Permissible Tolerances as per IS 3129-1985:
Permissible Tolerance for Length:
According to IS 3129-1985, the permissible tolerance for the length of finished boards is ±6 mm. This ensures that the boards meet certain dimensional standards required for their application.
Other Important Specifications:
 Thickness Tolerance:
• The standard allows a thickness tolerance of ±5 percent for boards.
Width Tolerance:
• The permissible tolerance for the width of finished boards is ±3 mm.
Edge Straightness and Squareness:
• Edge straightness: 2 mm per 1000 mm or 0.2 percent.
• Squareness: 2 mm per 1000 mm or 0.2 percent.