GRADE |
Sphericity |
Tolerance |
Surface |
||
um. |
Micro-Inches |
um. |
Micro-Inches |
||
I |
12.5 |
500 |
+/-12.5 |
+/-500 |
Polished |
II |
25 |
1000 |
+/-25 |
+/-1000 |
Polished |
III |
125 |
5000 |
+/-125 |
+/-5000 |
Unpolished |
These characteristics are given by plastic ball manufacturers. they can differ on the types of production cysle.
Properties |
Acetal |
Polyamide |
Polyethylene low density |
Polyethylene high density |
Ptfe flurocaron |
Physical |
|||||
Specific gravity |
1042 |
1013-1015 |
0.910-0.925 |
0.941-0.965 |
2.14-2.20 |
Water absorption 24 hr (1/8 in thick specimen) % Saturation |
0.25-0.40 500(90ml) |
1.0-1.3 8.5 |
<0.01 |
<0.01 |
<0.01 |
Dielectric strenght |
500(90ml) |
600 |
450-1000 |
450-1000 |
480 |
Mechanical |
|||||
Tensile streght at break psi |
|
12000-11000 |
600-2300 |
3100-5500 |
2000-5000 |
Elongatiopm at break % |
25-75 |
60,300 |
90-800 |
20-130 |
200-400 |
Tensileyield strenght PSI |
95000-12.000 |
8000,6500 |
800-1200 |
3000-4000 |
|
Tensileyield modulus 10 PSI |
520 |
|
14-38 |
60-180 |
58-80 |
Compressive strenght Rupture or yield )PSI |
18.00@10% |
15.00(YLD) |
|
2700-3600 |
1700 |
Flexural strenght (Rupture or yield )PSI |
14.000 |
17.000,6100 |
|
|
|
Compressive modulus10 PSI |
670 |
|
|
|
60 |
N. GANDHI & CO.
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