Drawing Pencils:
A pencil is utilized for preparing a drawing on a sheet of paper. The appearance and accuracy of a drawing depends on the quality of the pencil utilized. Pencils are of different grades and they are easily recognized with the letters marked on them. The description of various grades of pencils, according to BIS, is specified in table underneath as:
|
Grade of Pencil
|
Hardness
|
|
6H, 5H, 4H
|
Extremely hard
|
|
3H
|
Very hard
|
|
2H
|
Hard
|
|
H
|
Moderately hard
|
|
F
|
Firm
|
|
HB
|
Medium
|
|
B
|
Moderately soft & black
|
|
2B
|
Soft and black
|
|
3B
|
Very soft and black
|
|
4B, 5B, 6B
|
Very soft and very black
|
Generally, hard pencils as like H, 2H, etc. are utilized for creation engineering drawings, although for the reason of lettering and sketching soft pencils as like HB or H, etc. are used. As complicated drawings insist fine lines and minute details, harder pencils as like4H, 5H, 6H, must be used for this reason.