Seal - MEIJI SANGYO COMPANY

Seal

Item

Temperature and Time

Standard

1.	Normal Condition

Aging resistance

175 deg.(347 deg.F), 22 hrs.

Range of change in hardness IRHD 0 to +15

3.	Fluid resistance

120 deg.(248 deg.F), 70 hrs.

1.	Range of change in brake fluid. Volume 0 to +15%, Hardness IRHD 0 to +15
2.	No extreme cohesion on cups nor change on appearance.

4.	Precipitation

120 deg.(248 deg.F), 70 hrs.

Precipitation Max. 0.05 v/v

5.	Corrosion resistance

100 deg.(212 deg.F), 120 hrs.

1.	No visible pittings or tears shall be found. Slight staining or discoloration shall be permissible.
2.	Not more than a light precipitate shall be found.
3.	Not extreme changes on shape and appearance.

6.	Resistance to low temperature

-40 to -43 deg.
(-40 to -45.4 deg.F) 22 hrs.

To be restored to original shape without cracks within 1 minute.

7.	Resistance to leakage at low temperature

-40 to -43 deg.
(-40 to -45.4 deg.F) 120 hrs.

1.	Fluid pressure and repetitive movements 10 kgf/cm2 X 6 times and 43 kgf/cm2 X 6 times
2.	No leakage

8.	Normal temperature stroking durability

4 to 35 deg.(39.2 to 95 deg.F)
70 kgf/cm2
1,000 strokes /hour
50,000 strokes

1.	No drop in pressure during tests due to leakage.
2.	No leakage after tests.
3.	No excessive tackiness, scoring. scuffing, blistering, cracking, chipping and change in shape.
4.	No visible corrosion on the piston and bore of cylinder where contact with seal. Slight staining or discoloration shall be permissible.

9.	High temperature stroking durability

120 deg.(248 deg.F) 70 kgf/cm2
1,000 strokes /hour
70,000 strokes

10.	Corrosion in storage

1.	Use assembling fluid or rubber grease.
2.	No corrosion, pitching cohesion, things that generate corrosion not substances which are formed by mutual reaction of consituting materials shall be found.