HARD ANODIZE 

• Color will vary from light tan to black depending on alloy and thickness. 
• Coating PENETRATES base metal as much as builds up on the surface.
• The term THICKNESS Includes both the buildup and penetration. 
• Provides very hard ceramic type coating. 
• Abrasion resistance will vary with alloy and thickness of coating. 
• Good dielectric properties. 
• Corrosion resistance is good, but recommend seal hard anodize In 5% dichromate solution where increased corrosion resistance is required. Where extreme abrasion resistance is required do not seal as some softening is encountered. 

SULFURIC ANODIZE

• Color will vary with alloy. 
• Aluminum with low alloying elements will show practically no color change. 
• Best coating on aluminum for dyeing. 
• Can be dyed practically any color or shade (Black, blue, red, etc.). 
• Salt spray requirement is 336 hours 5% solution per method 811 of FED-STD-No. 151. 
• Minimum weight for Type 11 coatings: Class 1 600 Milligrams/sq. it, Class 2 2500 Milligrams/sq. ft.

IRIDITE / ALODINE

• Materials qualified produce coatings that range in color from clear to iridescent yellow or brown. Inspection difficulties may arise with clear coatings because visual inspection 
• For maximum protection against corrosion, for surfaces to be painted or left unpainted. 
• Class 3 chemical coatings are intended as a corrosion pre- ventive film for electrical and electronic applications.