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Technical Information

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RMA Table 36 – Sponge Cross Section Organic/Silicone #1, BEC 1

Tolerances on cross-sectional dimensions of irregular and cored shapes of extruded, closed-cellular rubber. Class 1 Tolerances in the table below are recommended only for high volume, tight products, or automotive applications.

RMA Class 1* 2 3
RMA Dwg. Designation BEC1 BEC2 BEC3
Millimeters
0 – 6.3 +/- 0.4 +/- 0.5 +/- 0.63
6.3 – 12.5 0.63 1 1.25
12.5 – 25 1.25 2 2.5
25 – 40 2 3.2 4
40 & Over multiply by: 0.06 0.08 1
Inches
0 – 0.25 +/- 0.016 +/- 0.020 +/- 0.025
0.25 – 0.5 0.025 0.04 0.05
0.5 – 1 0.05 0.08 0.1
1 – 1.6 0.08 0.125 0.16
1.6 & Over multiply by: 0.06 0.08 0.1

*Class 1 tolerances should not be applied to softer grades of material—below 63 kPa (9psi) compression deflection.

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RMA Table 13—Dense Cross-Section Organic/Silicone

Standards for cross-sectional tolerance table

RMA Class 1 2 3
High Precision Precision Commercial
Drawing Designation E1 E2 E3
Dimensions (mm)
0 1.5 +/- 0.15 +/- 0.25 +/- 0.40
1.5 2.5 0.2 0.35 0.5
2.5 4 0.25 0.4 0.7
4 6.3 0.35 0.5 0.8
6.3 10 0.4 0.7 1
10 16 0.5 0.8 1.3
16 25 0.7 1 1.6
25 40 0.8 1.3 2
40 63 1 1.6 2.5
63 100 1.3 2 3.2
RMA Class 1 2 3
High Precision Precision Commercial
Drawing Designation E1 E2 E3
Dimensions (in)
0 0.06 +/- 0.006 +/- 0.010 +/- 0.015
0.06 0.1 0.008 0.014 0.02
0.1 0.16 0.01 0.016 0.027
0.016 0.25 0.014 0.02 0.031
0.25 0.39 0.016 0.027 0.039
0.39 0.63 0.02 0.031 0.051
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 (3.94in.) should be agreed upon by supplier and user.

Material Comparison Chart—Standard Offered Compounds

Standards for cross-sectional tolerance table

RESISTANT TO:
Material Oil Elect Flame Impact Abras Tearing Weather Oxid Ozone
EPDM P E P G G G VG E E
NBR (Nitrile) E P P G G F P G F
Neoprene G VG G G E G VG E E
Polyisoprene /Natural P E P E E E F F P
SBR P G P E VG F F G F

E=Excellent, VG=Very Good, G=Good, F=Fair, P=Poor Additional Materials/Custom Compounds available. Please contact a sales representative for additional information.

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