High-quality PP-R pipeline identification method
1 Product appearance
The national standard puts forward clear requirements for the appearance of PP-R pipes and fittings. The main product color should be uniform and non-colored; the inner and outer surfaces of the product should be smooth and flat, and no air bubbles, obvious depressions, grooves, and impurities are allowed. Other defects.
2 Product ID
Pipes produced by regular manufacturers have the company's trademark and name, product name (PP-R), product pipe series (S) and nominal outside diameter and wall thickness, production date or production lot number, and national standard number (GB/T). 18742.2-2002), there are some regular manufacturers even put the product production time, contact telephone and other content also put up, this product can in fact be used with confidence, pipe fittings products will also have the above part of the logo.
3 welding identification PP - R pipe welding time <br> normal welding temperature in the range of 260-290 °C, in this temperature section welding quality welding will be better guaranteed, if the normal welding parameters, welding product can be very Easy to enter the fusion stencil, and the welding accumulation tumor is close to the liquid state, indicating that the product is not produced from PP-R raw material of the authentic powder, and the welding and accumulation tumor can quickly explain the product if it can quickly cool and harden (generally within 10 seconds). It is not an authentic PP-R raw material. This is because one of the characteristics of PP-R is that the insulation effect is better, and the cooling rate will naturally be slower.
4 Test detection
When we use the above methods can not distinguish the pros and cons of the product, we can only use the test equipment for testing to effectively distinguish the pros and cons of the product. The national standard specifies several very important test requirements data, such as pipe aging test (ring stress at 1.9MPa, test temperature of 110 °C, 8760 hours without failure test), pipe system stability test (cold heat 5000 cycles) and impact resistance test, so the user can request the manufacturer or merchant to provide the above test report for verification. In addition, it is required that the national standard also has an important requirement for the raw materials used in pipes and fittings. That is, the melt index, the national standard value, and the change in the melt index before and after processing cannot exceed 30%, and there is also a requirement in the industry that the raw material melt index cannot Greater than 0.5g/10min.
Wei Shuibao specials:
Wei Shuibao specials:
Wei Shuibao imported hot water pipe Specifications: 25*4.2
Original price: 24.9 yuan / m Super special price: 14.5 yuan / m Wei Shuibao original import Specification: 25*3/4 direct male silk market Price:Â¥54.60
Purchase price:Â¥38.22
Super specials; 2.8 yuan / month
Http://hz.tg.com.cn/qbs/shop_cuxiao_6989.html
Decoration company
Cylindrical Lens is used to correct astigmatism in the eye, and, in rangefinders, to produce astigmatism, stretching a point of light into a line.They are available in either Plano-Concave Cylinder Lens or plano-convex cylinderical lens configurations. Plano-Concave Cylindrical lens has a negative focal length and are used for image reduction or to spread light. Plano-Convex Cylinder lens has a positive focal length, which makes the cylindrical lens ideal for collecting and focusing light for many imaging applications. Every sizes,materials cylindrical lens are available according to your detailed parameters.
Some styles of cylindrical lens have antireflective coatings to increase the transmission of light through the cylindrical lens.
Fused silica cylindrical lens is ideal for demanding laser machining and medical applications.
Specification of our plano-concave cylinder lens or plano-convex cylinderical lens, meniscus cylinder lens as follow:
*Material: BK7,Ge,UV-grade fuse silica(JGS1,JGS2,JGS3)or other optical materials
*Dimension Tolerance: +0.0 -- -0.1mm
*Center Thickness: +/-0.1mm
*Focal Length Tolerance: +/-1%
*Surface Quality:20/10
*Surface Figure: lambda/2 at 633nm on plano side
*Clear Aperture>90%
*Chamfer: 0.25mm at 45 degree typical
*Coating Optional
Plano-Convex Cylindrical Lens,Plano Convex Cylindric Lens,Plano-Convex Cylinder Lens,Achromatic Cylindrical Lens
China Star Optics Technology Co.,Ltd. , https://www.opticsrealpoo.com