Extrusions

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EXTRUDED RUBBER


The use of extruded seals is extremely diverse. You will find extrusions in many types of manufacturing processes for a variety of purposes. Applications include, but are not limited to: door and window seals in the architectural environment and automotive, appliance and aircraft industries; bearing seals; bumpers; heater gaskets; radiator overflow tubing; vacuum cleaner belts; ladder foot grips, and cushions on bars or handles. The applications are endless and expanding rapidly with innovative engineering of extrudable materials.

Materials which can be extruded include dense and sponge rubber from a variety of compounds to meet your specific environment and application. These compounds include Nitrile, EPDM, Natural rubber, Neoprene, Viton®, Urethane, Silicone and many others. Whether your application requires a long or short run, Vedovell will service your needs with the appropriate compound.

Extrusions can be diversified for use by many secondary operations such as cut lengths, vulcanized to be endless, and formed and notched to allow a variety of shapes and sizes of products.

Most extrusions are custom profiles which are tooled to meet your blueprint requirements. This is an extremely competitive method of manufacturing due to reasonable tooling costs. There are also standard cord (rod), tubing and channels available.

The tolerance tables in the following pages have been developed by the Rubber Manufacturers Association to assist in your design work.

Tables Index
Table 12. Summary of RMA Drawing Designations Extended Rubber Products
Table 13. Standard Cross-Sectional Tolerance
Table 16. Cut Length tolerance for unspliced extrusion
Table 18. Spliced Length Tolerances
Table 20. Tolerances on Internal Dimensions of Mandrel-Supported Extrusions

Table 12. Summary of RMA Drawing Designations
Extended Rubber Products
RMA Class Dimensional
Tolerance*
Table 13		 Cut Length
Tolerance*
Table 16		 Spliced Length
Tolerance*
Table 16		 Mandrel Cured*
Table 20
1
2
3
4		 E1
E2
E3
-		 L1
L2
L3
-		 S1
S2
S3
-		 EN1
EN2
EN3
-

* As noted in the purpose and scope, certain statements and tables in this chapter have been changed to reflect current industry practices and to agree with the International Standard ISO 3302-1988, RUBBER-DIMENSIONAL TOLERANCES FOR USE WITH PRODUCTS.

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Table 13. Standard Cross-Sectional Tolerance
RMA Class
1
Precision
2
Commercial
3
Non-critical
Drawing Designation
E1
E2
E3
Dimensions (in Millimeters)  
Above Up to
0 1.5
1.5 2.5
2.5 4.0
4.0 6.3
6.3 10
10 16
16 25
25 40
40 63
63 100
+0.15
+0.25
+0.40
0.20
0.35
0.50
0.25
0.40
0.70
0.35
0.50
0.80
0.40
0.70
1.00
0.50
0.80
1.30
0.70
1.00
1.60
0.80
1.30
2.00
1.00
1.60
2.50
1.30
2.00
3.20
RMA Class
1
Precision
2
Commercial
3
Non-critical
Drawing Designation
E1
E2
E3
Dimensions (in Inches)  
Above
Up to
0
0.06
0.06
0.10
0.10
0.16
0.16
0.25
0.25
0.39
0.39
0.63
0.63
0.98
0.98
1.57
1.57
2.48
2.48
3.94
+0.006
+0.010
+0.015
0.008
0.014
0.020
0.010
0.016
0.027
0.014
0.020
0.031
0.016
0.027
0.039
0.020
0.031
0.051
0.027
0.039
0.063
0.031
0.051
0.079
0.039
0.063
0.098
0.051
0.079
0.126

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Table 16. Cut Length Tolerance for Unspliced Extrusion
RMA Class
1
Precision
2
Commercial
3
Non-critical
Drawing Designation
L1
L2
L3
Length (in Millimeters)  
Above
Up to
0
40
40
63
63
100
100
160
160
250
250
400
400
630
630
1000
1000
1600
1600
2500
2500
4000
4000
 
+0.7
+1.0
+1.6
0.08
1.3
2.0
1.0
1.6
2.5
1.3
2.0
3.2
1.6
2.5
4.0
2.0
3.2
5.0
2.5
4.0
6.3
3.2
5.0
10.0
4.0
6.3
12.5
5.0
10.0
16.0
6.3
12.5
20.0
0.16%
0.32%
0.50%
Length (in Inches)  
Above
Up to
0
1.6
1.6
2.5
2.5
4.0
4.0
6.3
6.3
10.0
10.0
16.0
16.0
25.0
25.0
40.0
40.0
63.0
63.0
100.0
100.0
160.0
160.0
 
+0.03
+0.04
+0.06
0.03
0.05
0.08
0.04
0.06
0.10
0.05
0.08
0.13
0.06
0.10
0.16
0.08
0.13
0.20
0.10
0.16
0.25
0.13
0.20
0.40
0.16
0.25
0.50
0.20
0.40
0.63
0.25
0.50
0.80
0.16%
0.32%
0.50%

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Table 18. Spliced Length Tolerances
RMA Class
1
Precision
2
Commercial
3
Non-critical
Drawing Designation
S1
S2
S3
Millimeters  
Above
Up to
0
250
250
400
400
630
630
1000
1000
1600
1600
2500
+3.2
+6.3
+7.1
4.0
7.1
8.0
5.0
8.0
9.0
6.3
9.0
10.0
8.0
10.0
11.2
10.0
11.2
12.3
12.5
12.5
16.0
Inches  
Above
Up to
0
10
10
16
16
25
25
40
40
63
63
100
100 over
+.13
+.25
+.28
.16
.28
.32
.20
.32
.36
.25
.36
.40
.32
.40
.45
.40
.45
.50
.50
.50
.53

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Table 20. Tolerances on Internal Dimensions of Mandrel-Supported Extrusions
RMA Class
1
(High Precision)
2
(Commercial)
3
(Non-Critical)
Drawing Designation
EN1
EN2
EN3
Nominal Dimensions
(in Millimeters)
Above
Up to
0
4
4
6.3
6.3
10
10
16
16
25
25
40
40
63
63
100
100
160
160
 
+0.20
+0.20
+0.35
0.20
0.25
0.40
0.25
0.35
0.50
0.35
0.40
0.70
0.40
0.50
0.80
0.50
0.70
1.00
0.70
0.80
1.30
0.80
1.00
1.60
1.00
1.30
2.00
0.6%
0.8%
1.2%
Nominal Dimensions
(in Inches)		  
Above
Up to
0
0.16
0.16
0.25
0.25
0.40
0.40
0.63
0.63
1.00
1.00
1.60
1.60
2.50
2.50
4.00
4.00
6.30
6.30
 
+0.008
+0.008
+0.014
0.008
0.010
0.016
0.010
0.014
0.020
0.014
0.016
0.028
0.016
0.020
0.032
0.020
0.028
0.040
0.028
0.032
0.051
0.032
0.040
0.063
0.040
0.051
0.079
0.6%
0.8%
1.2%

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Published by The Rubber Manufacturers Association, Inc.
1400 K Street, N.W. Suite 900
Washington D.C. 20005
www.rma.org

All rights reserved. The contents of this publication may not be reprinted or otherwise reproduced in any form without the express written permission of RMA.
Copyrighted, The Rubber Manufacturers Association, Inc., 2005

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