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There's always some rules we need to meet for all rubber extrusions(dense rubber seal,sponge/foam rubber strips,co-extrusions with steel plate or wire cage) no matter with what kind material ,epdm,silicone,viton,Nitrile etc .


If there's no special requirement ,our EAGET GROUP RUBBER always strictly adhere to ISO 3302-1:1996 E and L CLASS .

Product Other Infos:

ISO 3302-1:1996(E)
E and L class

6.1 General


Extruded rubber products require greater tolerances in manufacture than those produced
by moulding since the rubber undergoes die swell and, during subsequent
vulcanization, shrinkage and deformation usually occur.
Deformation can be reduced by the use of supports during vulcanization, the nature of the support depending on the section
being produced, and the degree of control required. Such features determine the class of tolerance applicable to given dimensions.
In the case of certain synthetic rubbers, extrusion class E1 tolerances are not directly obtainable.

6.2 Classification


Three classes of tolerance on nominal cross-sectional dimensions of unsupported extrusions:
E1 high quality
E2 good quality
E3 non-critical

Table 2 - Tolerances on cross-sectional dimensions of unsupported extrusions

                                                                             Values in millimetres (unless indicated otherwise)

metal core inside trim sealwire carrier insertion for rubber co-extrusionpvc trim-pvc extrusion for refrigerated trailersside window rear vertical weatherstrip-left right car seal

Nominal  dimension

Class E1±

Class E2±

Class E3±

above

Up to and including

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

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

 

 Table 6 - Tolerances on cut length of extrusions

                                                                                 Values in millimetres (unless indicated otherwise)

small silicone tube-white silicone rubber seal for milk industryclear silicone sealepdm body door seal-epdm large flange top door weather stripflexible edge protector with embedded steel insert

Nominal length

Class L1±

Class L2±

 

Class L3±

 

above 

up to and including

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

63

12.5

1600

2500

5.0

10.0

16.0

2500

4000

6.3

12.5

20

4000

 

0.16%

0.32%

0.5%

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