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 |
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Compressive modulus10 PSI | 670 |
|
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| 60 |
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N. GANDHI & CO.
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