Selecting the right seal or gasket for a specific application involves knowing the answers to many questions about what your requirements might be. To help you in this process, the following tables are available for you.
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|
RMA Table 3 - Molded A2 Precision
|
Size (mm) |
Fixed |
Closure |
Size (in) |
Fixed |
Closure | ||||
|
Above |
-- |
Including |
|
|
Above |
-- |
Including |
|
|
|
0 |
-- |
10 |
+/-.16 |
+/- .20 |
0 |
-- |
.40 |
+/- .006 |
+/- .008 |
|
10 |
-- |
16 |
.20 |
.25 |
.40 |
-- |
.63 |
.008 |
.010 |
|
16 |
-- |
25 |
.25 |
.32 |
.63 |
- |
1.00 |
.010 |
.013 |
|
25 |
-- |
40 |
.32 |
.40 |
1.00 |
-- |
1.60 |
.013 |
.016 |
|
40 |
-- |
63 |
.40 |
.50 |
1.60 |
-- |
2.50 |
.016 |
.020 |
|
63 |
-- |
100 |
.50 |
.63 |
2.50 |
-- |
4.00 |
.020 |
.025 |
|
100 |
-- |
160 |
.63 |
.80 |
4.00 |
-- |
6.30 |
.025 |
.032 |
|
160 |
-- |
& over |
|
|
6.30 |
-- |
& over |
|
|
|
|
multiply by |
.004 |
.005 |
|
multiply by |
.004 |
.005 | ||
RMA Table 13 - Dense Cross Section Organic/Silicone Class 2 Precision
| RMA Class |
1 High Precision |
2 Precision |
3 Commercial | ||
| Drawing Designation |
E1 |
E2 |
E3 | ||
| Dimensions (mm) | |||||
|
Above |
- |
Up to |
|
|
|
|
0 |
|
1.5 |
+/- 0.15 |
+/- 0.25 |
+/- 0.40 |
|
1.5 |
|
2.5 |
0.20 |
0.35 |
0.50 |
|
2.5 |
|
4.0 |
0.25 |
0.40 |
0.70 |
|
4.0 |
|
6.3 |
0.35 |
0.50 |
0.80 |
|
6.3 |
|
10 |
0.40 |
0.70 |
1.00 |
|
10 |
|
16 |
0.50 |
0.80 |
1.30 |
|
16 |
|
25 |
0.70 |
1.00 |
1.60 |
|
25 |
|
40 |
0.80 |
1.30 |
2.00 |
|
40 |
|
63 |
1.00 |
1.60 |
2.50 |
|
63 |
|
100 |
1.30 |
2.00 |
3.20 |
|
RMA Class |
1 High Precision |
2 Precision |
3 Commercial | ||
|
Drawing Designation |
E1 |
E2 |
E3 | ||
|
Dimensions (in) |
|
|
| ||
|
Above |
- |
Up to |
|
|
|
|
0 |
|
0.06 |
+/- 0.006 |
+/- 0.010 |
+/- 0.015 |
|
0.06 |
|
0.10 |
0.008 |
0.014 |
0.020 |
|
0.10 |
|
0.16 |
0.010 |
0.016 |
0.027 |
|
0.16 |
|
0.25 |
0.014 |
0.020 |
0.031 |
|
0.25 |
|
0.39 |
0.016 |
0.027 |
0.039 |
|
0.39 |
|
0.63 |
0.020 |
0.039 |
0.063 |
|
0.63 |
|
0.98 |
0.027 |
0.039 |
0.063 |
|
0.98 |
|
1.57 |
0.031 |
0.051 |
0.079 |
|
1.57 |
|
2.48 |
0.039 |
0.063 |
0.098 |
|
2.48 |
|
3.94 |
0.051 |
0.079 |
0.126 |
Note: Tolerances on dimensions above 100mm (3.94) should be agreed upon by supplier and user. General cross-sectional dimensions below 1mm (0.04) are impractical. In general, softer materials and those requiring a post cure need greater tolerances.
RMA Table 16 - Dense Cut Length L2 Commercial
| RMA Class |
1 Precision |
2 Commercial |
3 Non-Critical | ||
| Drawing Designation |
L1 |
L2 |
L3 | ||
| Length (mm) | |||||
|
Above |
- |
Up to |
|
|
|
|
0 |
|
40 |
+/- 0.7 |
+/- 1.0 |
+/- 1.6 |
|
40 |
|
63 |
0.8 |
1.3 |
2.0 |
|
63 |
|
100 |
1.0 |
1.6 |
2.5 |
|
100 |
|
160 |
1.3 |
2.0 |
3.2 |
|
160 |
|
250 |
1.6 |
2.5 |
4.0 |
|
250 |
|
400 |
2.0 |
3.2 |
5.0 |
|
400 |
|
630 |
2.5 |
4.0 |
6.3 |
|
630 |
|
1000 |
3.2 |
5.0 |
10.0 |
|
1000 |
|
1600 |
4.0 |
6.3 |
12.5 |
|
1600 |
|
2500 |
5.0 |
10.0 |
16.0 |
|
2500 |
|
4000 |
6.3 |
12.5 |
20.0 |
|
4000 |
|
|
0.16% |
0.32% |
0.50% |
|
Length (in) |
|
|
| ||
|
Above |
- |
Up to |
|
|
|
|
0 |
|
1.6 |
+/- 0.03 |
+/- 0.04 |
+/- 0.06 |
|
1.6 |
|
2.5 |
0.03 |
0.05 |
0.08 |
|
2.5 |
|
4.0 |
0.04 |
0.06 |
0.10 |
|
4.0 |
|
6.3 |
0.05 |
0.08 |
0.13 |
|
6.3 |
|
10.0 |
0.06 |
0.10 |
0.16 |
|
10.0 |
|
16.0 |
0.08 |
0.13 |
0.20 |
|
16.0 |
|
25.0 |
0.10 |
0.16 |
0.25 |
|
25.0 |
|
40.0 |
0.13 |
0.20 |
0.40 |
|
40.0 |
|
63.0 |
0.16 |
0.25 |
0.50 |
|
63.0 |
|
100.0 |
0.20 |
0.40 |
0.63 |
|
100.0 |
|
160.0 |
0.25 |
0.50 |
0.80 |
|
160.0 |
|
|
0.16% |
0.32% |
0.50% |
Note: Special consideration of tolerances will have to be given to both extremely soft and high tensile stocks.
RMA Table 35 - Length and Width Die Cut Sponge #2, BL2
| RMA Class |
1 |
2 |
3 |
| RMA Drawing Designation |
BL1 |
BL2 |
BL3 |
| Millimeters |
|
Tolerance |
|
| For thickness up to 6.3mm* | |||
| under 25 |
+/- 0.63 |
+/- 0.80 |
+/- 1.0 |
| 25 to 160 |
0.80 |
1.0 |
1.25 |
| over 160 multiply by |
0.0063 |
0.01 |
0.016 |
| For thickness over 6.3 to 12.5mm* |
|
|
|
| under 25 |
+/- 0.81 |
+/- 1.0 |
+/- 1.25 |
| 25 to 160 |
1.0 |
1.25 |
1.6 |
| over 160 multiply by |
0.0063 |
0.01 |
0.016 |
| For thickness over 12.5mm* |
|
|
|
| under 25 |
+/- 1.0 |
+/- 1.25 |
+/- 1.6 |
| 25 to 160 |
1.25 |
1.6 |
2.0 |
| over 160 multiply by |
0.0063 |
0.01 |
0.016 |
| Inches |
|
Tolerance |
|
| For thickness up to .25in* |
|
|
|
| under 1.0 |
+/- .025 |
+/- .032 |
+/- .040 |
| 1.0 to 6.3 |
.032 |
.040 |
.050 |
| over 6.3 multiply by |
0.0063 |
0.010 |
0.016 |
| For thickness over .25 to .50in* |
|
|
|
| under 1.0 |
+/- .032 |
+/- .040 |
+/- .050 |
| 1.0 to 6.3 |
.040 |
.050 |
.063 |
| over 6.3 multiply by |
0.0063 |
0.010 |
0.016 |
| For thickness over .50in* |
|
|
|
| under 1.0 |
+/- .040 |
+/- .050 |
+/- .063 |
| 1.0 to 6.3 |
.050 |
.063 |
.080 |
| over 6.3 multiply by |
0.0063 |
0.010 |
0.016 |
* Separate schedules of length and width tolerances are listed for different thickness of these materials because of the
"dish" effect in die-cutting. This is more noticeable as the thickness increases. As shown in the drawing below, the
"dish" effect is a concavity of die-cut edges (due to the squeezing of the material by the pressure of the cutting die).
Figure
| The width "W" (or length) at the top and bottom surface are slightly greater than the width "W-X" at the center |
 |
| Note: Class 1 tolerances should not be applied to the softer grades of material, below 63 kPa (9 psi) |
RMA Table 36 - Sponge Cross Section Organic/Silicone #1, BEC 1
| RMA Class |
1* |
2 |
3 | ||
| RMA Drawing Designation |
BEC1 |
BEC2 |
BEC3 | ||
| Millimeters |
|
Tolerance |
| ||
|
Above |
- |
Up to |
|
|
|
|
0 |
|
6.3 |
+/- 0.4 |
+/- 0.5 |
+/- 0.63 |
|
6.3 |
|
12.5 |
.063 |
1.0 |
1.25 |
|
12.5 |
|
25.0 |
1.25 |
2.0 |
2.5 |
|
25.0 |
|
40.0 |
2.0 |
3.2 |
4.0 |
|
40.0 & over multiply by |
0.06 |
0.08 |
0.10 | ||
|
RMA Class |
1* |
2 |
3 | ||
|
RMA Drawing Designation |
BEC1 |
BEC2 |
BEC3 | ||
|
Inches |
|
Tolerance |
| ||
|
Above |
- |
Up to |
|
|
|
|
0 |
|
.25 |
+/- .016 |
+/- 0.20 |
+/- .025 |
|
.25 |
|
.50 |
.025 |
.040 |
.050 |
|
.50 |
|
1.0 |
.050 |
.080 |
.100 |
|
1.0 |
|
1.6 |
.080 |
.125 |
.160 |
|
1.6 & over multiply by |
0.060 |
0.080 |
0.100 | ||
*Class 1 tolerances should not be applied to softer grades of material - below 63 kPa (9 psi) compression deflection.
RMA Table 38 - Cut Length #1, BEL 1
| RMA Class |
1* |
2 |
3 | ||
| RMA Drawing Designation |
BEL1 |
BEL2 |
BEL3 | ||
| Millimeters |
|
Tolerance |
| ||
|
Above |
- |
Including |
|
|
|
|
0 |
|
80 |
+/- 1.6 |
+/- 1.6 |
+/- 3.2 |
|
80 |
|
160 |
3.2 |
3.2 |
6.3 |
|
160 |
|
315 |
6.3 |
6.3 |
12.5 |
|
315 |
|
630** |
multiply by .02 |
12.5 |
25.0 |
|
630 |
|
1250** |
multiply by .02 |
25.0 |
50.0 |
|
1250 &over multiply by |
0.02 |
0.03 |
.040 | ||
| RMA Class |
1 |
2 |
3 | ||
| RMA Drawing Designation |
BEL1 |
BEL2 |
BEL3 | ||
| Inches |
|
Tolerance |
| ||
|
Above |
- |
Including |
|
|
|
|
0 |
|
3.15 |
+/- .063 |
+/- .063 |
+/- .125 |
|
3.15 |
|
6.3 |
.125 |
.125 |
.250 |
|
6.3 |
|
12.5 |
.250 |
.250 |
.500 |
|
12.5 |
|
25** |
multiply by .02 |
.500 |
1.000 |
|
24.0 |
|
50** |
multiply by .02 |
1.000 |
2.000 |
|
50.0 & over multiply by |
0.02 |
0.030 |
0.040 | ||
* Class 1 tolerances should not be applied to the softer grades of material - below 63 kPa (9 psi) compression deflection.
** Acute measurement of long lengths is difficult because these materials stretch or compress easily. Where close tolerances
are required on long lengths, a specific technique of measurement should be agreed upon between purchaser and manufacturer.
