Shree Felts
Shree Felts

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Indian Standards

TABLE 1 PHYSICAL REQUIREMENTS FOR GENERAL PURPOSE FELTS (Clause 6.1)

TYPE THICKNESS
mm
DENSITY
gm/ccm
TENSILE
STRENGTH
kN/mm2
SPLITING
RESISTANCE
N/cm
LENTH WIDTH FINISH
Hard As agreed
(See 
Note No.1)
0.60 4100 75 As declared
or agreed
(See Note.3)
As declared
or agreed
+/-2 Percent
Milled
Extra Hard 0.46 3400 65 Milled
Extra Firm 0.40 2900 55 Milled
Firm 0.34 2400 40 Milled
Medium Firm 0.27 1500 26 Milled
Medium 0.23 1400 22 Milled
Soft 0.18 900 (See Note.2) Hardened
Extra Soft 0.15 (See Note.2) (See Note.2) Hardened
Method of Test B-2 B-3 B-4 B-5   IS : 1954
Note 1 : The common thickness of felts are 1.5, 3, 6,10,13,16,19,22 & 25 mm
Note 2 : The requirements of tensile strength and splitting resistance are recomandatory and shall be applicable, if specifically agreed between the buyer and the seller.
However,the splitting resistance shall not be applicable incase of felts having thickness of 6mm and below and also in case of soft & extra soft Felts. Tensile strength shall not be applicable in case of extra soft felt.
Note 3 : No negative tolerance shall be permitted in length of felt.

TABLE 2 PHYSICAL REQUIREMENTS FOR PRECISION FELTS (Clause 6.1)

TYPE THICKNESS
mm
DENSITY
gm/ccm3
TENSILE
STRENGTH
kN/mm2
SPLITING
RESISTANCE
N/cm
Oil Retention
RESISTANCE
Percent
LENGTH
m
WIDTH
cm
Extra Hard As agreed
(See 
Note No.1)
0.60 5500 100 80 As declared
or agreed
+/-2%
(See Note No.3)
Hard 0.46 4500 87 90
Extra firm 0.40 3800 70 100
Firm 0.34 3100 50 120
Medium firm 0.27 2000 35 140
Medium 0.23 1800 30 150
Soft 0.18 1200 25 160
Extra Soft 0.15 --- --- ---
Method of Test B-2 B-3 B-4 B-5   IS : 1954
Note 1 : The common thickness of felts are 1.5, 3, 6,10,13,16,19,22,25 & 50 mm
Note 2 : The splitting resistance shall not be determined in case of felts thickness of 6mm & below.
Note 3 : No negative tolerance shall be permitted in length of felt.

GENERAL PURPOSES FELTS SHALL BE AS FOLLOWS

Felt Thickness Tolerance on Nominal
& Density
Tolerance on
Nominal & Density
4.0 mm and below +/- 20 perce +/- 25
(See Note)
4.1 mm to 10 mm +/- 15 perce +/- 20
(See Note)