The scale runs from at less than 6B (VERY soft) and gets slightly harder with each step up, going to 5B, 4B, 3B, 2B, B, HB, H, 2H, 3H, 4H, 5H, 6H, 7H, 9H, 10H, 11H and 12H that I know of. 6B is softer that most scrap lead, while 12H will cut into some grades of aluminum and copper, which are far harder than most lead alloys.
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Continued Test Type Viscoelastic Properties Unexposed films Tensile strength Elongation Stiffness Blistering Immersed panels Weathered panels Chalking Weathered panels Pencil Hardness Unexposed panels 10 min. after immersion 120 min. after immersion Total Number of Results Expected per Lab 90 90 90 66 87 87 144 96 60 1974 Number of Valid
Utech, Bob - Guide to High-Performance Powder Coating Material Safety Data Sheets (MSDS) Government regulations resulted in growth of the custom coat-ing industry. Poor Poor Very good Excellent Very good Pencil hardness HB7H H2H HB3H HB6H 2H3H 20 . Direct impact resistance 60160 80160 60160 60160 20140
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Feb 22, 2010 · Picked up a set of 10 artist pencils for $8.50 in . It contained an 8B, 6B , 4B, 3B, 2B, B, HB, F, 1H, 2H, 3H and 4H. Tested a few things I had laying around just for grins. Egg sinkers I cast from lead sheet that I think is nearly pure lead- 8B Bullet I cast from Clip on WW- 3B