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TABLE 1 PHYSICAL REQUIREMENTS FOR FELT (Clause 3.1)

SL. No.

Characteristic

Requirement

Tolerance

Method of Test

Length

As agreed. In case of
partial delivery, as
marked or declared.
(See Note 1)

----

IS: 1954-1969

Width, cm

132 or as agreed.

+/- 1

IS: 1954-1969*

Thickness

As agreed (See Note 2)

Up to 3: +/-15%
3 upto 16: +/-10%
Above 16: +/- 5 %

+/- 10%

Appendix B

Appendix C

Density, g/ccm3

a) Extra Hard
b) Hard
c) Medium Hard
d) Soft

0.33
0.24
0.18
0.15

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Tensile strength, k

a) Extra Hard
b) Hard
c) Medium Hard
d) Soft

24
14
9
See Note 3

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Spliting resistance, on
2.5x15 cm strips,
Min (See Note 4)

1.25

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Appendix D

Methods for determination of length and width of fabrics (first revision)

Note 1	The usual piece length of felt are 4 and 14 metres.
Note 2	The common thickness of felt are 1.5,3,6,10,13,16,19,22 and 25 mm
Note 3	This test is not to be carried out on soft variety of felt.
Note 4	This test is not to be carried out on soft & medium hard varieties of felt and also on felthaving thickness of 6 mm or below.