Bayer Ratio (a)	1.50
Steel Wool Scratch Resistance (b)	24 psi
Taber Abrasion Test (ASTM1044) (c)	PC: 100 cycles — 2.70
	PC: 500 cycles — 4.25
	PMMA: 100 cycles — 2.50
	PMMA: 500 cycles — 3.50
Pencil Hardness Test (ASTM D 3363, modified) (d)	PC: 2H
	PMMA: 8H

(a)-500 g of abrasive media, 600 cycles
(b)-steel wool #0000, 5 rotations, no scratch
(c)-500 g, CS 10 wheels
(d)-Mitsu-Bishi Hi Uni pencils, Wolf-Wilburn Method — 1000 g @ 45 degrees