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

 

M6 0,30

   

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.

Other densities in comparison

Polystyrene

Cotton wool

Fleece

Needled felt

Woven felt

Wood

Oil

Polyprophylen (PP)

Water

Wool fibres

Aluminium

Iron

Gold

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

19,30

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