| Item |
Temperature and Time |
Standard |
|
|
|
| Hardness |
Hs. 60 or 65 or 70 |
| Tensile strength |
Min. 10 MPa(100 kgf/cm2) |
| Elongation |
Min. 300 % |
|
| 2. |
Permanent distortion by pressure |
|
120 deg.(248 deg.F), 22 hrs.
150 deg.(302 deg.F), 22 hrs. |
Max. 30 % |
|
|
120 deg.(248 deg.F), 70 hrs.
150 deg.(302 deg.F), 70 hrs. |
Range of change in hardness Hs. -5 to +5 |
|
|
120 deg.(248 deg.F), 70 hrs.
150 deg.(302 deg.F), 70 hrs. |
| 1. |
Range of reaction in brake fluid. Volume 0 to +20%, Diameter of lip and base 0 to +5%, Hardness Hs. 0 to -15 |
| 2. |
No extreme cohesion on cups nor change on appearance. |
|
|
|
120 deg.(248 deg.F), 70 hrs.
150 deg.(302 deg.F), 70 hrs. |
No more than a light precipitate shall be found. Volume Max. 0.3 vol% |
|
|
100 deg.(212 deg.F), 120 hrs. |
| 1. |
Cups not to be adhered to the cylinder and piston. |
| 2. |
Not more than a light precipitate shall be found. Volume Max. 0.2 vol% |
| 3. |
Not to create rust, corrosion, sludge or gummy substance on the metal parts.
Slight discoloration shall be permissible. |
|
| 7. |
Resistance to low temperature and leakage |
|
-40 deg.(-40 deg.F), 22 hrs.
-40 deg.(-40 deg.F), 120 hrs. |
| 1. |
Hardness Hs. Max. 90 Range of change in hardness Hs. 0 to +25 |
| 2. |
To be restored to original shape without cracks within 1 minute. |
| 3. |
No leakage. |
|
|
|
* Master cylinder
100 deg.(212 deg.F), 70 hrs.
120 deg.(248 deg.F), 70 hrs.
7 MPa(70 kgf/cm2)
* Wheel cylinder
120 deg.(248 deg.F), 22 hrs.
120 deg.(248 deg.F), 22 hrs.
10 MPa(100 kgf/cm2) |
| 1. |
No leakage. |
| 2. |
Excess over bore of cup
| Diameter |
Excess over bore mm(in.) |
| Master cylinder cup |
Wheel cylinder cup |
Under 3/4"
13/16" to 1"
1-1/16" to 1-1/2"
Over 1-5/8"
|
Min. 0.30 (0.010)
Min. 0.40 (0.015)
Min. 0.51 (0.020)
Min. 0.65 (0.025) |
Min. 0.40 (0.015)
Min. 0.51 (0.020)
Min. 0.65 (0.025)
Min. 0.80 (0.030) |
|
| 3. |
No excessive tackiness, scoring. scuffing, blistering, cracking, chipping
and change in shape. |
| 4. |
No corrosion on the sliding part of the piston and the bore of the cylinder
where contact with cup. Slight staining or discoloration shall be permissible. |
| 5. |
Change in hardness Hs. 0 to -15 |
|
|
|
| (1) |
45 deg.(113 deg.F)
humidity 95 %, 16 hrs. |
| (2) |
20 deg.(68 deg.F)
humidity 95 %, 8 hrs. |
| 12 times each by turns of (1) and (2) |
|
| 1. |
Use assembling fluid or rubber grease. |
| 2. |
No corrosion on the contacting parts of the piston and cylinder with cups.
Slight contamination or discoloration shall be permissible. (Any corrosion
or contamination on the parts detached from the cups shall not be considered
as defect of the cups.) |
|
Seiken Products
Cup
