Strength The system is suitable for use in working applications up to 12 bar / 20 degrees centigrade (6 bar / 90 degrees centrigrade). Pipes are suitable for bending to a radius of 12 x diameter when unsupported or 8 x diameter when supported. Connections & fittings are tested too BS 7291: Class S for thermal cycling test, long term pressure tests, rapid pressure test & pull-out strength. System Malfunction Temperature Polyplumb pipes & fittings are tested to BS 7291@ Parts 1 & 2, which incorporates a pressurised thermal cycling test & a test regime at temperatures of 114 degrees centigrade & 3.5 bar pressure for 1, 000 cycles at a duration of 30 minutes per cycle. Gases The polyplumb system is not suitable for the transportation of gases. Standard Polyplumb pipe is Oxygen permeable & is suitable for all domestic water & heating installations. Polypipe recommends that corrosion inhitors are introduced to, & maintained in, all heating systems, whether they use standard