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- Page 1 PAUL N GARDNER COMPANY PAUL N GARDNER COMPANY EMAIL: GARDCO@ALTANA.COM 9104 GUILFORD ROAD, SUITE H 9104 GUILFORD ROAD, SUITE H EMAIL GARDCO@ALTANA.COM COLUMBIA, MD 21046 USA COLUMBIA, MD 21046 USA PHONE: +1-954-946-9454 PHONE +1-954-946-9454...
- Page 2 Pencil Hardness Tester Quick Start Manual INSTRUCTIONS FOR USE 1. For the pencil hardness test, reference ASTM D3363, pencils of increasing hardness values are moved over the surface in a precisely defined way until one lead damages the surface. Surface Hardness is defined by the hardest pencil grade which just fails to damage the surface.
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