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"Technical"
felt
High Density Sheets
Technical felts are generally
available in four grades and densities ranging from 16 pounds to 32 pounds.
(Remember, felt density is determined by weighing a 36" x 36" x 1" sample.
For example, if a 36" x 36" x 1" felt sheet weighs 20 lbs., it is referred
to as "20-lb. felt. Higher densities to more than 50 pounds are available.)
The four grades are: S1 (Extra Fine White Wool); S2 (Fine White Wool);
S3 (Coarse White Wool);
and S4 (Coarse Gray Wool).
Density Conversion
Chart
36" x 36" Sheet Thickness
| DEN |
1/4 |
1/2 |
3/4 |
1" |
1 1/4 |
1 1/2 |
2" |
| 16 |
4 lb |
8 lb |
12 lb |
16 lb |
20 lb |
24 lb |
32 lb |
| 20 |
5 lb |
10 lb |
15 lb |
20 lb |
25 lb |
30 lb |
40 lb |
| 26 |
6.5 lb |
13 lb |
19.5 lb |
26 lb |
32.5 lb |
39 lb |
52 lb |
| 32 |
8 lb |
16 lb |
24 lb |
32 lb |
40 lb |
48 lb |
64 lb |
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Properties
That Apply To all Technical Felts
| Wool Content, % min |
95 |
| Thickness Range |
1/8" to 3" |
| Thermal Expansion |
0 |
| Compressibility Recovery,
% |
99.0 |
| Effect of Sunlight &
Oxidation |
None |
| Solvent Resistance and Stability
In Oil |
Excellent |
| Alkali Resistance |
Fair |
| Acid Resistance (concentrated) |
Good |
| Temperature Range, F |
-80 +200 |
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| Properties |
16S Soft |
20S Med |
26S Hard |
32S Hard or Extra Hard |
| Commercial Grade |
16S |
20S |
26S |
32S |
| Coef of Friction % |
0.37 |
0.42 |
0.42 |
0.42 |
| Density 1" lbs/sq. yard |
16 |
20 |
26 |
32 |
| Specific Gravity (%) |
34 |
43 |
56 |
68 |
| Therm. Cond. (70F), btu/hr/sq
ft/F/in |
0.36 |
0.45 |
0.63 |
0.91 |
| Air Perm (1/16"), cfm/sq
ft/5" H2O |
<20 |
10 |
<3 |
<1 |
| Liquid Absorption, % wt.
(1.0 sp gr) |
>175 |
>100 |
>75 |
>50 |
| Liquid Absorption, % by
volume |
74 |
66 |
58 |
48 |
| Wicking Height |
4.0 |
4.5 |
5.0 |
5.5 |
| Vibration Absorption Static |
High |
High |
Very High |
Ultra High |
| Vibration Dynamic Stress |
High |
High |
High |
High |
| Noise Reduction Coef (1") |
0.50 |
0.41 |
0.28 |
0.05 |
| Tensile Strength (min),
psi |
300-500 |
300-600 |
400-600 |
400-600 |
| Elongation (100 psi), % |
N/A |
N/A |
N/A |
N/A |
| Mullen B.S. (1/8"), psi |
250 |
325 |
N/A |
N/A |
| Split Resistance (min),
lb/2" width |
20-32 |
32-44 |
30-48 |
40-50 |
| Hardness, Shore A |
30-40 |
45-55 |
55-65 |
75-85 |
| Compressibility (10% defl),
psi |
32 |
58 |
86 |
121 |
| Abrasion Resistance |
Excellent |
Excellent |
Excellent |
Excellent |
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