White Round Silicone Rubber End Caps for Tubes & Pipes — 3mm to 60.5mm

Measure the outer diameter (OD) of your tube or pipe. The "A" dimension in each variant is the inner diameter of the cap and should match your tube's OD. For example, if your tube OD is 12.7mm (≈1/2"), select A=12.7mm. Silicone stretches slightly, so a cap 0.2–0.5mm smaller than your tube OD will form a tighter seal. When in doubt, size up — you can always confirm fit before committing to a larger quantity.

These silicone rubber end caps are generally rated for continuous use from -40°C (-40°F) to +250°C (+482°F). This covers most powder coating oven cycles (typically 180–200°C), automotive engine bay temperatures, HVAC applications, and outdoor environments. Short-term exposure to slightly higher temperatures is typically tolerated, but prolonged use above 250°C may cause gradual hardening.

Yes. Silicone rubber is inherently resistant to UV radiation, rain, humidity, and mild chemicals. These caps are generally suitable for outdoor use on furniture, fencing, and equipment. Prolonged exposure to strong solvents, concentrated acids, or petroleum-based oils may degrade performance over time — contact us to confirm suitability for specific chemical environments.

These caps fit round tubes and pipes by outer diameter and are generally compatible with metric tubing, EMT conduit, copper pipe (Type K/L/M), aluminum extrusions, and steel tubing. They are not designed for threaded fittings or non-round profiles. Always verify the OD of your specific tube before ordering — nominal pipe sizes (NPS) do not always match actual OD.

Yes — this is one of the most common uses. Silicone end caps withstand typical powder coating oven temperatures (180–200°C / 356–392°F) and peel off cleanly after curing without leaving adhesive residue. The white color also makes it easy to spot and remove all caps after the process. For anodizing or chemical baths, confirm chemical compatibility first.

The 50° Shore A hardness provides a firm yet flexible interference fit. For static applications — dust caps, end covers, furniture leg protectors, storage plugs — the grip is generally sufficient. For pressurized lines (pneumatic, hydraulic), these caps are not rated as pressure seals; a purpose-rated pressure plug with a locking mechanism is recommended for those applications.

Yes. Silicone rubber is highly elastic and durable, so these caps can typically be removed and reinstalled multiple times without losing their shape or sealing ability. Avoid stretching them beyond their rated diameter range or exposing them to sharp edges that could cause tearing. With normal use, they maintain their fit through many installation cycles.