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Sipra Engineers

Surface Finish, As Cast

General Purpose of Standard on As Cast Surface Finish:
For some applications it is desirable to specify Surface finish requirements. The purpose of this specification is to classify as cast surface finish of die castings into a series of grades so that the type of finish required may be defined in advance. These standards should be used to classify the type of finish only, and final quality. standards should be agreed upon between the die caster and the customer.

  As Cast Finish End Finish or Use
1. Surface imperfections (cold shut, blisters, oil flow marks, surface porosity, etc.) non objectionable. Surface finish of no importance
2. Some Surface imperfections (Cold Shut, rubs, surface porocity etc.) not objectionable. Protective Coatings :
Anodize (non-decorative)
Chromate
Heavy paint
Matte or wrinkle finish
3. Slight Surface imperfections (Cold Shut, rubs, surface porocity etc.) can be removed by spot polishing, not objectionable Decorative Coatings:
Lacuers
Enamels
Plating (AI)
Chemical Finish
Polished Finish
4. Surface imperfections, that can be removed by automatic buffing only, not objectionable Structural parts (High stress areas)
Plating(Zn)
Electrostatic Painting
5. No objectionale surface imperfectiones that would be highlighted by eletctro-chemical polishing. Where surface waviness (Flatness) noted by light reflection is a reason for rejection. Special agreement should be reached with the die caster  


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