Standard Practice for Determining Physical Properties of Fabrics, Yarns, and Sewing Thread Used in Inflatable Restraints

SCOPE
1.1 This standard is a listing of the test methods commonly employed in determining the physical properties of fabrics and yarns used in the manufacture of inflatable restraints.
1.2 Fabrics used in the manufacture of inflatable restraints may be coated or uncoated, and may be comprised of spun yarns, continuous filament yarns, or a combination thereof.
1.3 Fabrics used in the manufacturer of inflatable restraints may be either flat or one piece woven. For the one-piece woven, follow the sampling section of D 5446 and the individual test method.
1.4 In Section 9, this standard lists is alphabetical order the procedures associated with conducting physical testing of the following fabric or yarn properties of concern to the design and manufacture of inflatable restraints.YarnSectionDenier (Yarn Number)9.3.1Fiber Content9.3.2Finish (Extractable Material)9.3.3Strength and Elongation9.3.4Twist9.3.5FabricAir Permeability9.3.6Abrasion Resistance9.3.7Blocking9.3.8Bow and Skew9.3.9Breaking Force Elongation9.3.10Burst Strength9.3.11Coating Adhesion9.3.12Coating Weight9.3.13Count of Woven Fabric9.3.14Dynamic Air Permeability9.3.28Edgecomb Resistance9.3.29Flammability9.3.15Fogging (Volatility)9.3.16Length9.3.17Mass per Unit Area9.3.18Non-Fibrous Material9.3.19Odor9.3.20Packability9.3.30pH9.3.21Stiffness9.3.22Tear Strength9.3.23Thickness9.3.24Warp Size Content Residual Sizing9.3.25Width9.3.26ThreadSewing Thread9.3.27
1.5 This standard may be used in conjunction with Practice D 5427 which prescribes standard practices for the accelerated aging of inflatable restraint fabrics when comparative results of physical properties before and after accelerated aging are required.
1.6 Procedures and apparatus other than those stated in this standard may be used by agreement of purchaser and supplier with the specific deviations from the standard practice acknowledged in the report.
1.7 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system must be used independent of the other.
1.8 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. See Note 3.

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Publication Date
09-Dec-2001
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Designation: D 5446 – 01
Standard Practice for
Determining Physical Properties of Fabrics, Yarns, and
1
Sewing Thread Used in Inflatable Restraints
This standard is issued under the fixed designation D 5446; 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
Warp Size Content & Residual Sizing 9.3.25
Width 9.3.26
1.1 This standard is a listing of the test methods commonly
Thread
employed in determining the physical properties of fabrics and Sewing Thread 9.3.27
yarns used in the manufacture of inflatable restraints.
1.5 This standard may be used in conjunction with Practice
1.2 Fabrics used in the manufacture of inflatable restraints
D 5427 which prescribes standard practices for the accelerated
may be coated or uncoated, and may be comprised of spun
aging of inflatable restraint fabrics when comparative results of
yarns, continuous filament yarns, or a combination thereof.
physical properties before and after accelerated aging are
1.3 Fabrics used in the manufacturer of inflatable restraints
required.
may be either flat or one piece woven. For the one-piece
1.6 Procedures and apparatus other than those stated in this
woven, follow the sampling section of D 5446 and the indi-
standard may be used by agreement of purchaser and supplier
vidual test method.
with the specific deviations from the standard practice ac-
1.4 In Section 9, this standard lists is alphabetical order the
knowledged in the report.
procedures associated with conducting physical testing of the
1.7 The values stated in either SI units or inch-pound units
following fabric or yarn properties of concern to the design and
are to be regarded separately as standard. The values stated in
manufacture of inflatable restraints.
each system are not exact equivalents; therefore, each system
Yarn Section
must be used independent of the other.
Denier (Yarn Number) 9.3.1
1.8 This standard does not purport to address all of the
Fiber Content 9.3.2
Finish (Extractable Material) 9.3.3
safety concerns, if any, associated with its use. It is the
Strength and Elongation 9.3.4
responsibility of the user of this standard to establish appro-
Twist 9.3.5
priate safety and health practices and determine the applica-
Fabric
Air Permeability 9.3.6
bility of regulatory limitations prior to use. See Note 3.
Abrasion Resistance 9.3.7
Blocking 9.3.8
2. Referenced Documents
Bow and Skew 9.3.9
Breaking Force & Elongation 9.3.10
2.1 ASTM Standards:
Burst Strength 9.3.11 2
D 123 Terminology Relating to Textiles
Coating Adhesion 9.3.12
2
D 204 Test Methods for Sewing Thread
Coating Weight 9.3.13
2
Count of Woven Fabric 9.3.14
D 276 Test Methods for Identification of Fibers in Textiles
Dynamic Air Permeability 9.3.28 2
D 737 Test Method for Air Permeability of Textile Fabrics
Edgecomb Resistance 9.3.29
3
D 751 Test Methods for Testing Coated Fabric
Flammability 9.3.15
Fogging (Volatility) 9.3.16
D 1059 Test Method for Yarn Number Based on Short-
Length 9.3.17
2
Length Specimens
Mass per Unit Area 9.3.18
2
D 1388 Test Methods for Stiffness of Fabrics
Non-Fibrous Material 9.3.19
Odor 9.3.20
D 1422 Test Method for Twist in Yarns by the Untwist
Packability 9.3.30
2
Retwist Method
pH 9.3.21
D 1423 Test Method for Twist in Yarns by Direct Count
Stiffness 9.3.22
2
Tear Strength 9.3.23
Method
Thickness 9.3.24
D 1777 Test Method for Measuring Thickness of Textile
2
Materials
D 1907 Test Method for Yarn Number by the Skein
1
2
These test methods are under the jurisdiction of ASTM Committee D13 on
Method
Textiles and is the direct responsibility of Subcommittee D13.20 on Inflatable
Restraints.
2
Current edition approved December 10, 2001. Published December 2001. Annual Book of ASTM Standards, Vol 07.01
3
Originally published as D 5446 – 93. Last previous edition D 5446 – 99. Annual Book of ASTM Standards, Vol 09.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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D 5446
D 2256 Test Method for Tensile Properties of Yarns by the Method 81 pH of Water—Extract from Wet Processed
2
Single Strand Method Textiles
2
D 2257 Test Method for Extractable Matter in Textiles
3. Terminology
D 2261 Test Method for Tearing Strength of Woven Fabrics
3.1 Definitions:
by the Tongue (Single Rip) Method (Constant-Rate-of-
2
Extension Tensile Testing Machine) 3.1.1 coated fabric, n—a flexible material composed of a
4
textile fabric and an adherent polymeric material applied to one
D 3773 Test Method for Length of Woven Fabric
4
D 3774 Test Method for Width of Woven Fabric or both sides.
4
3.1.2 inflatable restraint, n—a vehicular safety device de-
D 3775 Test Method for Fabric Count of Woven Fabric
D 3776 Test Method for Mass Per Unit Area
...

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