What is the difference between PU and Epoxy injection?
Question
What is the difference between PU and Epoxy injection?
Expert Answer
The main difference is purpose: PU (Polyurethane) is for *waterproofing*, while Epoxy is for *structural repair*. PU is flexible and expands to stop leaks, allowing for slight movement in the crack without tearing. Epoxy is rigid and has incredibly high bond strength; it is used to 'glue' concrete back together to restore its structural integrity. You would not use epoxy on a live leaking crack (it won't bond), and you wouldn't use PU to structurally restrengthen a column.
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Complete Guide
How to Seal Pipes & Services Through Concrete
Our complete technical guide covers penetration sealing systems, fire rating requirements, hydrophobic and intumescent materials, and installation details for pipes, cables and ducts through concrete walls and floors.
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