By name: plastic clay, PVC clay, plastic ointment, waterproof ointment, caulking mastic, polyvinyl chloride caulks Category: Press the optimum temperature can be divided into temperature type and low temperature, which temperature refractory cement type up to 85 degrees, in the normal state is black elastic solid, surface sticky, visible sectional cut with a knife is very delicate, hand press good elasticity, fast rebound. Anyway, in the hands knead, can stick in hand, a better elongation, expansion joints can be applied to vertical surfaces, such as pipes gasketed, sewage treatment plant up the wall joints waterproof seal. Low temperature as low clay type clay, poor heat resistance, high summer temperatures become very soft, no support force, the winter temperature is low then becomes very hard. However, good adhesion, elongation general, generally used in waterproof seal joints horizon, such as road expansion joints, expansion joints and other plants. 1. Choose PVC clay melted by heating appliances we have used buckets, pots, iron plate and other heating vessel, through the use of milling pot ideal. Iron by heat and small size, clay uneven heating melting process, part hardened, partially melted, and some have been burnt. The shallow depth of the pan heated area, stirring Di melting, heat evenly, easy to reach pouring desired temperature. 2. PVC clay on the site due to the heating and melting method drainage lines long, not concentrated construction, generally dug a 'one Tuzao, security wok, you can heat, the method is to first cement block Generative about lOcm square and a thickness of 3 ~ 5 cm pieces, into the pot warmed slowly, stirring constantly, even to moderate fire, avoid fire for baking. Clay pot temperature did not exceed 1 20 ℃, keep the clay is not bubbling, take tobacco, smoke. If found tobacco, smoke, should immediately annealing, accelerated by stirring. Good melting clay, then access. Fill new material, continuous operation. Avoid long heating fried evil, to prevent clay performance changes. 3. Joints construction joints channels before pouring with clay, wood should first fill joints with cement, and then the debris with a brush inside seam earth to do, and then rinse the sprayer will sew until dry joints After further cement pouring process. ①u type channels: at the seams with a width of 20cm cement bags paper laid on joints, wet soil with the paper pressed into seam I cm. Then piled on the surface of the topsoil, making joints to form an "inverted siphon" good clay poured molten "inverted siphon. One hour after filling clear canal, the paper can be torn down ② arc ladder channels ; ibid method, using paper spread on the joints, fill the bottom of the channel so that the bottom surface dust arcuate segments form "inverted siphon" in the irrigation canal on either side of the slope indigo clay, clay irrigation well be "inverted siphon part, and then in clay filling the upper joints, so that the two can be a good combination later