Rubber Stoppers

RubberMill supplies lab stoppers to North American distributors and large-volume customers in the Laboratory, Medical, Scholastic, OEM, Paint – Finishing, Industrial, and Recreational Products markets.

Our stock standard grade stoppers are manufactured from a premium grade SBR black rubber compound with a 1.342 specific gravity (they do not float in water). They have a temperature usage range of -40C to 70C. The 40 (+/-5) Durometer material is soft, pliable, and long-lasting. Solid, one-hole, and two-hole in sizes from #000 to #15 are available. Contact us for pricing on large volumes of custom compounds or colors.

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Lab Stopper Material Specifications & Size Dimensional Reference

Lab Stopper Material Specifications

Compression Set (22h at 70 C) 38%
Heat Resistance (70h at 70 C)
Hardness Change -21%
Tensile Change -39%
Elongation Change +6 points

Specific Gravity 1.342
Compound SBR
Hardness/Durometer, Shore A 40 +/- 5
Temperature Range -40 C to 70 C
Tensile Strength 870 psi
Elongation 530%
Properties are typical values. Final determination for suitability for use must be made by the customer. (05/16)

Lab Stopper Size Dimensional Reference

Lab Stopper Dimensional Reference (mm) Lab Stopper Dimensional Reference (in)
Part# Size Top(A) Bottom (B) Length (C) Top(A) Bottom (B) Length (C) Pcs./Lb.
CLS-000 000 12 9 18 0.472 0.354 0.709 180
CLS-00 00 15 10 25 0.591 0.394 0.984 105
CLS-0 0 17 13 25 0.669 0.512 0.984 77
CLS-01 1 19 14 25 0.748 0.551 0.984 57
CLS-02 2 20 16 25 0.787 0.630 0.984 52
CLS-03 3 24 18 25 0.945 0.709 0.984 39
CLS-04 4 26 20 25 1.024 0.787 0.984 33
CLS-05 5 27 23 25 1.063 0.906 0.984 28
CLS-05.5 5 1/2 28 24 25 1.102 0.945 0.984 26
CLS-06 6 32 26 25 1.260 1.024 0.984 20
CLS-06.5 6 1/2 34 27 25 1.339 1.063 0.984 18
CLS-07 7 37 30 25 1.457 1.181 0.984 15
CLS-07.5 7 1/2 39 31 25 1.535 1.220 0.984 14
CLS-08 8 41 33 25 1.614 1.299 0.984 12
CLS-08.5 8 1/2 43 36 25 1.693 1.417 0.984 11
CLS-09 9 45 37 25 1.772 1.457 0.984 10
CLS-09.5 9 1/2 46 38 25 1.811 1.496 0.984 9
CLS-10 10 50 42 25 1.969 1.654 0.984 6
CLS-10.5 10 1/2 53 45 25 2.087 1.772 0.984 7
CLS-11 11 56 48 25 2.205 1.890 0.984 6
CLS-11.5 11 1/2 63 50 25 2.480 1.969 0.984 5
CLS-12 12 64 54 25 2.520 2.126 0.984 5
CLS-13 13 68 58 25 2.677 2.283 0.984 4
CLS-13.5 13 1/2 75 62 35 2.953 2.441 1.378 3
CLS-14 14 90 75 39 3.543 2.953 1.535 1.6
CLS-15 15 103 83 39 4.055 3.268 1.535 1.3

In addition to our standard stocked items, we manufacture custom stoppers in all durometers and compounds. Visit our Technical Data Section to learn more about different rubber compounds, durometer, and chemical resistance properties.

Tapered rubber stoppers are the most common configuration, but we can provide any shape plug, bung, or stopper you need for labware, bottles, boiler tubes, flasks, jars, test tubes or similar containers. Contact us to discuss your unique stopper needs.