Frequently Asked Questions

HFT Pipestoppers Nylon Plugs Pipe Stoppers Testing Products

1. What is the maximum working temperature for the Nylon Plugs?

Nylon Plugs can be used intermittently up to 120˚C (248˚F) and the natural rubber rings up to 100˚C (212˚F). In continuous use, the nylon should be restricted to 100˚C (212˚F) and the rubber ring to 80˚C (176˚F).

For higher temperatures, HFT Pipestoppers® Division manufacture plugs made from steel or aluminium.

We manufacture and stock rubber sealing rings made from silicone and viton which can be used continuously up to temperatures of 200˚C (392˚F) and intermittently up to 300˚C (572˚F).

2. I have a hole to seal, where your plug won’t quite seal well enough, but the next size up is too big. Do you have any in between sizes?

The user can extend the range of each plug by a few millimetres by using an exterior rubber seal on top of the ring provided. (contact us at our HFT Pipestoppers® Division for complete details.

3. I want to use the plugs in an application where natural rubber is not suitable. Can I have the rings made from other materials?

Yes, we manufacture and stock the sealing rings in silicone, nitrile and viton.

4. What pressures can the plugs withstand?

A pressure chart for Nylon Plugs is shown on the leaflet along with working conditions.

5. Will the Nylon Plugs withstand attacks from various acids, alkalis and chemicals?

A full technical data sheet about the chemical resistance of nylon is available on request.

6. Can the plugs be used as a permanent stopper in pipes?

Subject to the pressure and the internal surface of the pipes, our plugs can be used effectively as a permanent stopper. The wings can be cropped to prevent tampering. The inside of the pipe should be clean and free from debris at the sealing point.

7. What is the thread on the outside of the small bore hollow shaft Nylon Plugs?

10 mm.

8. What is the thread on the outside of the large bore hollow shaft Nylon Plugs?

1/2” BSP.

9. Can I have the plugs made with company logo in our company house colours?

If your quantities are sufficient, we manufacture a range of colours. You may choose to have your company name and logo on the sealing cap in addition.


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