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RMA TOLERANCES FOR CUTTING TO LENGTH EXTRUSIONS

 
   
   

Unspliced extrusions are classified as those that generally require only extruding, vulcanizing and cutting to length. They are of various cross sectional designs and do not include lathe cut parts, formed tubing, or precision ground and cut parts. They are generally packed in a straight or coiled condition after being measured and cut to length.

The following tables are to be used to convey to the manufacturer the limits that are designed by the purchaser.

It should be understood by the design engineers that due to the stretch factor in rubber, a period of conditioning at room temperature must be allowed before measurements for length are taken. A specific technique of measurement should be agreed upon between the purchaser and manufacturer.

RMA Class

1
(Precision)
2
(Commercial)
3
(Non-Critical)

Drawing Designation

L1 L2 L3
Dimensions (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
± 0.8
± 1.0
± 1.3
± 1.6
± 2.0
± 2.5
± 3.2
± 4.0
± 5.0
± 6.3
± 0.16%
 
± 1.0
± 1.3
± 1.6
± 2.0
± 2.5
± 3.2
± 4.0
± 5.0
± 6.3
± 10.0
± 12.5
± 0.32%
 
± 1.6
± 2.0
± 2.5
± 3.2
± 4.0
± 5.0
± 6.3
± 10.0
± 12.5
± 16.0
± 20.0
± 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
± 0.03
± 0.04
± 0.05
± 0.06
± 0.08
± 0.10
± 0.13
± 0.16
± 0.20
± 0.25
± 0.16%
 
± 0.04
± 0.05
± 0.06
± 0.08
± 0.10
± 0.13
± 0.16
± 0.20
± 0.25
± 0.40
± 0.50
± 0.32%
 
± 0.06
± 0.08
± 0.10
± 0.13
± 0.16
± 0.20
± 0.25
± 0.40
± 0.50
± 0.63
± 0.80
± 0.50%
Note: Special consideration on tolerances will have to be given to both extremely soft and high tensile stocks.
 
 
Why use Silicone Rubber?
Typical Properties for Silicone
RMA Tolerances for Molded Products
RMA Tolerances for Extruded Products
RMA Tolerances for Cutting to Length Extrusions
General Compatibility Chart for Various Rubber Materials