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Wiper seals, lip seals, and similar parts are frequently designed with a sharp edge, referred to as a knife edge or feather edge. It is difficult to hold such a thin edge in the molding process, as these edges tend to tear during removal from the mold. Normal deflashing can also chip a sharp edge.
Unless a sharp edge is absolutely necessary, we recommend squaring off edges [.010 in (0.25 mm) minimum flat] to ensure clean surfaces on the finished product.
Designing Rubber Components
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