Wool Felt Specification
Please find below the specification sheet for wool felts.
| General Properties |
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| Grade |
20S1
26S2
20S3 26S4 |
20S1
20S2
20S3 20S4 |
16S1
16S2 |
16S3
16S4 |
12S1
12S2 |
12S3
12S4 |
| Wool Content (fibre basis) %min |
80 |
80 |
80 |
80 |
80 |
80 |
| Thickness Range (mm) |
3-76 |
3-76 |
3-76 |
3-76 |
3-76 |
3-76 |
| Roll width (mm) |
914 |
914 |
914 |
914 |
914 |
914 |
| Texture |
coarse
extra fine |
coarse
extra fine |
fine
extra fine |
medium
coarse |
fine
extra fine |
coarse
medium |
| Colour |
white |
white |
white |
white |
white |
white |
| Physical Properties |
|
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|
|
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| Density - Specific Gravity |
0.555 |
0.426 |
0.342 |
0.342 |
0.256 |
0.256 |
| Temperature Range (°F) |
-80 to +200 |
-80 to +200 |
-80 to +200 |
-80 to +200 |
-80 to +200 |
-80 to +200 |
Thermal Conductivity, 70°F
Btu/(hr)(ft2/°F) (in.) |
0.63 |
0.45 |
0.36 |
0.36 |
0.30 |
0.30 |
Coefficient of Thermal
Expansion, per °F |
0 |
0 |
0 |
0 |
0 |
0 |
Air Permeability, 1/16in.,
(ft3/min)(ft2/0.5in. H2)) |
>5 |
>15 |
>25 |
>35 |
>40 |
>60 |
Liquid Absorption
wt% (1.0sp gr liquid)
vol. % |
>75
58 |
>100
66 |
>175
74 |
>175
74 |
>250
81 |
>250 81 |
Capillarity, (wicking height,
575 SSU, 70°F), in. |
5.0 |
4.5 |
4.0 |
4.0 |
3.0 |
3.0 |
| Coefficient of friction |
0.42 |
0.42 |
0.37 |
0.37 |
0.37 |
0.37 |
Vibration Absorption
static load bearing, per unit area
dynamic stress endurance |
very high
med high |
high
med high |
high
med high |
high
med high |
medium
med high |
medium
med high |
| coefficient of noise reduction (1in . thick) |
0.28 |
0.41 |
0.50 |
0.50 |
0.58 |
0.58 |
| Mechanical Properties |
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|
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|
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| Tensile Strength |
700 |
600 |
500 |
500 |
400 |
400 |
| elongation at 100psi % |
4 |
9 |
12 |
12 |
28 |
28 |
Mullen burst strength
(1/8in. thick), psi |
>400 |
>325 |
>250 |
>250 |
>150 |
>150 |
| Split resistance, lb/2-in width, min |
30-48 |
32-44 |
28-32 |
20-22 |
16-18 |
10-12 |
| Hardness Range shore A |
55-65 |
45-55 |
30-40 |
30-40 |
20-30 |
20-30 |
| Compressibility (at10% defl) psi |
86 |
58 |
32 |
32 |
18 |
18 |
Recovery (within 1min
after 10% deflection), % |
99 |
99 |
99 |
99 |
99 |
99 |
| vibration disintegration |
none |
none |
none |
none |
none |
none |
| Chemical & Environmental |
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| effect of sunlight & oxidisation |
none |
none |
none |
none |
none |
none |
| solvent resistance |
excellent |
excellent |
excellent |
excellent |
excellent |
excellent |
| stability in oil |
excellent |
excellent |
excellent |
excellent |
excellent |
excellent |
| acid resistance - dilute |
excellent |
excellent |
excellent |
excellent |
excellent |
excellent |
| acid resistance - concentrated |
fair-good |
good-fair |
good-fair |
good-fair |
good-fair |
good-fair |
| Grade of Felt |
Typical Applications |
| Medium - Hard Density Felt |
Wheels buff for polishing lenses, mirrors and glass, metals, wood, marble and granite. Fluid transfer - ink rolls, Drilled wicks, Bearing seal washers, Stamp pads, Shoe soles |
Medium Density Felt
|
Polishing wheels and buffs for precious metals, plastics, rough optical polishing, metal wiping, drum beaters, drilled wicks, bearing seals, fluid transfer rolls, oil retaining washers, vibration mounts, plugs, glass channels |
| Soft Density Felt |
Polishing wheels and buffs for polishing plastics, wiping brass, piano wedges, sugical pads, absorbant pads, wicks, shim and spacer pads, shoe insoles |
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