This specification covers all standard types of felt in the form of rolls and sheets that are suitable for mechanical use. Certain special-purpose felts are also covered. Felts shall be classified according to thickness and mass, properties and general descriptions. Felt classifications shall be based on the Society of Automotive Engineers Specification and the US Department of Defense Federal Specification. Special-purpose felts shall be classified under special-purpose classification. The chemical properties of roll and sheet felt shall conform to the specified requirements. The physical properties of roll and sheet felt such as width, thickness, and mass (weight) per unit area, shall conform to the requirements specified. All the properties, except color, of felt shall be determined in accordance to the test method specified.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This specification covers all standard types of felt in the form of rolls and sheets that are suitable for mechanical use. Certain special-purpose felts are also covered.

1.2 This specification is not applicable to felt-like products that utilize weaving, knitting, stitching, or bonding such as papermaker's felt.

1.3 Trade practice in the felt industry deals in pounds, yards, and inches, therefore the values stated in inch-pound units are to be regarded as standard. The values in SI units are provided as information only.

1.3.1 The specification referenced in 2.2 uses only inch-pound units.he percent specific gravity of that class.

TABLE 1 Wool Sheet Felt: Thickness and Mass (Weight)

ASTM (NTA) Class	Color	Thickness, in.			Thickness, mm			Mass (Weight) lb/yd2		Mass (Weight) kg/m2
		Nominal	Tolerances		Nominal	Tolerances		Nominal	Tolerances	Nominal	Tolerances
			Sheets	Cut Parts		Sheets	Cut Parts
26S1	White	0.125	± 0.014	± 0.016	3.17	± 0.35	± 0.41	1.50	± 0.10	0.81	± 0.05
26S4	Gray	0.188	0.016	0.018	4.78	0.41	0.46	2.25	0.15	1.22	0.08
		0.250	0.020	0.022	6.35	0.51	0.56	3.00	0.20	1.63	0.11
		0.313	0.022	0.024	7.95	0.56	0.61	3.75	0.25	2.04	0.14
		0.375	0.024	0.026	9.52	0.61	0.66	4.50	0.30	2.44	0.16
		0.500	0.030	0.032	12.70	0.76	0.81	6.00	0.40	3.26	0.22
		0.625	0.035	0.037	15.88	0.89	0.94	7.50	0.45	4.07	0.24
		0.750	0.040	0.042	19.05	1.02	1.07	9.00	0.50	4.89	0.27
		0.875	0.046	0.048	22.23	1.17	1.22	10.50	0.55	5.70	0.30
		1.000	0.051	0.053	25.40	1.30	1.35	12.00	0.60	6.52	0.33
		1.250	0.062	0.065	31.75	1.57	1.65	15.00	0.70	8.15	0.38
		1.500	0.072	0.075	38.10	1.83	1.91	18.00	0.80	9.77	0.43
		1.750	0.083	0.085	44.45	2.11	2.16	21.00	0.90	11.40	0.49
		2.000	0.094	0.098	50.80	2.39	2.49	24.00	1.00	13.03	0.54
		2.500	0.115	0.119	63.50	2.92	3.02	30.00	1.05	16.29	0.57
		3.000	0.136	0.141	76.20	3.45	3.58	36.00	1.10	19.55	0.60
34S1	White	0.125	0.012	0.014	3.17	0.30	0.36	2.00	0.10	1.09	0.05
34S2	White	0.188	0.012	0.014	4.78	0.30	0.36	3.00	0.15	1.63	0.08
34S3	White	0.250	0.016	0.018	6.35	0.41	0.46	4.00	0.30	2.17	0.16
34S4	Gray	0.313	0.017	0.019	7.95	0.43	0.48	5.00	0.35	2.71	0.19
		0.375	0.019	0.021	9.52	0.48	0.53	6.00	0.40	3.26	0.22
		0.500	0.022	0.024	12.70	0.56	0.61	8.00	0.50	4.34	0.27
		0.625	0.026	0.028	15.88	0.66	0.71	10.00	0.60	5.43	0.33
		0.750	0.029	0.031	19.05	0.74	0.79	12.00	0.70	6.52	0.38
		0.875	0.032	0.034	22.23	0.87	0.86	14.00	0.75	7.60	0.41
		1.000	0.036	0.038	25.40	0.91	0.97	16.00	0.80	8.69	0.43
		1.250	0.042	0.045	31.25	1.07	1.14	20.00	0.90	10.86	0.49
		1.500	0.049	0.052	38.10	1.24	1.32	24.00	1.00	13.03	0.54
		1.750	0.056	0.059	44.45	1.42	1.50	28.00	1.10	15.20	0.60
		2.000	0.063	0.067	50.80	1.60	1.70	32.00	1.20	17.38	0.65
		2.500	0.076	0.080	63.50	1.93	2.03	40.00	1.25	21.72	0.68
		3.000	0.090	0.095	76.20	2.29	2.41	48.00	1.30	26.06	0.71
43S1	White	0.125	0.012	0.014	3.17	0.30	0.36	2.50	0.30	1.36	0.16
43S2	White	0.188	0.012	0.014	4.78	0.30	0.36	3.75	0.35	2.04	0.19
43S3	White	0.250	0.014	0.016	6.35	0.36	0.41	5.00	0.40	2.71	0.22
43S4	Gray	0.375	0.016	0.019	9.52	0.41	0.48	7.50	0.50	4.07	0.27
		0.500	0.019	0.022	12.70	0.48	0.56	10.00	0.60	5.43	0.33
		0.625	0.022	0.025	15.88	0.56	0.64	12.50	0.70	6.79	0.38
		0.750	0.025	0.028	19.05	0.63	0.71	15.00	0.80	8.15	0.43
		0.875	0.027	0.030	22.23	0.69	0.76	17.50	0.90	9.50	0.49
		1.000	0.030	0.033	25.40	0.76	0.84	20.00	1.00	10.86	0.54
		1.250	0.036	0.040	31.15	0.91	1.02	25.00	1.10	13.56	0.60
		1.500	0.041	0.045	38.10	1.04	1.14	30.00	1.20	16.29	0.65
		1.750	0.047	0.051	44.45	1.19	1.30	35.00	1.30	19.00	0.71
		2.000	0.053	0.058	50.80	1.35	1.47	40.00	1.40	21.72	0.76
		2.500	0.064	0.070	63.50	1.63	1.78	50.00	1.45	27.15	0.79
		3.000	0.075	0.082	76.20	1.90	2.08	60.00	1.50	32.58	0.81
56S1	White	0.125	0.010	0.014	3.17	0.25	0.36	3.25	0.40	1.76	0.22
56S2	White	0.188	0.010	0.014	4.78	0.25	0.36	4.90	0.50	2.66	0.27
56S3	White	0.250	0.011	0.016	6.35	0.28	0.41	6.50	0.60	3.53	0.33
S654	Gray	0.375	0.013	0.018	9.52	0.33	0.46	9.75	0.80	5.29	0.43
		0.500	0.016	0.022	12.70	0.41	0.56	13.00	1.00	7.06	0.54
		0.625	0.018	0.024	15.88	0.46	0.61	16.25	1.10	8.82	0.60
		0.750	0.020	0.026	19.05	0.51	0.66	19.50	1.20	10.59	0.65
		0.875	0.022	0.028	22.23	0.56	0.71	22.75	1.30	12.35	0.70
		1.000	0.025	0.031	25.40	0.63	0.79	26.00	1.40	14.12	0.76
		1.250	0.029	0.036	31.75	0.74	0.91	32.50	1.50	17.65	0.81
		1.500	0.033	0.040	38.10	0.84	1.02	39.00	1.60	21.18	0.87
		1.750	0.038	0.046	44.45	0.97	1.17	45.50	1.70	24.71	0.92
		2.000	0.042	0.051	50.80	1.07	1.30	52.00	1.80	28.24	0.98
		2.500	0.050	0.061	63.50	1.27	1.55	65.00	1.85	35.29	1.00
		3.000	0.058	0.070	76.20	1.47	1.78	78.00	1.90	42.35	1.03
68S1	White	0.125	0.007	0.013	3.17	0.18	0.33	4.00	0.50	2.17	0.27
68S2	White	0.188	0.007	0.014	4.78	0.18	0.36	6.00	0.75	3.26	0.41
68S3	White	0.250	0.007	0.015	D123 Terminology Relating to Textiles D461 Test Methods for Felt D4845 Terminology Relating to Wool Federal Standard C-F-206, Felt Sheet: Cloth Felt, Wool, Pressed Felt Manufacturers Council FS14-68/71 Wool Felt Standard Specifications SAE Standard J314b Felts-Wool and Part Wool Keywords acceptance; conformance; specification; color; mass per unit area; solubility relationships; specific gravity; splitting; tension (tensile) properties/tests; thickness; width; felt; Color--textiles; Felt--specifications; Solubility; Specific gravity; Splitting resistance; Textile fabrics/fibers--specifications; Thickness--textile fabrics/fibers; Wool felt; ICS Code ICS Number Code 59.080.30 (Textile fabrics) DOI: 10.1520/D2475-01R08 ASTM International is a member of CrossRef. ASTM D2475 (Textile Standards) Citing ASTM Standards [Back to Top]