ASTM C533-03 - Standard Specification for Calcium Silicate Block and Pipe Thermal Insulation
• Effective Date: 01-Nov-2003
• Referred By: ASTM F683-23 - Standard Practice for Selection and Application of Thermal Insulation for Piping and Machinery
• Effective Date: 01-Jan-2001
• Referred By: ASTM C1558-19 - Standard Guide for Development of Standard Data Records for Computerization of Thermal Transmission Test Data for Thermal Insulation
• Effective Date: 01-Jan-2001
• Referred By: ASTM C419-20 - Standard Practice for Making and Curing Test Specimens of Mastic Thermal Insulation Coatings
• Effective Date: 01-Jan-2001
• Referred By: ASTM C1696-20 - Standard Guide for Industrial Thermal Insulation Systems
• Effective Date: 01-Jan-2001

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 533 – 95 (Reapproved 2001)
Standard Specification for
Calcium Silicate Block and Pipe Thermal Insulation
This standard is issued under the fixed designation C 533; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope Temperature Thermal Insulation
C 421 Test Method for Tumbling Friability of Preformed
1.1 This specification covers calcium silicate block and pipe
Block-Type Thermal Insulation
thermal insulation for use on surfaces with temperatures
C 446 Test Method for Breaking Load and Calculated
between 80 and 1700°F (27 to 927°C), unless otherwise agreed
Modulus of Rupture of Preformed Insulation for Pipes
upon between the manufacturer and the purchaser.
C 450 Practice for Prefabrication and Field Fabrication of
1.2 The values stated in inch-pound units are to be regarded
Thermal Insulating Fitting Covers for NPS Piping, Vessel
as the standard. The values given in parentheses are for
Lagging, and Dished Head Segments
information only.
C 518 Test Method for Steady-State Heat Flux Measure-
1.3 The following safety hazards caveat pertains only to the
ments and Thermal Transmission Properties by Means of
test method (Section 12) described in this specification: This
the Heat Flow Meter Apparatus
standard does not purport to address all of the safety concerns,
C 585 Practice for Inner and Outer Diameters of Rigid
if any, associated with its use. It is the responsibility of the user
Thermal Insulation for Nominal Sizes of Pipe and Tubing
of this standard to establish appropriate safety and health
(NPS System)
practices and determine the applicability of regulatory limita-
C 795 Specification for Thermal Insulation for Use In
tions prior to use.
Contact with Austenitic Stainless Steel
2. Referenced Documents C 870 Practice for Conditioning of Thermal Insulating Ma-
terials
2.1 ASTM Standards:
C 1045 Practice for Calculating Thermal Transmission
C 165 Test Method for Measuring Compressive Properties
Properties From Steady-State Heat Flux Measurements
of Thermal Insulations
C 1058 Practice for Selecting Temperatures for Evaluating
C 168 Terminology Relating to Thermal Insulation Materi-
and Reporting Thermal Properties of Thermal Insulation
als
C 1114 Test Method for Steady-State Thermal Transmission
C 177 Test Method for Steady-State Heat Flux Measure-
Properties by Means of the Thin-Heater Apparatus
ments and Thermal Transmission Properties by Means of
E 84 Test Method for Surface Burning Characteristics of
the Guarded-Hot-Plate Apparatus
Building Materials
C 203 Test Methods for Breaking Load and Flexural Prop-
erties of Block-Type Thermal Insulation
3. Terminology
C 302 Test Method for Density and Dimensions of Pre-
3.1 Definitions—For definitions used in this specification,
formed Pipe-Covering-Type Thermal Insulation
see Terminology C 168.
C 303 Test Method for Dimensions and Density of Pre-
formed Block-Type Thermal Insulation
4. Classification
C 335 Test Method for Steady-State Heat Transfer Proper-
2 4.1 Thermal insulation shall be of the following types:
ties of Horizontal Pipe Insulation
4.1.1 Type I—For use on surfaces at temperature to 1200°F
C 356 Test Method for Linear Shrinkage of Preformed
(649°C).
High-Temperature Thermal Insulation Subjected to Soak-
2 4.1.2 Type II—For use on surfaces at temperatures up to
ing Heat
1700°F (927°C).
C 390 Criteria for Sampling and Acceptance of Preformed
Thermal Insulation Lots
5. Description
C 411 Test Method for Hot-Surface Performance of High-
5.1 Composition—Calcium silicate thermal insulation shall
consist principally of hydrous calcium silicate usually with the
incorporation of fibrous reinforcement. Asbestos shall not be
This specification is under the jurisdiction of ASTM Committee C16 on
Thermal Insulation and is the direct responsibility of Subcommittee C16.20 on
used as a component in the manufacture of the material.
Homogeneous Inorganic Thermal Insulations.
Current edition approved Aug. 15, 1995. Published October 1995. Originally
issued in 1964 to replace C 344 and C 345. Last previous edition C 533 – 85 (1990).
2 3
Annual Book of ASTM Standards, Vol 04.06. Annual Book of ASTM Standards, Vol 04.07.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
C 533
TABLE 1 Physical Requirements
lengths of 36 in. (914 mm), widths of 12 or 18 in. (305 or 458
mm), and thicknesses from 1 to 6 in. (25 to 152 mm) in ⁄2-in.
NOTE 1—The physical requirements are based on the properties of
(13-mm) increments. Size and spacing of grooves shall be as
samples dried or conditioned, or both, as specified in the referenced test
methods. Calcium silicate insulation tends to absorb moisture to varying specified by the manufacturer. Long edges of grooved block
degrees depending on exposure conditions. It can absorb up to 4 times its
may be furnished beveled as specified by the manufacturer.
dry weight if placed in direct contact with water through improper storage
6.2 Calcium Silicate Pipe Insulation—Calcium silicate pipe
or application.
insulation shall be supplied either as hollow cylindrical shapes
NOTE 2—The user is advised that some applications could require the
split in half lengthwise (in a plane including the cylindrical
knowledge of the thermal conductivity of the insulation material at mean
axis) or as curved segments. The pipe insulation shall be
temperatures above those shown. Consult the manufacturer for data at
mean temperatures exceeding those listed.
furnished in sections or segments in a length of 36 in. (914
mm) to fit standard sizes of pipe and tubing, and in nominal
Type I Type II
wall thicknesses from 1 to 6 in. (25 to 152 mm), in ⁄2 in. (13
Use temperature, max, °F (°C) 1200 (649) 1700 (927)
3 3
Density (dry), max, lb/ft (kg/m ) 15 (240) 22 (352) mm) increments. Thicknesses greater than 3 in. (76 mm) may
Flexural strength, min, psi (kPa) 50 (344) 50 (344)
be furnished in two or more layers. Inner and outer diameters
Compressive strength, min, at 5 % deformation, 100 (688) 100 (688)
shall be in accordance with those standard dimensions speci-
psi (kPa)
Mass loss by tumbling, max, %
fied in Practice C 585.
after first 10 minutes 20 20
after second 10 minutes 40 40
NOTE 1—Molded fitting insulation, which satisfies Practice C 450, may
Soaking heat linear shrinkage, max,% 2 2
be available for some size/thickness combinations of certain fitting types,
Hot surface performance:
as specified by the manufacturer. When multilayer sectional pipe insula-
1 1
warpage, max, in. (mm) ⁄4 (6) ⁄4 (6)
tion is required, it is necessary to consider the inside and outside diameters
cracking No cracks completely
of each layer to ensure proper nesting of materials when installed.
through the insulation thick-
ness. Surface cracks on hot
Necessity of furnishing multilayer pipe insulation nested from the
face are acceptable
manufacturer shall be based on manufacturer’s ability to control outside
A
Apparent thermal conductivity (see Note 2)
diameters on inner layers to not greater than inside diameters, at minus
Btu-in./h-ft -°F (W/m-K)max at mean
tolerances, of nesting outer layer under normal production, as agreed to
temperature of:
between purchaser and manufacturer.
200°F (93°C) 0.45 (0.065) 0.54 (0.078)
300°F (149°C) 0.50 (0.072) 0.58 (0.084)
400°F (204°C) 0.55 (0.079) 0.61 (0.088)
7. Dimensional Tolerances
500°F (260°C) 0.60 (0.087) 0.64 (0.092)
600°F (316°C) 0.66 (0.095) 0.67 (0.097)
7.1 General—The average tolerances for length, width, and
700°F (371°C) 0.71 (0.102) 0.70 (0.101)
thickness shall be as following:
800°F (427°C) . 0.73 (0.105)
Block Pipe
900°F (482°C) . 0.75 (0.108)
1 1
Length 6 ⁄8 in. (3 mm) 6 ⁄8 in. (3 mm)
1000°F (538°C) . 0.77 (0.111)
Width 6 ⁄8 in. (3 mm)
Surface burning characteristics:
Thickness 6 ⁄8 in. (3 mm)
Flame spread index, max 0 0
Inner Diameter in accordance with Practice C 585
Smoke density index, max 0 0
Outer Diameter in accordance with Practice C 585
As shipped moisture content, by weight, max % 20 20
A
The thermal transmission properties of calcium silicate block and pipe
7.2 Pipe Insulation—The following additional dimensional
insulation may vary with temperature, temperature gradient, moisture content,
tolerances apply only to calcium silicate pipe insulation sup-
thickness, and shape. Note that the apparent thermal conductivity requirements in
the table are based on samples tested under the conditions specified in 12.1.2.
plied as half sections.
These are comparative values for establishing specification compliance. They may
7.2.1 Fit and Closure—When fitted to the appropriate size
not represent the installed performance of the insulation under use conditions
differing substantially from the test conditions. pipe by banding on 9-in. (229-mm) centers, the longitudinal
seams on both sides of the pipe insulation shall close to within
⁄16 in. (2 mm) along the entire length of the section.
6. Standard Shapes, Sizes, and Dimensions
7.2.2 Concentricity—The inner bore of the pipe insulation
6.1 Calcium silicate block-type thermal insulation shall be
shall be concentric with the outer cylindrical surface. The
supplied in the form of flat or curved blocks as specified.
deviation from concentricity shall not exceed ⁄8 in. (3 mm) or
Standard sizes of the block type insulation shall be as follows:
5 % of the wall thickness, whichever is greater.
6.1.1 Flat Block—Flat block shall be furnished in lengths of
7.2.3 Half-Section Balan
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