ASTM D5431-08

1.1 This specification covers the evaluation of specific performance characteristics of importance in woven and knit flat, fitted, and waterbed sheet products for use in institutional and household environments.

1.2 This specification may be used by mutual agreement between the purchaser and the supplier to establish purchasing specification requirements.

1.3 The requirements in Table 1 apply to the length and width directions for those properties where fabric direction is pertinent.

1.4 This specification is not applicable to woven and knit products used for sheet blankets or to woven and knitted sheet products used for apparel.

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.

TABLE 1 Specification Requirements

Characteristics			Requirements
			Woven
			Non-flannel		Flannel	Knitted	Section
			Polyester/Cotton	100 % Cotton		Flannel/Non-flannel
Breaking Force							7.1
	CRT   Method Each DirectionA		222 N   (50 lbf) min	178 N   (40 lbf) min	156 N (35 lbf) min
Bursting ForceA						222 N (50 lbf) min	7.1.2
Tear Resistance, ElmendorfA							7.1.3
	Each   Direction		7 N (1.5 lbf) min	7 N (1.5 lbf) min	7 N (1.5 lbf) min
Pilling			4.0	NA	NA	4.0	7.1.4
Dimensional Change:							7.1.5
	Durable Press (In Each Direction)		5 % max	5 % max	3.5 % max	4 % max
	Nondurable Press (Nonpreshrunk)
		Length	8 % max	8 % max	8 % max
		Width	6 % max	6 % max	6 % max
	Preshrunk (In Each   Direction)		2 % max	3 % max	3.5 % max
Laundered Appearance			Acceptable	Acceptable	Acceptable	Acceptable	7.2.1
Fabric Appearance			SA 3.0 min	SA 2.2 minB	NA	SA 3.0 min	7.1.6
Bow and Skewness			3 % max	3 % max	3 % max	3 % max	7.1.7
Colorfastness To:C
	Laundering:						7.1.8.1
		Alteration in   Shade	Class 4 minD	Class 4 minD	Class 4 minD	Class 4 minD
		Staining	Class 3 minE	Class 3 minE	Class 3 minE	Class 3 minE
Crocking:							7.1.8.2
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