Laminate Sheet Tolerances

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Acculam Sheet Thickness Tolerances
Nominal Thickness All
Glass Grades
All
Paper Grades
CE
Canvas Grade
C
Canvas Grade
LE
Linen Grade
L
Linen Grade
fractions inches mm inches mm inches mm inches mm inches mm inches mm inches mm
+ / - + / - + / - + / - + / - + / -
0.010 0.254 0.0020 0.0508 0.0020 0.0508 - - - - - - 0.0030 0.0762
1/64 0.015 0.381 0.0030 0.0762 0.0025 0.0635 - - - - 0.0035 0.0889 0.0035 0.0889
0.020 0.508 0.0040 0.1016 0.0030 0.0762 - - - - 0.0040 0.1016 0.0040 0.1016
0.025 0.635 0.0050 0.1270 0.0035 0.0889 0.0050 0.1270 - - 0.0045 0.1143 0.0045 0.1143
1/32 0.031 0.787 0.0065 0.1651 0.0035 0.0889 0.0065 0.1651 0.0065 0.1651 0.0050 0.1270 0.0050 0.1270
3/64 0.047 1.194 0.0075 0.1905 0.0045 0.1143 0.0075 0.1905 0.0075 0.1905 0.0055 0.1397 0.0055 0.1397
+ / - + / - + / - + / - + / - + / -
1/16 0.062 1.575 0.0075 0.1905 0.0050 0.1270 0.0075 0.1905 0.0075 0.1905 0.0060 0.1524 0.0060 0.1524
3/32 0.093 2.362 0.0090 0.2286 0.0070 0.1778 0.0090 0.2286 0.0090 0.2286 0.0070 0.1778 0.0070 0.1778
1/8 0.125 3.175 0.0120 0.3048 0.0080 0.2032 0.0100 0.2540 0.0100 0.2540 0.0080 0.2032 0.0080 0.2032
5/32 0.156 3.962 0.0150 0.3810 0.0090 0.2286 0.0120 0.3048 0.0120 0.3048 0.0090 0.2286 0.0090 0.2286
3/16 0.187 4.750 0.0190 0.4826 0.0100 0.2540 0.0125 0.3175 0.0125 0.3175 0.0100 0.2540 0.0100 0.2540
7/32 0.219 5.563 0.0210 0.5334 0.0110 0.2794 0.0140 0.3556 0.0140 0.3556 0.0110 0.2794 0.0110 0.2794
+ / - + / - + / - Plus Only + / - Plus Only
1/4 0.250 6.350 0.0220 0.5588 0.0120 0.3048 0.0150 0.3810 0.0300 0.7620 0.0120 0.3048 0.0240 0.6096
5/16 0.312 7.925 0.0260 0.6604 0.0140 0.3556 0.0170 0.4318 0.0350 0.8890 0.0145 0.3683 0.0290 0.7366
3/8 0.375 9.525 0.0300 0.7620 0.0170 0.4318 0.0200 0.5080 0.0400 1.0160 0.0170 0.4318 0.0340 0.8636
7/16 0.438 11.125 0.0330 0.8382 0.0190 0.4826 0.0220 0.5588 0.0440 1.1176 0.0190 0.4826 0.0380 0.9652
1/2 0.500 12.700 0.0360 0.9144 0.0210 0.5334 0.0240 0.6096 0.0480 1.2192 0.0210 0.5334 0.0420 1.0668
5/8 0.625 15.875 0.0400 1.0160 0.0240 0.6096 0.0270 0.6858 0.0530 1.3462 0.0240 0.6096 0.0480 1.2192
+ / - + / - + / - Plus Only + / - Plus Only
3/4 0.750 19.050 0.0430 1.0922 0.0270 0.6858 0.0290 0.7366 0.0580 1.4732 0.0270 0.6858 0.0540 1.3716
7/8 0.875 22.225 0.0460 1.1684 0.0300 0.7620 0.0310 0.7874 0.0620 1.5748 0.0300 0.7620 0.0600 1.5240
1 1.000 25.400 0.0490 1.2446 0.0330 0.8382 0.0330 0.8382 0.0650 1.6510 0.0330 0.8382 0.0650 1.6510
1 1/8 1.125 28.575 0.0530 1.3462 0.0350 0.8890 0.0350 0.8890 0.0690 1.7526 0.0350 0.8890 0.0690 1.7526
1 1/4 1.250 31.750 0.0550 1.3970 0.0370 0.9398 0.0370 0.9398 0.0730 1.8542 0.0370 0.9398 0.0730 1.8542
1 3/8 0.375 34.925 0.0580 1.4732 0.0390 0.9906 0.0390 0.9906 0.0770 1.9558 0.0390 0.9906 0.0770 0.1.9558
+ / - + / - + / - Plus Only + / - Plus Only
1 1/2 1.500 38.100 0.0610 1.5494 0.0410 1.0414 0.0410 1.0414 0.0810 2.0574 0.0410 1.0414 0.0820 2.0828
1 5/8 1.625 41.275 0.0640 1.6256 0.0430 1.0922 0.0430 1.0922 0.0850 2.1590 0.0430 1.0922 0.0850 2.1590
1 3/4 1.750 44.450 0.0670 1.7018 0.0450 1.1430 0.0450 1.1430 0.0890 2.2606 0.0450 1.1430 0.0890 2.2606
1 7/8 1.875 47.625 0.0700 1.7780 0.0470 1.1938 0.0470 1.1938 0.0930 2.3622 0.0470 1.1938 0.0930 2.3622
2 2.000 50.800 0.0730 1.8542 0.0490 1.2446 0.0490 1.2446 0.0970 2.4638 0.0490 1.2446 0.0970 2.4638
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Maximum Warp & Twist Sheet Tolerances
Nominal Thicknesses
from - to
Maximum
warp & twist
inches mm %
.031" - .062" .787 - 1.575 5.00%
.063" - .125" 1.600 - 3.175 2.50%
.126" .250" 3.200 - 6.350 1.00%
.251" - .750" 6.375 - 19.050 0.50%
.751" - Max. 19.075 - Max. 0.25%
For the method of measuring warp and twist,
refer to ASTM D-229.

Sheet Tolerance Thickness:
At least 90% of the area of the sheet shall be within the tolerances listed above.

Sheet Tolerance Length and Width:
The length and width of the manufactured sheet will be within +/- 1.000" \ 25.4mm of the nominal sheet size.

Sheet Tolerance Warp and Twist:
In case of warp, the % is stated in terms of the lateral dimension (length or width).
In the case of twist, the % is stated in terms of the dimension from one corner to the diagonally opposite corner.

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