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ASTM D3955-20

(Specification)

Standard Specification for Electrical Insulating Varnishes

Standard Specification for Electrical Insulating Varnishes

ABSTRACT
This specification covers the tests and values for electrical insulating varnishes, as supplied, which are suitable for the impregnation and treatment of electrical coils and windings applied by dip process. The varnishes are classified according to grades: Grade DA; Grade DO; Grade DM; Grade DS; Grade DW; and Grade DT. This specification covers both flexible and rigid, solvent and solventless insulating varnishes. The insulating varnishes are classified according to thermal classes: Class 130; Class 155; Class 180; Class 200; and Class 220. Quality conformance tests shall be performed to conform to the specified requirements.
SCOPE
1.1 This specification covers the tests and values for electrical insulating varnishes, as supplied, which are suitable for the impregnation and treatment of electrical coils and windings applied by dip process.  
1.2 Varnishes, flexible or rigid, included in this specification are:
Grade DA—Air-dry
Grade DO—Organic solvent containing, baking,
Grade DM—Reactive diluent containing,  
Grade DS—Silicone,
Grade DW—Water containing, and
Grade DT—Thixotropic.  
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.
Note 1: This specification resembles IEC 60455 in title only. The content is significantly different.  
1.4 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
31-Jul-2020
ICS
29.035.60 - Varnished fabrics
Technical Committee
D09 - Electrical and Electronic Insulating Materials
Drafting Committee
D09.01 - Electrical Insulating Products
Current Stage
Ref Project

Relations

Refers
ASTM D93-20 - Standard Test Methods for Flash Point by Pensky-Martens Closed Cup Tester
Effective Date
01-Aug-2020
Refers
ASTM D3145-20 - Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by Helical Coil Method
Effective Date
01-Aug-2020

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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:D3955 −20
Standard Specification for
1
Electrical Insulating Varnishes
This standard is issued under the fixed designation D3955; 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* D2519 Test Method for Bond Strength of Electrical Insulat-
ing Varnishes by the Helical Coil Test
1.1 This specification covers the tests and values for elec-
D3056 Test Method for Gel Time of Solventless Varnishes
trical insulating varnishes, as supplied, which are suitable for
D3145 Test Method for Thermal Endurance of Electrical
the impregnation and treatment of electrical coils and windings
Insulating Varnishes by the Helical Coil Method
applied by dip process.
D3251 Test Method for Thermal Endurance Characteristics
1.2 Varnishes, flexible or rigid, included in this specification
of Electrical Insulating Varnishes Applied Over Film-
are:
Insulated Magnet Wire
Grade DA—Air-dry
D3278 Test Methods for Flash Point of Liquids by Small
Grade DO—Organic solvent containing, baking,
Scale Closed-Cup Apparatus
Grade DM—Reactive diluent containing,
D4733 Test Methods for Solventless Electrical Insulating
Grade DS—Silicone,
Varnishes
Grade DW—Water containing, and
D4880 Test Method for Salt Water Proofness of Insulating
Grade DT—Thixotropic.
Varnishes Over Enamelled Magnet Wire
1.3 The values stated in inch-pound units are to be regarded D5637 Test Method for Moisture Resistance of Electrical
Insulating Varnishes
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only D5638 Test Method for Chemical Resistance of Electrical
Insulating Varnishes
and are not considered standard.
3
2.2 Military Specifications:
NOTE 1—This specification resembles IEC 60455 in title only. The
MIL-PRF-17672 Hydraulic Fluid, Petroleum, Inhibited
content is significantly different.
MIL-PRF-17331 Lubricating Oil, Synthetic Base P-D-680,
1.4 This international standard was developed in accor-
Dry Cleaning Solvent
dance with internationally recognized principles on standard-
MIL-D-16791 Detergent, General Purpose, (Liquid, Non-
ization established in the Decision on Principles for the
Ionic)
Development of International Standards, Guides and Recom-
3
2.3 Other Standards:
mendations issued by the World Trade Organization Technical
NEMA MW1000 Magnet Wire
Barriers to Trade (TBT) Committee.
IEC 60455 Resin Based Reactive Compounds Used for
2. Referenced Documents
Electrical Insulation
2
2.1 ASTM Standards:
3. Terminology
D93 Test Methods for Flash Point by Pensky-Martens
Closed Cup Tester 3.1 Definitions:
D115 Test Methods for Testing Solvent Containing Var- 3.1.1 For definitions of terms used in this specification refer
nishes Used for Electrical Insulation to Terminology D1711.
D1711 Terminology Relating to Electrical Insulation 3.1.2 varnish, electrical insulating, n—a liquid resin system
that is applied to and cured on electrical components providing
electrical, mechanical, and environmental protection.
1
This specification is under the jurisdiction of ASTM Committee D09 on
3.1.2.1 Discussion—There are two types of electrical insu-
Electrical and Electronic Insulating Materials and is the direct responsibility of
lating varnish: solvent-containing and solventless.The solvent-
Subcommittee D09.01 on Electrical Insulating Products.
Current edition approved Aug. 1, 2020. Published September 2020. Originally containing varnish is a solution, dispersion, or emulsion of a
approved in 1980. Last previous edition approved in 2013 as D3955 – 13. DOI:
polymer or mixture of polymers in a volatile, nonreactable
10.1520/D3955-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available from Global Engineering Documents, 15 Inverness Way, East
the ASTM website. Englewood, CO 80112-5704, http://www.global.ihs.com.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3955−20
liquid. The solventless type is a liquid resin system free of be performed in accordance with the appropriate methods, and
volatile, nonreactable solvents. limits as shown in Table 1.
6.8 Preconditioning:
...

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: D3955 − 13 D3955 − 20
Standard Specification for
1
Electrical Insulating Varnishes
This standard is issued under the fixed designation D3955; 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 covers the tests and values for electrical insulating varnishes, as supplied, which are suitable for the
impregnation and treatment of electrical coils and windings applied by dip process.
1.2 Varnishes, flexible or rigid, included in this specification are:
Grade DA—Air-dry
Grade DO—Organic solvent containing, baking,
Grade DM—Reactive diluent containing,
Grade DS—Silicone,
Grade DW—Water containing, and
Grade DT—Thixotropic.
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.
NOTE 1—This specification resembles IEC 60455 in title only. The content is significantly different.
1.4 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
2.1 ASTM Standards:
D93 Test Methods for Flash Point by Pensky-Martens Closed Cup Tester
D115 Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation
D2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
D3056 Test Method for Gel Time of Solventless Varnishes
D3145 Test Method for Thermal Endurance of Electrical Insulating Varnishes by Helical Coil Method
D3251 Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated
Magnet Wire
1
This specification is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee
D09.01 on Electrical Insulating Varnishes, Powders and Encapsulating CompoundsProducts.
Current edition approved April 1, 2013Aug. 1, 2020. Published April 2013September 2020. Originally approved in 1980. Last previous edition approved in 20092013 as
D3955–04 (2009). – 13. DOI: 10.1520/D3955-13.10.1520/D3955-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3955 − 20
D3278 Test Methods for Flash Point of Liquids by Small Scale Closed-Cup Apparatus
D4733 Test Methods for Solventless Electrical Insulating Varnishes
D4880 Test Method for Salt Water Proofness of Insulating Varnishes Over Enamelled Magnet Wire
D5637 Test Method for Moisture Resistance of Electrical Insulating Varnishes
D5638 Test Method for Chemical Resistance of Electrical Insulating Varnishes
3
2.2 Military Specifications:
MIL-PRF-17672 Hydraulic Fluid, Petroleum, Inhibited
MIL-PRF-17331 Lubricating Oil, Synthetic Base P-D-680, Dry Cleaning Solvent
MIL-D-16791 Detergent, General Purpose, (Liquid, Non-Ionic)
3
2.3 Other Standards:
NEMA MW1000 Magnet Wire
IEC 60455 Resin Based Reactive Compounds Used for Electrical Insulation
3. Terminology
3.1 Definitions—For definitions of terms used in this specification refer to Terminology D1711.
3.1 Definitions:
3.1.1 For definitions of terms used in this specification refer to Terminology D1711.
3.1.2 varnish, electrical insulating, n—a liquid resin system that is applied to and cured on electrical components providing
electrical, mechanical, and environmental protection.
3.1.2.1 Discussion—
There are two types of electrical insulating varnish: solvent-containing and solventless. The solvent-containing varnish is a
solution, dispersion, or emulsion of a polymer or mixture of polymers in a volatile, nonreactable liquid. The solv
...

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5.1 This test method is used to determine the effect of exposure to elevated temperatures on the bond strength of combinations of magnet wire insulations and electrical insulating varnishes. The results are used as a guide for the comparison and selection of varnishes and combinations of varnishes and magnet wire insulation for specific applications. Test Methods D1932 and D3251 describe additional tests for determining the thermal endurance of insulating varnishes. A comprehensive evaluation of thermal characteristics includes a comparison of the thermal endurance determined in these different ways.  
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ASTM
ASTM E2552-23(Guide)
Standard Guide for Assessing the Environmental and Human Health Impacts of New Compounds for Military Use

SIGNIFICANCE AND USE
5.1 The purpose of this guide is to provide a logical, tiered approach in the development of environmental health criteria coincident with level and effort in the research, development, testing, and evaluation of new materials for military use. Various levels of uncertainty are associated with data collected from previous stages. Following the recommendation in the guide should reduce the relative uncertainty of the data collected at each developmental stage. At each stage, a general weight of evidence qualifier shall accompany each exposure/effect relationship. They may be simple (for example, low, medium, or high confidence) or sophisticated using a numerical value for each predictor as a multiplier to ascertain relative confidence in each step of risk characterization. The specific method used will depend on the stage of development, quantity and availability of data, variation in the measurement, and general knowledge of the dataset. Since specific formulations, conditions, and use scenarios may not be known until the later stages, exposure estimates can be determined when practical (for example, Engineering and Manufacturing Development; see 6.6). Exposure data can then be used with other toxicological data collected from previous stages in a quantitative risk assessment to determine the relative degree of hazard.  
5.2 Data developed from the use of this guide are designed to be consistent with criteria required in weapons and weapons system development (for example, programmatic environment, safety and occupational health evaluations, environmental assessments/environmental impact statements, toxicity clearances, and technical data sheets).  
5.3 Information shall be evaluated in a flexible manner consistent with the needs of the authorizing program. This requires proper characterization of the current problem. For example, compounds may be ranked relative to the environmental criteria of the prospective alternatives, the replacement compound, and within bo...
SCOPE
1.1 This guide is intended to determine the relative environmental influence of new substances, consistent with the research and development (R&D) level of effort and is intended to be applied in a logical, tiered manner that parallels both the available funding and the stage of research, development, testing, and evaluation. Specifically, conservative assumptions, relationships, and models are recommended early in the research stage, and as the technology is matured, empirical data will be developed and used. Munition constituents are included and may include propellants, oxidizers, explosives, binders, stabilizers, metals, dyes, and other compounds used in the formulation to produce a desired effect. Munition systems range from projectiles, grenades, rockets/missiles, training simulators, to smokes and obscurants. Given the complexity of issues involved in the assessment of environmental fate and effects and the diversity of the systems used, this guide is broad in scope and not intended to address every factor that may be important in an environmental context. Rather, it is intended to reduce uncertainty at minimal cost by considering the most important factors related to human health and environmental impacts of energetic materials. This guide provides an outline for collecting data useful in a relative ranking procedure to provide the systems scientist with a sound basis for prospectively determining a selection of candidates based on environmental and human health criteria. The general principles in this guide are applicable to substances other than energetics if intended to be used in a similar manner with similar exposure profiles.  
1.2 The scope of this guide includes:  
1.2.1 Energetic and other new/novel materials and compositions in all stages of research, development, test and evaluation.  
1.2.2 Environmental assessment, including:
1.2.2.1 Human and ecological effects of the unexploded energetics and ...

  • Guide
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  • Guide
    9 pages
    English language
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ASTM
ASTM D8042-18(2023)(Test Method)
Test Method for Shrinkage Temperature of Wet Blue and Wet White

SIGNIFICANCE AND USE
5.1 This test method is designed to determine the temperature at which the Wet Blue or Wet White specimen experiences shrinkage. In this test method, shrinkage occurs as a result of hydrothermal denaturation of the collagen protein molecules which make up the fiber structure of the Wet Blue or Wet White. The shrinkage temperature of Wet Blue or Wet White is influenced by many different factors, most of which appear to affect the number and nature of crosslinking interactions between adjacent polypeptide chains of the collagen protein molecules. The value of the shrinkage temperature of Wet Blue or Wet White is commonly used as an indicator of the type of tannage or the degree of tannage, or both, of that particular Wet Blue or Wet White (especially for the more hydrothermally stable tannages such as chrome tannage).
SCOPE
1.1 This test method covers the determination of the shrinkage temperature of all types of Wet Blue and Wet White. The heating medium is water when the shrinkage temperature is at or below 98 °C. The heating medium is a glycerine-water solution when the shrinkage temperature is above 98 °C.  
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.  
1.3 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.  
1.4 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.

  • Standard
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