The combustion test of plastic pipe and its research direction
The combustion test of plastic pipe and its research direction
According to the north Rhine Westphalia state mining bureau about the method stipulated in the plastic inspection procedures, by mid - 1975, special ramo, test mine has been to 13 root plastic tubing and 1 with foam insulation pipe flame resistance have been tested, and the appraisal, the results are shown in table 2.
From table 2: from electrostatic interactions, with a soft polyvinyl chloride (PVC) film layer two pvc-u pipe, not spreading combustion have been identified to pay for and the five glass fiber reinforced epoxy resin have two good appraisal in the plastic pipe material, the other three root don't meet requirement.
The combustion test of plastic pipe and its research direction
In the six polyolefin tubes, one has a single layer of aluminum film layer and the other is a double layer aluminum film layer. All of the six pipes have failed to resist the combustion performance.
A steel tube with two 30 mm semicircle three polyisocyanate insulation foam plastic shell, using fixed wire, plastic foam shell with a 0.8 mm thick sheet metal coating, the test result is good. The test of the directional resistance of the other two steel tube insulated casing with metal shell is used. Within the combustion experiment of small tunnel, when the wind speed 1.2 meters/seconds, each time will be a tube placed in a temporary timbering 23 kg range of combustion, at this point, the burning of polystyrene foam insulation of molten drops down, and with flame retardant polyurethane foam plastic 40 mm thick insulation tube is not melting, visible flame resistant performance of the latter is better.
