How to choose the right rubber stopper? Here's how:
How to Choose the Right Rubber Plug
Rubber plugs (rubber grommets / rubber plugs) help seal openings, resist dust and water, reduce vibration, and protect contact surfaces. To choose the right type, you need to clearly define the technical requirements, working environment, and suitable material.
1) Determine the technical requirements
- Water resistance: prioritize this when used outdoors or frequently exposed to liquids.
- Heat resistance / electrical insulation / elasticity: important in harsh environments, near heat sources, or electrical equipment.
- Elasticity & durability: necessary if the plug is subject to compression, vibration, or frequent opening/closing.
Quick tip: if you are not sure, start with the “usage environment” (water – heat – chemicals – vibration), then finalize the material and size.
Rubber Plug Classification Table
List of common size codes (diameter – height) and color options. You can click the product name to open the detail page.
Rubber Plug Classification Table
Quick links: Quick selection consultation View catalog
NO.
Product Name
Material
Color
Link
Note: The /san-pham/... links are examples only — you just need to replace them with the actual website URLs. On mobile, the table automatically switches to a vertical layout so it does not need horizontal scrolling and still fits the frame.
Quick selection process (5 steps): (1) Determine the usage environment → (2) Choose the material grade (Good/Premium/Silicone/Heat-resistant) → (3) Choose the correct size (measure hole & tolerance) → (4) Choose the plug type based on the need (sealing/cable pass-through/shock absorption) → (5) Check installation & sealing before putting it into operation.
2) Classification of Rubber Plugs by Shape/Application
There are many lines of rubber plugs/gaskets on the market in different sizes. Below is a reference table to help you classify them by structure and intended use.
Classification Table by Shape / Application
Group
Features
Typical Applications
Sealing Plugs
Provide sealing, reduce dust/water ingress; often in stopper or grooved-plug form.
waterproof dustproof vibration reduction
Cover technical holes, seal threaded/drilled holes, cover openings in electrical cabinets – machine housings.
Holed Plugs / Grommets
Have a hole for wires/tubes; protect cut edges, prevent abrasion, and improve aesthetics.
wire protection edge protection
Route electrical cables, tubes, and signal wires through metal/plastic holes.
Shock-Absorbing Plugs/Pads
Optimized elasticity to absorb vibration and noise; often used as feet/pads.
vibration reduction noise reduction
Mechanical equipment, machinery, fans, motors, and vibrating assemblies.
Specialized Plugs
Custom-designed for specific requirements: oil/chemical resistance, heat resistance, or hygiene standards.
oil resistant heat resistant hygienic
Food and medical industries, chemical environments, high-temperature areas.
Tip: If you already have a drawing/hole size, compare the hole diameter, wall thickness, and compression level to ensure a proper fit and sufficient sealing.
3) Classification by Material & Quality
Based on the classification table below, you can choose the appropriate material according to the usage level.
| Type | Key Characteristics | Suggested Applications |
|---|---|---|
| Standard | Common type; meets basic needs. Made from standard rubber/pad materials, with limited water resistance and moderate durability/elasticity. | Temporary use, low cost. |
| Good | Decent-quality rubber; high elasticity; stable water resistance. | Common applications requiring frequent sealing against water. |
| Premium | Pure rubber; good durability; high sealing performance and elasticity. | Applications requiring durability, good waterproofing, and high compression resistance. |
| Silicone | Pure silicone; good purity; elastic; heat-resistant; water-resistant; suitable for hygienic environments. | Pharmaceutical applications, medical equipment, and places requiring high purity. |
| Heat-Resistant | Synthetic rubber; heat- and chemical-resistant; good electrical insulation. | High-temperature environments, exposure to oil/chemicals, and applications requiring insulation. |
4) Guide to Choosing the Right Rubber Plug (by Scenario)
By Environment
- Chemical exposure / light water contact: you may choose the Standard type if high sealing performance is not required.
- Frequent water exposure: prioritize Good grade or above to ensure sealing performance and service life.
Temperature & Heat Conditions
- Above 100°C or exposed to oil/chemicals: choose Heat-Resistant or Silicone.
By Hygiene Requirements
- Medical, food, and clean equipment industries: prioritize Silicone.
By Durability & Performance
- Need high durability and elasticity: choose Premium or Silicone.
- Only need basic covering/sealing: choose Standard to optimize cost.
5) Size, Color & Installation Notes
Size & Color
- Measure the hole size accurately: the size should fit properly to ensure tightness (avoid being too loose or too tight).
- Allow reasonable tolerance: in actual installation, rubber compression is often needed to create a seal.
- Color: choose according to identification/area standards (black, white, transparent… or on request).
Suggestion: Normally, the plug should be about 0.5–1.0 mm larger than the hole, depending on the material and installation method. Example: hole Ø20mm → choose a plug Ø20–Ø21mm
Installation
- Clean the hole surface before installation to avoid leakage caused by dirt.
- Check the tightness after installation (shake lightly, inspect gaps, or perform a water test if needed).
- For vibrating/humid environments: consider a type with grooves or better grip.
Reference Links
Related content: FAQ, custom manufacturing, and rubber classification. Click to open details.
FREQUENTLY ASKED QUESTIONS ABOUT RUBBER PLUGS Quick answers about size, material, application, and how to choose the right option. See more CUSTOM RUBBER PLUG MANUFACTURING Made to drawing/size: hardness, color, material, quantity. See more LEARN MORE ABOUT TYPES OF RUBBER Overview of rubber materials & selection suggestions based on environment and technical requirements. See more
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