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Special plastic 60/70 heated to 160 C (if allowed to use the special plastic 40/60 then hot 170 C) were spray-irrigation norms according to the order of watering (see table 3).Extrusion plastic layer is sealed, all the way. The plastic injection-plastic extrusion quality assurance on the proper side of the road with the 1m2 norms. Skewed allowed is 5%.
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