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Thomas West Incorporated (TWI) develops and supplies polishing pads for Chemical Mechanical Planarization (CMP) in semiconductor manufacturing; and polishing, texturing and wipe tapes for hard disk drives (HDD). Based in Sunnyvale, Calif., the company is ISO-9001 certified. It is a member of Semiconductor Equipment & Materials International, International Disk Drive Equipment & Materials Association and Chemical Mechanical Planarization Users Group (CMPUG). Thomas West Incorporated (TWI) supplies textile and urethane-based polishing products to the semiconductor and hard disk drive industries.