Specific Weight/ Density
The specific weight (density) is the measure of the firmness of the felt and computes itself from the quotient weight [ kg ] by volume [ dm³ ] (unit kg/dm³ or also g/cm³). The firmness is divided into 4 classes (soft, mean, firm, hard). The German standard DIN 61200 regulates the exact firmness designations and their tolerances .
Densities according to DIN 61200
soft |
mean |
firm |
hard |
W1 0,08 |
M1 0,18 |
F1 0,32 |
H1 0,52 |
W2 0,10 |
M2 0,20 |
F2 0,36 |
H2 0,56 |
W3 0,12 |
M3 0,22 |
F3 0,40 |
H3 0,60 |
W4 0,14 |
M4 0,25 |
F4 0,44 |
H4 0,64 |
W5 0,16 |
M5 0,28 |
F5 0,48 |
H5 0,68 |
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M6 0,30 |
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Of course we manufacture felt, which is still harder than a density of about 0,68. We will dispatch a firmness and/or a quality sample to you, if you need to.
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Other densities in comparison
Polystyrene
Cotton wool
Fleece
Needled felt
Woven felt
Wood
Oil
Polyprophylen (PP)
Water
Wool fibres
Aluminium
Iron
Gold
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0,02 - 0,06
0,05 - 0,10
0,05 - 0,30
0,08 - 0,36
0,08 - 0,68
0,50 - 0,90
0,80 - 0,90
0,91
1,00
1,30
2,70
7,90
12,30
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