List of TOPAS® COC grades

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7. Mold design

7.7 Mold material

Since TOPAS® COC does not easily cause mold corrosion or wear, etc., there are no specific points to be noted for mold material. However, in the case of surfaces having difficulties in mold release, such as optical surfaces, some surface treatment to inhibit the adhesion of TOPAS may be required. Fig. 7-5 shows surface treatments and adhesion strength of TOPAS. It is obvious that the adhesion is reduced and mold release is facilitated by treatments of TiC, CrN, etc.

Fig. 7-5 Surface treatments and results of adhesion evaluation of resins