LensGuard 504 Eyewear Hardcoat Mid Bayer - Non Tintable BRILLIANT THINKING INNOVATIVE COATINGS TECHNICAL DATA (PC) Bayer Ratio (a) 5.50 Steel Wool Scratch Resistance (b) 4 psi Taber Abrasion Test (ASTM1044) (c) 100 cycles — 3.40 500 cycles — 5.20 Pencil Hardness Test (ASTM D 3363, modified) (d) F (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 PDF Download Optical Coatings All Coatings