Transparent Materials (Linear Mar Test) SITUATION: Historically the Taber Rotary Abraser has been utilized to evaluate abrasion and mar damage to transparent materials. Following the procedure described in test method ASTM D1044, 100mm square flat specimens are subjected to rotary rubbing action under controlled conditions of pressure and abrasive action. The test specimen, mounted on a turntable platform, turns on a vertical axis, against the sliding rotation of two abrading wheels. Resistance to abrasion is evaluated by using a Hazemeter to measure the change in haze. Despite its popularity with glass and plastic producers, the Rotary Abraser does not permit an operator to test contoured parts or specimens smaller than 100mm square. Thus, for finished product such as handheld devices or

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