Professional Silicone Rubber Parts Manufacturers

Rubber stopper definition

An apt rubber stopper definition would be a small, usually conoid or tapered plug used to conceal the openings of test tubes, vessels, flasks, and many other containers, especially glassware. Stopper plugs made of cork are available, too. But, rubber stoppers are generally preferred to stoppers made of different materials. They provide a better temperature and chemical resistance.
As the rubber stopper definition suggests, a rubber stopper’s chief function is to disguise and conceal holes. It is used in laboratories worldwide to block a gas or fluid from escaping its vessel while performing a scientific experiment. Another primary function of rubber stoppers is to limit chemical samples’ corruption by oxidation, as it protects them from being exposed to air. Finally, rubber stoppers also enable efficient shaking or mixing of chemical solutions without causing spillage.
Rubber stoppers may also be used to seal off the mouth of a test tube.
The most common shape of rubber stoppers is cylindrical, having a tapered or conoid bottom surface. Many commercially available rubber stoppers have one or two holes in them that allow the insertion of test equipment such as a thermometer, thermostat, pipette, etc. The size of a rubber stopper, as described by the rubber stopper definition, is small. Conventionally, its height ranges from 0.5 inches in diameter to 5 inches in width at its top. The conoid bottom surface ranges from 5/16 inches to a maximum of 3.5 inches. Stoppers smaller in size are best for test tubes and other glassware, whereas stoppers that are big are better for flasks, vessels, and beakers. The central properties of stoppers, highlighted by the rubber stopper definition, are their impermeability, chemical and temperature resistance, and elasticity. These attributes make rubber stoppers safe to use and remarkably efficient at concealing the openings.

Our Products

Rubber Plugs(T-shaped blind hole)
Rubber Cork
Type 1
Type 2
Type 3
Type 4

All dimensions are in mm​

Part No.A (mm)B (mm)C (mm)D (mm)ColourMaterials
RSD2.7-5.5-52.75.552Black, WhiteSilicone
RSD3-7-73772.2Black, WhiteSilicone
RSD3.3-6.5-63.36.561.5Black, WhiteSilicone
RSD3.5-6.5-63.56.562Black, WhiteSilicone
RSD3.8-7-63.8761.5Black, WhiteSilicone
RSD4-9.5-749.572.5Black, WhiteSilicone
RSD4.3-8-64.3861.5Black, WhiteSilicone
RSD4.5-7.5-64.57.562Black, WhiteSilicone
RSD4.8-9-74.8971.5Black, WhiteSilicone
RSD5-12-851282.8Black, WhiteSilicone
RSD5.3-9.5-75.39.571.5Black, WhiteSilicone
RSD5.5-8.5-75.58.572Black, WhiteSilicone
RSD5.8-10-85.81082Black, WhiteSilicone
RSD6-13-861383.5Black, WhiteSilicone
RSD6.3-10.5-86.310.582Black, WhiteSilicone
RSD6.5-9.5-76.59.572Black, WhiteSilicone
RSD7-14-971493.5Black, WhiteSilicone
RSD7.5-10.5-87.510.582Black, WhiteSilicone
RSD8-15-981593.5Black, WhiteSilicone
RSD8.5-11.5-88.511.582Black, WhiteSilicone
RSD9-16-991693.5Black, WhiteSilicone
RSD9.5-12.5-89.512.582Black, WhiteSilicone
RSD10-18-101018104Black, WhiteSilicone
RSD10.5-13.5-910.513.592Black, WhiteSilicone
RSD11-19-101119104Black, WhiteSilicone
RSD11.5-14.5-911.514.592Black, WhiteSilicone
RSD12-20-101220104Black, WhiteSilicone
RSD12.5-15.5-1012.515.5102Black, WhiteSilicone
RSD13-21-101321104Black, WhiteSilicone
RSD13.5-16.5-1013.516.5102Black, WhiteSilicone
PartNo.A(mm)B(mm)C(mm)D(mm)E(mm)
RST2.5-5.5-5.32.55.55.320
RST2.7-5.5-52.75.5520
RST3-4.3-4.534.34.50.80
RST3-7-73772.20
RST3.3-6.5-63.36.561.50
RST3.5-6.5-63.56.5620
RST3.8-7-10.53.8710.51.50
RST3.8-7-73.8771.50
RST3.8-7-63.8761.50
RST4-7.5-647.5620
RST4-9.5-749.572.50
RST4.3-8-64.3861.50
RST4.5-7.5-64.57.5620
RST4.8-6.8-3.64.86.83.60.90
RST4.8-9-74.8971.50
RST5-8-7-25871.52
RST5-8-7-35871.53
RST5-10-851082.80
RST5-12-851282.80
RST5.3-9.5-75.39.571.50
RST5.5-8.5-75.58.5720
RST5.7-11.7-125.711.7126.50
RST5.8-10-85.810820
RST6-8-56852.20
RST6-13-861383.50
RST6.2-8.2-9.66.28.29.63.93.8
RST6.3-10.5-86.310.5820
RST6.5-8-46.58420
RST6.5-9.5-76.59.5720
RST6.8-8-46.88410
RST7-10-871081.54
RST7-14-971493.50
RST7.3-11.5-87.311.5824
RST7.5-10.5-87.510.5820
RST7.8-12-87.812824.5
RST8-11-881181.54.5
RST8-11-781172.50
RST8-15-981593.50
RST8.3-12.5-88.312.5825
RST8.5-12-88.512825
RST8.5-10-68.510620
RST8.5-11.5-88.511.5820
RST8.6-11-3.38.6113.32.20
RST8.8-11-158.811153.20
RST9-13-8913825.5
RST9-13-9913925
RST9-16-991693.50
RST9.5-12.5-89.512.5820
RST10-14-91014926
RST10-12-1010121020
RST10-15-1110151110
RST10-18-1010181040
RST10.5-12-1010.5121010
RST10.5-13.2-2110.513.22145.7
RST10.5-13.5-910.513.5920
RST11-15-1011151027
RST11-19-1011191040
RST11.2-16.7-11.511.216.711.52.54.7
RST11.5-14.5-911.514.5920
RST12-16-1012161027.5
RST12-20-1012201040
RST12.5-15.5-1012.515.51020
RST13-17-1013171028
RST13-19.5-71319.573.30
RST13-21-1013211040
RST13.5-16.5-1013.516.51020
RST14-18-1014181029
RST14.5-19.7-1114.519.71130
RST15-23-1015231046
RST15.3-20-1015.3201036
RST15.5-20-1015.5201036
RST16-24-1016241047
RST16.5-21.5-1716.521.517119
RST17-25-1017251047
RST17.2-20-717.22071.25.8
RST18-26-1018261048
RST19-27-1019271049
RST19.5-25-1019.52510310
RST19.5-26-1019.52610516
RST19.5-25-1519.52515310
RST20-27-10202710315
RST20-28-10202810410
RST21-29-10212910411
RST22-29-10222910412
RST23-33-10233310513
RST24-31-10243110414
RST24.5-30-1024.53010315
RST24.5-30-1524.53015315
RST25-35-10253510515
RST25.4-32-1025.43210316
RST26-33-102633103.516
RST27-34-102734103.517
RST28-35-102835103.518
RST29-36-102936103.519
RST30-40-123040121.520
RST30-40-7304072.220
RST30.3-36-1030.336103.520
RST31.3-37-1031.337103.521
RST33.3-38-1233.338123.522
RST33.3-38-1533.338153.522
RST36.3-42-1236.342123.525
RST37.6-43.5-1237.643.5123.526
RST39.3-45-1239.345123.528
RST41.3-48-1241.348123.530
RST43.5-49-1243.549123.533
RST46.3-52-1246.352123.535
RST48.5-54-1248.554123.538
RST51.3-57-1251.357123.540
RST52.5-83-1652.58316744.5
RST53.6-60-1453.660143.542
RST56.3-62-1256.362123.544
RST58.6-65-1458.665143.547
RST61.3-67-1261.367123.549
RST63.6-70-1463.670143.552
RST66.3-72-1266.372123.554
RST68.6-75-1468.675143.557
RST71.3-77-1271.377123.559
RST73.6-80-1473.680143.562
RST76.3-82-1276.382123.564
RST78.6-85-1478.685143.567
RST80-90-12.5809012.55.570
RST81.3-87-1281.387123.568
RST82.3-87-1282.38712568
RST83.6-90-1483.690143.572
RST86.3-92-1286.392123.574
RST88.6-95-1488.695143.577
RST91.3-97-1491.397143.578
RST93.6-100-1493.6100143.581
RST96.3-102-1496.3102143.583
RST98.6-105-1498.6105143.586
RST101.5-114-15101.511415585
RST103.6-112-15103.611215490
RST106.5-115-15106.511515589
RST108.6-117-15108.611715495
RST111.5-120-15111.512015594
RST113.6-122-15113.6122155100
RST116.5-125-15116.512515599
RST121.5-130-15121.5130155104
RST126.5-135-15126.5135155109
RST131.5-140-15131.5140155114
RST136.5-145-15136.5145155119
RST140.5-160-15140.516015100
RST141.5-150-18141.5150185124
RST146.5-155-18146.5155185129
RST151.5-160-18151.5160185134
RST156.5-165-18156.5165185139
RST161.5-170-18161.5170185144
RST166.5-175-18166.5175185149
RST171.5-180-18171.5180185154
RST176.5-185-18176.5185185159
RST181.5-190-18181.5190185164
RST186.5-195-18186.5195185169
RST191.5-200-18191.5200185174
RST196.5-205-18196.5205185179
RST201.5-210-18201.5210185184
Part No.A (mm)B (mm)C (mm)D (mm)E (mm)
RSB2.5-6-32.5631.50
RSB3-7-337320
RSB3.5-7.5-33.57.5320
RSB3.6-7.5-63.67.5620
RSB4-8-348320
RSB4.5-8.5-34.58.5322
RSB5-9-359322.5
RSB5.5-9.5-35.59.5323
RSB6-10-4610423.5
RSB6.5-10.5-46.510.5424
RSB6.5-12-86.512820
RSB6.7-8.7-5.36.78.75.31.34.1
RSB7-11-4711424.5
RSB7.5-11.5-47.511.5425
RSB8-12-4812425.5
RSB8-12-581253.55.5
RSB8.5-12.5-48.512.5426
RSB8.7-10.7-5.88.710.75.826.1
RSB9-13-5913526.2
RSB9.5-13.5-59.513.5526.5
RSB10-14-51014527
RSB10.5-14.5-510.514.5527.5
RSB11-15-51115528
RSB11.5-15.5-511.515.5528.5
RSB12-16-51216529
RSB12-15.9-6.51215.96.51.90
RSB12.5-16.5-512.516.5529.5
RSB13-17-513175210
RSB13.5-17.5-613.517.562.510.3
RSB13.5-18-713.5187310
RSB14-18-6141862.510.5
RSB15-19-6151962.511
RSB16-20-6162062.512
RSB17-21-6172162.513
RSB17.5-25-7.317.5257.3314
RSB18-23-718237314
RSB19-24-719247315
RSB20-25-720257316
RSB21-26-721267316.5
RSB22-27-722277317.5
RSB22-30-5.522305.5317
RSB23-28-723287318.5
RSB24-29-724297319
RSB25-31-8253183.520
RSB26-32-8263283.521
RSB27-33-8273383.522
RSB27-35-4.527354.5322
RSB28-34-8283483.523
RSB29-35-8293583.524
RSB30-36-8303683.525
Part No.Diameter ADiameter BHeightColourMaterials 
RSA1.6-0.4-15.91.60.415.9TransparentSilicone
RSA2-0.5-19.120.519.1TransparentSilicone
RSA3.2-0.8-15.93.20.815.9TransparentSilicone
RSA3.2-1.6-15.93.21.615.9TransparentSilicone
RSA4.8-1.6-15.94.81.615.9TransparentSilicone
RSA4.8-1.6-19.14.81.619.1TransparentSilicone
RSA5.5-1.2-38.15.51.238.1TransparentSilicone
RSA6.4-3.2-19.16.43.219.1TransparentSilicone
RSA6.4-3.2-25.46.43.225.4TransparentSilicone
RSA8.7-4.8-15.98.74.815.9TransparentSilicone
RSA8.7-4.8-25.48.74.825.4TransparentSilicone
RSA9.2-6.2-12.89.26.212.8TransparentSilicone
RSA9.5-6.5-18.59.56.518.5TransparentSilicone
RSA11-8.5-17.5118.517.5TransparentSilicone
RSA11.5-6.5-2511.56.525TransparentSilicone
RSA12-9-1812918TransparentSilicone
RSA12.6-9-1712.6917WhiteEPDM
RSA14.3-7.9-28.614.37.928.6TransparentSilicone
RSA14.3-9-25.414.3925.4TransparentSilicone
RSA15-11-20151120WhiteEPDM
RSA15.1-10.3-25.415.110.325.4TransparentSilicone
RSA15.9-11.1-22.215.911.122.2TransparentSilicone
RSA16.7-12.7-25.416.712.725.4TransparentSilicone
RSA17-13.6-241713.624WhiteEPDM
RSA17.5-11.1-25.417.511.125.4TransparentSilicone
RSA19-15-27191527WhiteEPDM
RSA19.1-14.3-25.419.114.325.4TransparentSilicone
RSA19.1-14.3-14.319.114.314.3TransparentSilicone
RSA19.8-15.9-25.419.815.925.4TransparentSilicone
RSA20-15.5-162015.516TransparentSilicone
RSA21-16-26211626WhiteEPDM
RSA23-18-26231826WhiteEPDM
RSA23.5-19-19.523.51919.5TransparentSilicone
RSA23.8-18.3-25.423.818.325.4TransparentSilicone
RSA25.4-19.8-25.425.419.825.4TransparentSilicone
RSA26-20-28262028WhiteEPDM
RSA27-23-25.4272325.4TransparentSilicone
RSA27.9-23.8-25.427.923.825.4TransparentSilicone
RSA29-23-28292328WhiteEPDM
RSA31.8-26.2-25.431.826.225.4TransparentSilicone
RSA33-26-28332628WhiteEPDM
RSA33.4-27-25.433.42725.4TransparentSilicone
RSA36.5-30.2-25.436.530.225.4TransparentSilicone
RSA37-28-30372830WhiteEPDM
RSA38.9-31.8-25.438.931.825.4TransparentSilicone
RSA39-31-25393125TransparentSilicone
RSA41.3-33.3-25.441.333.325.4TransparentSilicone
RSA42-32-31423231WhiteEPDM
RSA42.9-35.7-25.442.935.725.4TransparentSilicone
RSA43-36-25433625TransparentSilicone
RSA44.5-37.3-25.444.537.325.4TransparentSilicone
RSA46-38-25463825TransparentSilicone
RSA46-38.1-25.44638.125.4TransparentSilicone
RSA49-37-31493731WhiteEPDM
RSA50-41.3-25.45041.325.4TransparentSilicone
RSA52-43-32524332WhiteEPDM
RSA52.4-44.5-25.452.444.525.4TransparentSilicone
RSA53-45-25534525TransparentSilicone
RSA56-46-34564634WhiteEPDM
RSA56-47.6-25.45647.625.4TransparentSilicone
RSA62-51-35625135WhiteEPDM
RSA62.7-50-25.462.75025.4TransparentSilicone
RSA63-50-25635025TransparentSilicone
RSA63.5-54-25.463.55425.4TransparentSilicone
RSA67-55-39675539WhiteEPDM
RSA68.3-57.9-25.468.357.925.4TransparentSilicone
RSA75-61.9-34.97561.934.9TransparentSilicone
RSA88.9-76.2-38.188.976.238.1TransparentSilicone
RSA101.6-82.6-38.1101.682.638.1TransparentSilicone
RSA127-88.9-50.812788.950.8TransparentSilicone
  • Material: EPDM/NR/SBR/Silicone/FKM/NBR/CR
  • Hardness: 50-60 Shore A
  • Temperature Rang: -20℃ to 150℃, we can customize products with a temperature resistance of more than 300℃.
  • Colors: Black,White Or according to the Pantone NO#.
  • Custom service available, we can offer special products according to your requirements.

Do you need a quote? Or need to place an order?
We also provide customized services, and can make various non-standard silicone rubber parts according to your drawings or samples.
Welcome to contact us for more information!

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