According to the nature and use can be divided into graphite pencils, color pencils, special pencils 3 categories. Graphite pencil pencil core Graphite as the main raw material pencil. Available for drawing and general writing use. Graphite lead core hardness mark, generally with "H" Indicates a hard pencil, "B" indicates a soft pencil, "HB" indicates a soft and hard pencil, and "F" indicates a pencil between HB and H.
Graphite pencils are divided into 18 hardness levels: 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H, 9H, 10H, etc. Large, respectively, indicating that the harder or softer. In addition there are 7B, 8B, 9B3 levels of soft pencils, to meet the special needs of painting and other special needs. Color pencil lead pencils with colored pencils. Lead by clay, pigments, talcum powder , adhesives, grease and wax, etc.
Used for marking symbols, drawing, drawing charts, maps, etc. Color pencils are usually packaged (6, 12, 24, 36, 64 colors). Special pencils include glass pencils, color pencils, charcoal pencils, blueprint pencils, Watercolor pencils, pastel pencils, etc. They have their own special uses.
1 Glass Pencil: The lead core consists of pigments, greases, and waxes. It is used to write or mark on surfaces such as glass, metal, enamel, ceramics, leather, plastics, and plexiglass, for industrial, pharmaceutical, defense, and surveying departments. Use. Red, white, orange, yellow, purple, dark green, light blue, black and other colors.
2 color pencils: commonly known as copy pencils. Lead core contains sun-resistant Qinglian Lake and other dyes, writing with the eraser can not afford to use, is suitable for writing long-term preservation of important documents, accounting records. There Qinglian, red, blue, green , yellow and other colors, mostly Qinglian.
3 charcoal drawing pencil: also known as carbon pencil. Lead core made of clay, charcoal powder, carbon black, etc. used for painting, oil painting primer.
4 blueprint pencil: also known as tracing pencil. graphite lead core with oil-soluble wax red and other red dye processing, in order to play a role in shading, used for direct drawing after drawing.
5 watercolor pencil: lead core plus acid dyes such as water-soluble acidic red. When the lead core is wet, it is like a watercolor paint, used for photo coloring, sketching, mapping, statistical charts and so on.
6 pastel pencil: lead core made of pigment and porous soft raw materials (such as calcium carbonate), free of grease and wax. Its hardness and writing feel similar to chalk. Used for painting.
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