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(6) These molds are made to commercial tolerances and will have flash around the parting line of balls. Precision, or flashless balls, are also available in various sizes and materials. These balls are OD ground which eliminates any flash or parting line and can result in TiR tolerances of ±.003. Higher production volumes are required on flashless balls as a result of the set-up of special equipment.
Precision Rubber O-Rings are the most widely-used type. Synthetic rubber can be compounded for continual use at high or low temperatures or for occasional short exposure to wide variations in temperature. The effect of temperature changes from 65° F. to 250° F. on the performance of O-ring seals depends upon the seal material used.
At extremely low temperatures the seals become brittle but will still seal. They resume their normal flexibility without harm when warmed. Prolonged exposure to excessive heat causes perma nent hardening and usually destroys the usefulness of the seal. The co-efficient of the thermal expansion of synthetic rubber is usually low enough so that temperature changes ...
(17) Standard material for the hole plugs is a 50 durometer Styrene Butadiene/Polyisoprence blend with good tensile. Other materials are special order.
