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S.A.E. Felt Specifications

Type I Roll Felt, SAE No. F-1 F-2 F-3
Classification No.. 16R1 16R2 16R3
Wool Content ³% 95 90 85
Chlorothene Solubles £% 2.5 2.5 2.5
Water Solubles £% 2.5 2.5 3.0
Total Solubles £% 3.0 4.0 4.5
Ash Content £% 1.5 2.0 2.5
Tensile Strength ³ psi 500 500 400
Slit Resistance ³ psi 33 28 22
Width = inches 60 or 72 60 or 72 60 or 72
Color White Not gray or black Gray
Thickness vs. basis weight F-1 & F-2 F-3
Thickness (inches) Thickness Range Weight lb/yd² Thickness Range Weight lb/yd²
1/16  0.050 - 0.075  0.95 - 1.05 
1/8  0.113 - 0.137  1.90 - 2.10  0.113 - 0.137  1.90 - 2.10 
3/16  0.175 - 0.201  2.85 - 3.15  0.175 - 0.201  2.85 - 3.15
1/4  0.236 - 0.264  3.80 - 4.20  0.236 - 0.264  3.80 - 4.19
5/16  0.298 - 0.328  4.75 - 5.25  0.298 - 0.328  4.75 - 5.24
3/8  0.359 - 0.391  5.70 - 6.30  0.359 - 0.391  5.70 - 6.29
1/2  0.481 - 0.519  7.60 - 8.40  0.481 - 0.519  7.60 - 8.39
5/8  0.603 - 0.647  9.50 - 10.50  0.603 - 0.647  9.50 - 10.49
3/4  0.725 - 0.775  11.40 - 12.60  0.725 - 0.775  11.40 - 12.59
7/8  0.847 - 0.903  13.30 - 14.70  0.847 - 0.903  13.30 - 14.69
1  0.969 - 1.031  15.20 - 16.80  0.969 - 1.031  15.20 - 16.79
Thickness (inches) Thickness Range Weight lb/yd² Thickness Range Weight lb/yd²

Type I Roll Felt: F-5 to F-7

Type I Roll Felt, SAE No. F-5 F-6 F-7
Classification No. 12R1 12R2 12R3
Wool Content ³% 95 87 80
Chlorothene Solubles £ % 2.5 2.5 4.0
Water Solubles £% 2.5 2.5  4.0
Total Solubles £% 3.0 4.5  7.0
Ash Content £% 2.0 2.5 3.0
Tensile Strength ³ psi 400 275 250
Slit Resistance ³ psi 18 16 12
Width = inches 60 or 72 60 or 72 60 or 72
Color White Gray Gray
Thickness vs. basis weight F-5, F-6 & F-7
Thickness (inches) Thickness Range Weight lb/yd²
1/8  0.111 - 0.139  1.45 - 1.61 
3/16  0.172 - 0.204  2.17 - 2.41 
1/4  0.232 - 0.268  2.90 - 3.22 
5/16  0.293 - 0.333  3.62 - 4.02 
3/8  0.353 - 0.397  4.35 - 4.83 
1/2  0.474 - 0.526  5.80 - 6.80 
5/8  0.595 - 0.655  7.25 - 8.05 
3/4  0.716 - 0.784  8.70 - 9.66 
7/8  0.837 - 0.913  10.15 - 11.27 
1  0.958 - 1.042  11.60 - 12.88 
Thickness (inches) Thickness Range Weight lb/yd²

Type I Roll Felt: F-10 to F-15

Type I Roll Felt, SAE No. F-10 F-11 F-12 F-13 F-15
Classification No. 9R1 9R2 9R3 9R4 9R5
WoolContent ³% 95 87 85 75 55
Chlorothene Solubles £% 2.5 3.0 4.0 4.0 4.0
Water Solubles £% 2.5 2.5 2.5 4.0 5.0
Total Solubles £% 3.0 4.5 6.5 8.0 9.0
Ash Content £% 2.5 3.0 3.5 3.5 4.0
Tensile Strength ³ psi 225 200 100 75 75
Slit Resistance ³ psi 8 6 3 2 2
Width = inches 72 72 72 72 72
Color White Gray Gray Gray Gray
Thickness vs. basis weight F-10 to F-15
Thickness (inches) Thickness Range Weight lb/yd²
1/16 0.050 - 0.075 0.60 - 0.70
1/8  0.105 - 0.145  0.98 - 1.14 
3/16  0.165 - 0.211  1.47 - 1.71 
1/4  0.224 - 0.276  1.96 - 2.28 
5/16  0.284 - 0.342  2.45 - 2.85 
3/8  0.343 - 0.407  2.94 - 3.42 
1/2  0.462 - 0.538  3.92 - 4.56 
5/8  0.581 - 0.669  4.90 - 5.70 
3/4  0.700 - 0.800  5.88 - 6.84 
7/8  0.819 - 0.931  6.86 - 7.98 
1  0.938 - 1.062  7.84 - 9.12 
2 1.875 - 2.125 15.68 - 18.24
Thickness (inches) Thickness Range Weight lb/yd²

Type I Roll Felt: F-50 to F-55

Type I Roll Felt, SAE No. F-50 F-51 F-55
Classification No. 16R1X 16R3X 12R3X
Wool Content ³% 95 92 75
Chlorothene Solubles £% 2.5 2.5 4.0
Water Solubles £% 2.5 2.5 4.0
Total Solubles £% 3.0 4.5 8.0
Ash Content £% 1.5 2.5 3.0
Tensile Strength ³ psi 500 300 200
Width = inches 60 or 72 60 or 72 60 or 72
Color White Gray Gray or black
Thickness vs. basis weight F-50 & F-51 F-55
Thickness (inches) Thickness Range Weight lb/yd² Thickness Range Weight lb/yd²
3/64  0.040 - 0.054  0.71 - 0.79 
1/16  0.056 - 0.070  0.94 - 1.01  0.056 - 0.070  0.71 - 0.79
5/64  0.071 - 0.085  1.16 - 1.24  — 
3/32  0.087 - 0.101  1.39 - 1.46  0.087 - 0.101 1.09 - 1.16

Recommendations

SAE Felt Applications

SAE F-1 is suitable for oil retention in installations where the felt is not compressed, for feeding low viscosity or light oil, and where unusual strength and hardness are required. Washers, bushings, wicks, door bumpers, polishing blocks and parts where wear and resistance to abrasion are required, are typical uses.

SAE F-13 & F-15 are recommended for sound deadening, chasis strips, spacers, dust shields, and for mechanical purposes where abrasion and wear are not important factors.

SAE F-2 & F-3 are recommended for vibration mountings and the same general purposes as F-1, but where a felt of slightly lower strength and hardness is satisfactory.

SAE F-50 is recommended for ball and roller bearing oil retainer washers and small dust-excluding washers. Also for mechanical purposes where an accurate, thin, smooth high-grade felt is required.

SAE F-5 & F-7 are recommended for dust shields, wipers, grease retainers washers, vibration mountings, and in uses where a resilient felt is required.

SAE F-51 is recommended for the same general uses as F-50, but in installations where tolerances and length of life are not as important. Also for thinly cut parts, such as gaskets and liners.

SAE F-10, F-11 & F-12 are recommended for grease and oil retention where the felt is confined and compressed in assembly. Also, recommended for dust shields under less severe operating conditions where F-5, F-6 and F-7 are not required.

Type II Sheet Felt: 12-S1 to 12-S4

Type II Sheet Felt, Class. No. 12-S1 12-S2 12-S3 12-S4
Wool Content ³% 95 95 95 95
Chlorothene Solubles £% 2.0 2.5 2.5  2.5
Water Solubles £% 2.0 2.5  2.5 2.5
Total Solubles £% 3.0 3.5 3.5 4.0
Ash Content £% 1.5 1.5  2.0 2.5
Tensile Strength ³ psi 400 300 300 300
Slit Resistance ³ psi 18 16 12 10
Water Swell £% 20 25  30 30
Color White White White White
Thickness vs. basis weight 12-S1 to S4
Thickness (inches) Thickness Range Weight lb/yd² (nominal)
1/4  0.230 - 0.270  2.8 - 3.20 (3.00) 
3/8  0.351 - 0.399  4.20 - 4.80 (4.50) 
1/2  0.470 - 0.530  5.60 - 6.40 (6.00) 
5/8  0.590 - 0.660  7.05 - 7.95 (7.50) 
3/4  0.710 - 0.790  8.50 - 9.50 (9.00) 
7/8  0.829 - 0.921  9.95 - 11.05 (10.50) 
1  0.949 - 1.051  11.40 - 12.60 (12.00) 
1-1/4 1.188 - 1.312 14.30 - 15.70 (15.00)
1-1/2 1.428 - 1.572 17.20 - 18.80 (18.00)
1-3/4 1.667 - 1.833 20.10 - 21.90 (21.00)
2 1.906 - 2.094 23.00 - 25.00 (24.00)
2-1/2 2.385 - 2.615 28.95 - 31.05 (30.00)
3 2.864 - 3.136 34.90 - 37.10 (36.00)
Thickness (inches) Thickness Range Weight lb/yd²

Type II Sheet Felt: 16-S1 to 16-S4

Type II Sheet Felt, Class. No. 16-S1 16-S2 16-S3 16-S4
Wool Content ³% 95 95 95 95
Chlorothene Solubles £% 2.0 2.5 2.5  2.5
Water Solubles £% 2.0 2.5  2.5 2.5
Total Solubles £% 3.0 3.5 3.5 4.0
Ash Content £% 1.5 1.5  2.0 2.5
Tensile Strength ³ psi 500 400 400 300
Slit Resistance ³ psi 32 28 22 20
Water Swell £% 25 30  35 35
Color White White White White
Thickness vs. basis weight 16-S1 to S4
Thickness (inches) Thickness Range Weight lb/yd² (nominal)
1/8  0.113 - 0.137  1.90 - 2.10 (2.00) 
3/16  0.176 - 0.200  2.85 - 3.15 (3.00) 
1/4  0.234 - 0.266  3.70 - 4.30 (4.00) 
3/8  0.356 - 0.394  5.60 - 6.40 (6.00) 
1/2  0.478 - 0.522  7.50 - 8.50 (8.00) 
5/8  0.599 - 0.651  9.40 - 10.60 (10.00) 
3/4  0.721 - 0.779  11.30 - 12.70 (12.00) 
7/8  0.843 - 0.907  13.25 - 14.75 (14.00) 
1  0.964 - 1.036  15.20 - 16.80 (16.00) 
1-1/4 1.208 - 1.292 19.10 - 20.90 (20.00)
1-1/2 1.451 - 1.549 23.00 - 25.00 (24.00)
1-3/4 1.694 - 1.806 26.90 - 29.10 (28.00)
2 1.937 - 2.063 30.80 - 33.20 (32.00)
2-1/2 2.424 - 2.576 38.75 - 41.25 (40.00)
3 2.910 - 3.090 46.70 - 49.30 (48.00)
Thickness (inches) Thickness Range Weight lb/yd²

Type II Sheet Felt: 20-S1 to 20-S4

Type II Sheet Felt, Class. No. 20-S1 20-S2 20-S3 20-S4
Wool Content ³% 95 95 95 95
Chlorothene Solubles £% 2.0 2.5 2.5  2.5
Water Solubles £% 2.0 2.5  2.5 2.5
Total Solubles £% 3.0 3.5 3.5 4.0
Ash Content £% 1.5 1.5  2.0 2.5
Tensile Strength ³ psi 600 500 400 300
Slit Resistance ³ psi 44 40 36 32
Water Swell £% 30  40  50 50
Color White White White White
Thickness vs. basis weight 20-S1 to S4
Thickness (inches) Thickness Range Weight lb/yd² (nominal)
1/8  0.113 - 0.137  2.20 - 2.80 (2.50) 
3/16  0.176 - 0.200  3.40 - 4.10 (3.75) 
1/4  0.236 - 0.264  4.60 - 5.40 (5.00) 
3/8  0.359 - 0.391  7.00 - 8.00 (7.50) 
1/2  0.481 - 0.519  9.40 - 10.60 (10.00) 
5/8  0.603 - 0.647  11.80 - 13.20 (12.50) 
3/4  0.725 - 0.775  14.20 - 15.80 (15.00) 
7/8  0.848 - 0.902  16.60 - 18.40 (17.50) 
1  0.970 - 1.030  19.00 - 21.00 (20.00) 
1-1/4 1.214 - 1.286 23.90 - 26.10 (25.00)
1-1/2 1.459 - 1.541 28.80 - 31.20 (30.00)
1-3/4 1.703 - 1.797 33.70 - 36.30 (35.00)
2 1.947 - 2.053 38.60 - 41.40 (40.00)
2-1/2 2.436 - 2.564 48.55 - 51.45 (50.00)
3 2.925 - 3.075 58.50 - 61.50 (60.00)
Thickness (inches) Thickness Range Weight lb/yd²

Type II Sheet Felt: 26-S1 to 26-S4

Type II Sheet Felt, Class. No. 26-S1 26-S2 26-S3 26-S4
Wool Content ³% 95 95 95 95
Chlorothene Solubles £% 2.0 2.5 2.5 2.5
Water Solubles £% 2.0 2.5 2.5 2.5
Total Solubles £% 3.0 3.5 3.5 4.0
Ash Content £% 1.5 1.5  2.0 2.5
Tensile Strength ³ psi 600 500 400 400
Slit Resistance ³ psi 48 46 40 30
Water Swell £% 40 50 60 60
Color White White White White`
Thickness vs. basis weight 26-S1 to S4
Thickness (inches) Thickness Range Weight lb/yd² (nominal)
1/8  0.115 - 0.135  2.85 - 3.65 (3.25) 
3/16  0.178 - 0.198  4.40 - 5.40 (4.90) 
1/4  0.239 - 0.261  5.90 - 7.10 (6.50) 
3/8  0.362 - 0.388  8.95 - 10.55 (9.75) 
1/2  0.484 - 0.516  12.00 - 14.00 (13.00) 
5/8  0.607 - 0.643  15.15 - 17.35 (16.25) 
3/4  0.730 - 0.770  18.30 - 20.70 (19.50) 
7/8  0.853 - 0.897  21.45 - 24.05 (22.75) 
1  0.975 - 1.025  24.60 - 27.40 (26.00) 
1-1/4 1.221 - 1.270 31.00 - 34.00 (32.50)
1-1/2 1.467 - 1.533 37.40 - 40.60 (39.00)
1-3/4 1.712 - 1.788 43.80 - 47.20 (45.50)
2 1.958 - 2.042 50.20 - 53.80 (52.00)
Thickness (inches) Thickness Range Weight lb/yd²

Type II Sheet Felt: 32-S1 to 32-S4

Type II Sheet Felt, Class. No. 32-S1 32-S2 32-S3 32-S4
Wool Content ³% 95 95 95 95
Chlorothene Solubles £% 2.0 2.5 2.5 2.5
Water Solubles £% 2.0 2.5 2.5 2.5
Total Solubles £% 3.0 3.5 3.5 4.0
Ash Content £% 1.5 1.5 2.0 2.5
Tensile Strength ³ psi 600 500 400 400
Slit Resistance ³ psi 50 48 46 40
Water Swell £% 50 60 70 70
Color White White White White
Thickness vs. basis weight 32-S1 to S4
Thickness (inches) Thickness Range Weight lb/yd² (nominal)
1/8  0.118 - 0.132  3.50 - 4.50 (4.00) 
3/16  0.181 - 0.195  5.25 - 6.75 (6.00) 
1/4  0.243 - 0.257  7.00 - 9.00 (8.00) 
3/8  0.366 - 0.384  10.90 - 13.10 (12.00) 
1/2  0.489 - 0.511  14.80 - 17.20 (16.00) 
5/8  0.612 - 0.638  18.70 - 21.30 (20.00) 
3/4  0.735 - 0.765  22.60 - 25.40 (24.00) 
7/8  0.858 - 0.892  26.50 - 29.50 (28.00) 
1  0.981 - 1.019  30.40 - 33.60 (32.00) 
1-1/4 1.228 - 1.272 38.30 - 41.70 (40.00)
1-1/2 1.474 - 1.526 46.20 - 49.80 (48.00)
1-3/4 1.712 - 1.779 54.10 - 57.90 (56.00)
2 1.968 - 2.032 62.00 - 66.00 (64.00)
Thickness (inches) Thickness Range Weight lb/yd²
Lengths Types 1 & 2
Length, Types I & II

Type I
Each roll shall contain not more than two pieces, neither of which shall be less than 3 yards in length. When specified, 3/4 to 2 inch-thick felt may be put up in sheets ³ 72 by 36 inches.

Thickness (inches) Length (yards)
³ 5/16 26 to 55
> 5/16 £ 1/2 13 to 33
>1/2 £ 1 7 to 17
2 3 to 7

Type II  
Felt shall be furnished in sheets 36 inches by 36 inches ± 1/2 inch.

 

Properties that apply to Types I & II

 

Acid Resistance Good (except F-7) Effect of Sunlight and Oxidation None
Alkali Resistance (dilute) Fair Temperature Range -80 to 200° F
Solvent Resistance Excellent Thermal Expansion 0
Compression Recovery ³ 99% -- --

Certifications

Certificates of compliance from AFFCO's complete in-house physical and chemical laboratory accompany Types I and II.

Capabilities

AFFCO manufacturers a complete line of engineered felts:
Wool
• Synthetics
• Blends and Composites
• Needled and Pressed

Applications

Mechanical Felt Applications

 

Cushioning & Padding 
Felt's tough, interlocking fibers provide excellent resilient protection against intermittent or sustained impact. Resiliency is controlled by selected combinations of densities and fibers. Some uses: orthopedic pads, bumpers, athletic equipment, industrial cushioning.  

Gasketing & Sealing 
Select combinations of physical properties, liquid absorption, low coefficient of friction, and resiliency position felt for many special applications requiring gaskets and seals. Airtight, water-tight, dust-tight seals, plain, treated, or laminated often serve as lubricating media as well. Impregnations and laminations open felt media to the wide spread applications. 

Wicking & Lubrication (Fluid Transfer) 
AFFCO manufactures felt in many highly absorptive forms with unique controlled wicking acton that enables it to store, and deliver specified and measured amounts of fluids such as oils, inks, chemicals, and medicines. Examples are oil wicks, marker nibs, and air fresheners.  

Vibration & Shock Control 
Felt is a shock absorbing material. It has high resiliency, low compression set, and long life characteristics. Felt reduces large scale vibration and shock transmission by up to 85%.  

Polishing 
AFFCO's felt making process controls the texture and firmness of the felt in order to produce the desired degrees of abrasiveness for polishing the roughness and irregularities from a wide range of materials. In addition, felt has absorbent properties to hold rouge, waxes, and other polishing liquids. 

Felt Construction

Type I & II Felt Construction

Type I & II felts are industrial fabrics with high a percentage of wool fibers which are interlocked by applying combinations of mechanical pressure, chemical treatment, moisture, and heat. The wool felt making process depends on the natural tendency of wet wool fibers to tightly interlock. The process results in pressed wool felt, where the higher the percentage of wool the more dense and stronger the felt is. On the other hand, the higher the percentage of "filler" fibers (often rayon) make the felts less dense and more porous. Many end uses demand the densities and porosities of pressed felt.