classes

solution

concentration

Covered condition 

The change rate before and after covered

Volume expansivity

Strength change rate

A1

（HCI）

18%

50℃×96h

＋10%≥

－10%≤

A2

(H2SO4)

50%

50℃×96h

＋10%≥

－10%≤

A3

(NaOH)

48%

50℃×96h

＋10%以下

－10%以內

Rubber name performance

NBR

CR

EPDM

NR

SBR

ACM

VMQ

FVMQ

FKM

Anti-tear

G

F-G

F

E

E

B-F

B-F

B

F-G

abrasion

E

E

G

E

G

F

B-F

B

G

weather ability

B

E

E

B

B

E

E

E

E

Water resistance

E

G

E

E

E

B

G-E

E

E

ozone resistant

B-F

E

E

B-F

B-F

E

E

E

E

Oxidation resistance

G

E

E

G

G

G

E

E

E

compression set

G-E

G-E

G-E

F

F

G

F-E

G

G-E

acid resistance（attenuation）

G

E

E

G

G

B-F

G

E

E

acid resistance（concentration）

G

E

E

G

G

B-F

F

G

E

Alkali resistant（attenuation）

G

E

E

G

G

B-F

E

E

E

Alkali resistant（concentration）

G

E

E

G

G

B-F

E

G

P

syntholube

G-E

B

P

P

P

B

P

E

E

Low grade lube

E

E

P

P

P

E

G

E

E

High grade lube

E

G

P

P

P

E

F

E

E

Animal and vegetable oil

G

G

G-E

P

P

G

E

E

E

The electrical resistance

B-F

E

E

B-F

B-F

F

G-E

E

G