Rubber Cork Product Data Sheet

GRADES OFFERED
IN INDIA		 CHETAK
(General Purpose)		 CHETAK
(Medium Oil Resistant)		 CHETAK
(Good Oil Resistant)		 CHETAK
(Very Good Oil Resistant)		 CHETAK
(Excellent Oil & Heat Resistant)
Grades &
Properties		 RC-50A
G-2		 RC-70A
RR-9		 RC-80A
RR-8		 RC-50
MR-5		 RC-70
MR-7		 RC-80
MR-8		 RC-50B
GR-5		 RC-70B
GR-7		 RC-80B
GR-8		 RC-50C
TF-5		 RC-70C
TF-7		 RC-80C
TF-8		 Excellent
RC-70C
TR-9
Hardness IRDH 50±10 70±5 80±5 50±5 70±5 80±5 50±5 70±5 80±5 50±5 70±5 80±5 70±5
Dimesion changes
% max		 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5
Tensile Strength
*KPa Min.		 650 900 1250 650 900 1250 700 1250 1550 1250 1550 1900 1960
Compressibility %
(at 2800 KPa)		 45-60 30-45 15-30 45-60 30-45 25-40 45-60 35-50 25-35 35-45 25-35 15-25 25-35
Recovery % Min. 80 80 80 80 80 75 80 80 80 80 80 80 80
Compression Set % Max. 90 90 90 85 85 90 85 85 90 80 85 90 80
Chemical Test on Water Extracts
(a) Ph, where applicable 5.0 to 8.5 5.0 to 8.5 5.0 to 8.5 5.0 to 8.5 5.0 to 8.5
(b) Chloride content
(as chloride ion)		 0.2% max. 0.2% max. 0.2% max. 0.2% max. 0.2% max.
(c) Sulphate content
(as sulphate ion)		 0.2% max. 0.2% max. 0.2% max. 0.2% max. 0.2% max.
Oil immersion test, Volume change after immersion in ASTM oil No.3 for 70 hours at 100˚ C temp. > 60% 40%-60% 25%-40% 25% max. 15% max. 10% max.
Volume change
in I.S. 335 Oil		 - - - 8% max. 6% max.
Gaskets Application area General Purpose General Purpose

Light Electric & General Automotive Industry		 General Purpose

Automobile Industry		 Automobile Industry

Light Electric & General Automotive Industry		 Automobile Industry

Aircraft Industry		 Heavy Electrical Industry

Ship Building
* 98.0665 KPa = 1 kg/cm2; Grades indicated are as per IS 4253 PART II 1980.