Dubl-Chek Websites
Sherwin Inc | Liquid Dye Pentrants and Accessories
Under the trade names of Dubl-Chek and Aqua-Chek, Sherwin Incorporated manufactures fluorescent penetrant and visible dye penetrant and related products used in the non-destructive testing of critical components in the aerospace and welding industries. Contact: Sherwin Inc., 5530 Borwick Ave., So. Gate, CA 90280, USA (
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