UPVC drainage pipe fittings should mainly consider the following aspects:
1 appearance. Good fitting outer wall is smooth, no thorns, no color, clear edges and neat, thick wall, feel thick.
2 heat resistance (standard). Pipe fittings in 150 DEG C oven according to the corresponding wall thickness and drying time, see Table 2, does not appear serious skin, burst, little color changes, especially near the injection point and seam line should not appear to penetrate the cracks.
3 low temperature brittleness (Standard Test). The sample in the refrigerator at 0 centigrade degree placed 30min out immediately after in the cement on the ground free fall, the outer diameter is not greater than 75mm tube attached to fall height of 2m, greater than 75mm tube height of 1m, and see no cracks on the surface of the tube, the intact products prove its performance meets the requirements.
4 and the pipe connecting parts (called standard socket) the length or depth of long enough. Informal enterprises in the production of pipe fittings, in order to reduce costs, deliberately cut corners, bell and spigot are generally shorter, so later in the use of easy to make joint leakage. If considered from the security point of view, socket depth as long as possible, the user can compare or actual measurement. But from the economic point of view, the minimum value of the depth of the mouth is given in the standard.
5 pay attention to the matching between the pipe and the pipe. First application of tube try inserting tube several times, should feel not difficult, but after insertion nor too loose as well; secondly, we should buy matching PVC plastic adhesive to firm adhesion.
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