TERRAM Underground warning tape (UWT) is an economical way of warning excavators of buried services, pipes and cables below ground. Underground warning tapes is a coloured polyethylene which can be supplied to your specification with any text, in any language, any colour and size. Standard underground warning tape texts are available ex-stock. Material - Linear low density polyethylene Lead free pigments with virgin grade film Soil tolerance from pH 2.5 to pH 11.0 inclusive