Silicone Bladders for Pipe Relining: UV Curing Tips & Guide

In pipe relining, one of the most essential tools is the silicone bladder. Whether you’re working on straight runs or complex junctions, knowing the different types of bladders and how they function can save time, prevent leaks, and ensure a successful relining project.

Types of Silicone Bladders

Our bladders come in several types to meet different pipe relining needs:

Standard Bladders – Designed for straight pipe runs, these bladders are made from UV-curable silicone, allowing slight stretching without tearing.

Junction Bladders – Made for pipe junctions, these bladders are available in multiple configurations:

• 45° Y-shape
• 90° T-shape
• Double lateral bladders (two outlets on either side, available in 45° or 90°)

All junction bladders are crafted from durable silicone and feature an internal lattice reinforcement. Similar to rebar in concrete, this lattice allows the bladder to stretch without tearing, ensuring leak-free performance.

How Silicone Bladders Work

The design and construction of bladders are key to their reliability:

• Internal Bonding: The inside is bonded with silicone for durability.
• External Bonding: A special tape reinforces the outside to prevent leaks.
• Transparency: Many bladders are see-through, making them ideal for UV curing.

These features make silicone bladders suitable for multiple installation methods:

• Pull-in-place
• Push-in-place
• UV curing

End Caps and Installation

For junction bladders, end caps are crucial:

• Flat End Cap: Inflates automatically and works for many junctions.
• Dome End Cap: Another option depending on the pipe layout.

Two sides of a junction bladder connect to the packer base, while the third side inflates on its own. A rod can be inserted between the sides to push and twist the bladder into place efficiently.

Why Silicone Bladders Are Essential

Silicone bladders are more than just flexible—they are engineered for durability and reliability. Their UV-curable silicone, reinforced lattice, and bonded construction make them ideal for:

• Ensuring a leak-free seal
• Preventing tears during inflation
• Allowing effective UV curing

Conclusion

Whether you are a professional plumber or a contractor specializing in pipe relining, understanding the types of silicone bladders and their features is critical. From standard bladders to complex junction designs, choosing the right bladder ensures smooth installation, proper curing, and long-lasting results.

Please take a look at the video we created for a more visual explanation.