ASTM F955-15

Standard Test Method for Evaluating Heat Transfer through Materials for Protective Clothing Upon Contact with Molten Substances

SIGNIFICANCE AND USE
5.1 Workers who have the potential to be exposed to molten metal contact shall be permitted to wear protective clothing using materials that have been evaluated for heat transfer using this test method.  
5.2 This test method rates materials, that are intended for primary protective clothing against potential molten substance contact, for their thermal insulating properties and their reaction to the test exposure.  
5.3 The protective performance, as determined by this test method, will relate to the actual end-use performance only to the degree that the end-use exposure is identical to the exposure used in the test method.  
5.4 Visual inspection of the specimen subjectively notes the material's resistance to molten substance contact.
SCOPE
1.1 This test method covers the evaluation of materials' thermal resistance to heat transfer when exposed to a molten substance pour.  
1.1.1 This test method was validated using molten substances of aluminum, brass, and iron. The test shall be permitted to be adapted for use with other substances.  
1.2 This test method is applicable to materials from which finished primary protective apparel articles are made.  
1.3 This test method does not measure the flammability of materials, nor is it intended for use in evaluating materials exposed to any other thermal exposure.  
1.4 Use this test method to measure and describe the properties of materials, products, or assemblies in response to molten substance pour under controlled laboratory conditions and shall not be used to describe or appraise the thermal hazard or fire risk of materials, products, or assemblies under actual conditions. However, it is acceptable to use results of this test as elements of a thermal risk assessment which takes into account all the factors that are pertinent to an assessment of the thermal hazard of a particular end use.  
1.5 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. Specific hazard statements are given in Section 8.

General Information

• Status: Historical
• Publication Date: 30-Jun-2015
• ICS: 13.340.10 - Protective clothing
• Technical Committee: F23 - Personal Protective Clothing and Equipment
• Drafting Committee: F23.80 - Flame and Thermal

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F955 − 15
Standard Test Method for
Evaluating Heat Transfer Through Materials for Protective
1
Clothing Upon Contact with Molten Substances
ThisstandardisissuedunderthefixeddesignationF955;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This test method covers the evaluation of materials’
D123 Terminology Relating to Textiles
thermal resistance to heat transfer when exposed to a molten
E457 Test Method for Measuring Heat-Transfer Rate Using
substance pour.
a Thermal Capacitance (Slug) Calorimeter
1.1.1 This test method was validated using molten sub-
F1002 Performance Specification for Protective Clothing
stances of aluminum, brass, and iron. The test shall be
and Materials for Use by Workers Exposed to Specific
permitted to be adapted for use with other substances.
Molten Substances and Related Thermal Hazards
1.2 This test method is applicable to materials from which
F1494 Terminology Relating to Protective Clothing
finished primary protective apparel articles are made.
3. Terminology
1.3 This test method does not measure the flammability of
3.1 Definitions of Terms Specific to This Standard:
materials, nor is it intended for use in evaluating materials
3.1.1 break-open—in testing thermal protective material, a
exposed to any other thermal exposure.
response evidenced by the formation of a hole in the material
1.4 Use this test method to measure and describe the
which allows the molten substance to pass through the mate-
properties of materials, products, or assemblies in response to
rial.
molten substance pour under controlled laboratory conditions
3.1.2 charring—the formation of carbonaceous residue as
and shall not be used to describe or appraise the thermal hazard
the result of pyrolysis or incomplete combustion.
or fire risk of materials, products, or assemblies under actual
3.1.3 dripping—a material response evidenced by flowing
conditions. However, it is acceptable to use results of this test
of the polymer.
as elements of a thermal risk assessment which takes into
account all the factors that are pertinent to an assessment of the 3.1.4 embrittlement—the formation of a brittle residue as
thermal hazard of a particular end use.
the result of pyrolysis or incomplete combustion.
3.1.5 heat flux—the thermal intensity indicated by the
1.5 This standard does not purport to address all of the
2
amount of energy transmitted divided by area and time, W/m
safety concerns, if any, associated with its use. It is the
2
(cal/cm s).
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3.1.6 human tissue burn tolerance (heat tolerance)—in the
bility of regulatory limitations prior to use. Specific hazard
testing of thermal protective materials, the amount of thermal
statements are given in Section 8.
energy predicted to cause a second-degree burn injury in
1.6 This international standard was developed in accor- human tissue.
dance with internationally recognized principles on standard-
3.1.7 ignition—the initiation of combustion.
ization established in the Decision on Principles for the
3.1.8 melting—a material response evidenced by softening
Development of International Standards, Guides and Recom-
of the polymer.
mendations issued by the World Trade Organization Technical
3.1.9 primary protective clothing—protective clothing de-
Barriers to Trade (TBT) Committee.
signed to be worn for work activities during which significant
exposure to molten substance splash, radiant heat, and flame is
likely to occur.
1
This test method is under the jurisdiction ofASTM Committee F23 on Personal
Protective Clothing and Equipment and is the direct responsibility of Subcommittee
2
F23.80 on Flame and Thermal. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved July 1, 2015. Published July 2015. Originally approved contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
in1985.Lastpreviouseditionapprovedin2007asF955 – 07.DOI:10.1520/F0955- Standards volume information, refer to the standard’s Document Summary page on
15. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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F955 − 15
3.1.9.1 Discussion—Primary protective clothing is used in 5. Significance and Use
work activities that include charging, tapping, and pouring,
5.1 Workers who have the potential to be exposed to molten
during which work is ca
...

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.
´1
Designation: F955 − 07 F955 − 15
Standard Test Method for
Evaluating Heat Transfer through Materials for Protective
1
Clothing Upon Contact with Molten Substances
This standard is issued under the fixed designation F955; 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
ε NOTE—Editorially corrected 11.1.3 and 11.1.4.3 in February 2015.
1. Scope
1.1 This test method covers the evaluation of materials’ thermal resistance to molten substance pour by describing means of
measuring heat transfer. heat transfer when exposed to a molten substance pour.
NOTE 1—As used in this test method, the term molten substance refers to the three compositions (aluminum, brass, and iron) for which the procedure
was validated. The test design may be adapted for use with other substances not validated as part of the test method.
1.1.1 This test method was validated using molten substances of aluminum, brass, and iron. The test shall be permitted to be
adapted for use with other substances.
1.2 This test method is applicable to materials from which finished primary protective apparel articles are made.
1.3 This test method does not measure the flammability of materials, nor is it intended for use in evaluating materials exposed
to any other thermal exposure exclusive of the molten substance itself (see exposure.Note 1).
1.4 This Use this test method should be used to measure and describe the properties of materials, products, or assemblies in
response to molten substance pour under controlled laboratory conditions and shouldshall not be used to describe or appraise the
thermal hazard or fire risk of materials, products, or assemblies under actual conditions. However, it is acceptable to use results
of this test may be used as elements of a thermal risk assessment which takes into account all the factors that are pertinent to an
assessment of the thermal hazard of a particular end use.
1.5 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. Specific hazard statements are given in Section 8.
2. Referenced Documents
2
2.1 ASTM Standards:
D123 Terminology Relating to Textiles
E457 Test Method for Measuring Heat-Transfer Rate Using a Thermal Capacitance (Slug) Calorimeter
F1002 Performance Specification for Protective Clothing and Materials for Use by Workers Exposed to Specific Molten
Substances and Related Thermal Hazards
F1494 Terminology Relating to Protective Clothing
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 break-open—in testing thermal protective material, a response evidenced by the formation of a hole in the material which
allows the molten substance to pass through the material.
3.1.2 charring—the formation of carbonaceous residue as the result of pyrolysis or incomplete combustion.
3.1.3 dripping—a material response evidenced by flowing of the polymer.
1
This test method is under the jurisdiction of ASTM Committee F23 on Personal Protective Clothing and Equipment and is the direct responsibility of Subcommittee
F23.80 on Flame and Thermal.
Current edition approved Feb. 1, 2007July 1, 2015. Published February 2007July 2015. Originally approved in 1985. Last previous edition approved in 20032007 as
F955 – 03.F955 – 07. DOI: 10.1520/F0955-07E0110.1520/F0955-15.
2
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
1

---------------------- Page: 1 ----------------------
F955 − 15
3.1.4 embrittlement—the formation of a brittle residue as the result of pyrolysis or incomplete combustion.
2 2
3.1.5 heat flux—the thermal intensity indicated by the amount of energy transmitted divided by area and time, W/m (cal/cm
s).
3.1.6 human tissue burn tolerance (heat tolerance)—in the testing of thermal protective materials, the amount of thermal energy
predicted to cause a second-degree burn injury in huma
...