铅笔硬度测试仪的铅笔
型号MTM006
描述：
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测试是非常简单的，将给出均匀的结果，并且是可靠的，因为铅笔被评分。铅笔的等级由其组合物中的烘焙石墨和粘土的量决定。
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分级铅笔有各种各样的硬度和柔软，并且可以在大多数艺术品或办公室供应商店找到。
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一组由十二个铅笔,不等in hardness from 4H to 6B. The 'H' stands for hardness, the 'B' stands for blackness, and HB is for hard and black pencils. The hardest is a 9H, followed by 8H, 7H, 6H, 5H, 4H, 3H, 2H, and H. F is the middle of the hardness scale; then comes HB, B, 2B, 3B, 4B, 5B, 6B, 7B, 8B, and 9B, which is the softest. Another grading method uses numbers; the equivalents would be #1=B, #2=HB, #2-1/2=F, #3=H, and #4=2H. The most commonly used writing pencil is the #2 (HB grade), which is fairly soft, contains more graphite, and leaves a dark mark.
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To do your own pencil hardness testing, always start with a dry, clean, well-sanded piece of wood.
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The pencil hardness test is only one of many tests that are done to evaluate a coating's performance.
