Extrusions

 

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 rubber, foam and sponge from a variety of compounds to meet your specific environment and application. These compounds include Nitrile, Natural, 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 Lenth 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
-

 

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Table 13. Standaed Cross-Sectional Tolerance
RMA Class
1
High Precision		 2
Precision		 3
Commercial
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
High Precision		 2
Precision		 3
Commercial
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
1.039 0.063 0.098
1.051 0.079 0.126

 

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Table 16. Cut Lenth tolerance for unspliced extrusion
RMA Class
1
High Precision		 2
Precision		 3
Commercial
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 +0.04 +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
0.8 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
High Precision		 2
Precision		 3
Commercial
Drawing Designation
S1 S2 S3
Millimeters  
Above Up to
0 250
250 400
400 630
1000 1600
1600 2500
2500 over
+302 +3.2 +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
012.5 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

 

[Back to Tables Index]

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 +0.08 +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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