Commercial Tolerances

Sheet Rubber & Diaphragm Sheet as published in Rubber Manufacturers Association, Sheet Rubber Handbook, dated 1980 

Thickness Tolerances*
Nominal Thickness Tolerances (Plus or Minus)
Inches Millimeters Inches Millimeters
Fractions Decimals
Under 1/32 Under 0.031 Under 0.79 0.010 0.25
1/32 to but not including 1/16 0.031 to 0.062 0.79 to 1.59 0.012 0.30
1/16 to but not including 1/8 0.062 to 0.125 1.59 to 3.18 0.016 0.40
1/8 to but not including 3/16 0.125 to 0.187 3.18 to 4.8 0.020 0.51
3/16 to but not including 3/8 0.187 to 0.375 4.8 to 9.5 0.031 0.79
3/8 to but not including 9/16 0.375 to 0.562 9.5 to 14.3 0.047 1.19
9/16 to but not including 3/4 0.562 to 0.750 14.3 to 19.2 0.062 1.59
3/4 to but not including 1 0.750 to 1.000 19.2 to 25.4 0.094 2.38
1 and over 1.000 and over 25.4 10% 10%

Note – Material made by the coating process is subject to considerably more restrictive tolerances:under 0.031″ (0.79 mm), ± 0.003″ (± 0.08 mm); 0.031″ (0.79 mm) and over, ± 10%

 Thickness Tolerances*
 Nominal Thickness  Tolerances (Plus or Minus)
 Inches  Millimeters  Inches  Millimeters
 36 and over  915 and over  1  25.4

It is recommended that the minimum length of a piece included in a roll be 10 feet or 3 meters. Rolls may be supplied in more than one piece. Slabs are usually supplied in one piece.