SHOWA

Showa Hard
Models
Hardness
Tensile
strength
Elongation
at break
Service
temperature(C)

Kind of rubber
Major use

ASTM D
JIS-A
( kg/ cm)
(%) Max
(Heat ) 
Min
( cold ) 
H1 D 65 85 180
or over
5 - 50 80 - 10 hard natural rubber
chemicals resistant
( ordinary use )
H203 D 65 85
(at 20 C)
180
or over
10 - 50 100 - 10 hard natural rubber
heat resistant chlorine resistant ( job site use )
Showa Soft
Models
Hardness
Tensile
strength
Elongation
at break
Service
temperature(C)

Kind of rubber
Major use

ASTM D
JIS-A
( kg/ cm)
(%) Max
(Heat ) 
Min
( cold ) 
S 1 A 47 57 220
or over
400
or over
60 - 40 soft natural rubber
abrasion resistant chemical resistant
( ordinary use )
S 2 A 35 45 200
or over
500
or over
60 - 40 soft natural rubber
(white color)

alkali resistant abrasion resistant
( uncontamination use )
Showa Prene
Models
Hardness
Tensile
strength
Elongation
at break
Service
temperature(C)

Kind of rubber
Major use

ASTM D
JIS-A
( kg/ cm)
(%) Max
(Heat ) 
Min
( cold ) 
P-101 A 58 68
(at 20C)
150
or over
350
or over
120 - 20 chloroprene rubber
heat resistant chemicals resistant
abrasion resistant
Showa Seal
Models
Hardness
Tensile
strength
Elongation
at break
Service
temperature(C)

Kind of rubber
Major use

ASTM D
JIS-A
( kg/ cm)
(%) Max
(Heat ) 
Min
( cold ) 
B-101 A 53 63 75
or over
400
or over
100 - 30 butyl rubber
fluoride resistant
chemical resistant