Rigid PVC pipe

EXAMPLES OF FORMULATIONS Basic formulation of rigid PVC pipe ... 

About 2 million hectares are under irrigation with low-diameter pipe made of LDPE/LLDPE in Europe. Higher diameter (>32 mm) tubes are usually made in HDPE or PVC. Western Europe used 100,000 tonnes of rigid PVC pipe for drainage and 65,000 tonnes/year of flexible PVC hose piping [45]. Apart from these materials, corrugated PP pipes, fittings, and accessories are also used worldwide. 

Waxes are often used as multifunctional lubricants. These are generally paraffin hydrocarbon wax (melting point 65-75°C) and polyethylene wax (melting point 100-130°C). Being nonpolar, they are very incompatible with PVC, so they are used as external lubricants. Paraffin lubricants are typically used in rigid PVC pipe and profile extrusion applications at additive levels of 0.5-1.5 phr. Partially oxidized polyethylene wax works well as an external lubricant for PVC by delaying fusion... 

Most thermoplastics are extruded as pipe, and moulded as valves and fittings. Poly vinylidene chloride was extruded and used to a limited extent prior to 1940. The techniques developed for this pipe were adapted to rigid PVC pipe in Germany during World War II. PVC and other rigid pipes can be threaded and joined by threaded fittings [33]. 

Suppose that the problem involves a length of 2-in.-diameter. Schedule 80 rigid PVC pipe holding water under a pressure of 50 psi at room temperature. The maximum allowable sag or deflection between supports is 0.25 in., which is a realistic value actually used to avoid drainage problems. It is also required that the pipe sag by not more than this amount after 10,000 hours of service. There are no wind loads and the material has an initial elastic modulus of 450,000 psi. It can now be shown that the 2-in.-diameter PVC pipe filled with water has a weight of 0.194 Ib./ft. 

Lubricant Hoechst VP H4 American Hoechst Corp., Chemical Division E Processing PVC, rigid PVC pipe Types I, II and DWV... 

This method was developed to determine the quality of rigid PVC pipe and fittings as indicated by their reaction to immersion in anhydrous acetone. An unfused PVC compound attacked by anhydrous acetone causes the material to swell, flake, or completely disintegrate. A properly fused PVC compound is impervious to anhydrous acetone and only a minor swelling, if any, is observed. 

PVC pipe Joint part of rigid PVC pipe PVC Paint brush... 

Uses Foaming agent maslerbalch for foaming operation of rigid PVC pipes and profiles can be added directly into extruder barrel Properties Powd. sp.gr. 1.4 10% blowing agent content Use Level 2.04.0 phr... 

---