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Name: PP Slotted Flat Head Screws
Size:M2,M2.5,M3,M4,M5,M6,M8,M10
Material: PA66, PA+50%GF, PA+50%GF, PEEK, PVDF, PPS, PTFE, PP, PVC, PC
Standard:DIN 965,GB/T819,ANSI/ASME B18.6.3,JIS B1111-96,ISO 7046
PP material is polypropylene, and polypropylene is a non-toxic, odorless, tasteless, milky white, highly crystalline polymer with a density of only 0. 90-0. 91g/cm3 is one of the lightest varieties of all plastics. It is particularly stable to water, water absorption in water is only 0.01%, molecular weight of about 80,000-15,000. Good molding properties, but due to considerable shrinkage (1% to 2.5%). Thick-walled products are easy to concave. For some parts with high dimensional accuracy, it isn't easy to meet the requirements of the product surface gloss.
PP has high stiffness and strength. Compared to other plastics, PP has higher strength and stiffness and can withstand higher pressures and loads. PP is ideal for many applications, such as automotive parts, electrical components, etc.
It has very good heat resistance, low density, good mechanical properties, good chemical properties, and most chemicals do not react, etc.; in addition, it can be used in machinery and automobile manufacturing parts, electronic and electrical industrial devices, construction, and so on.
Product Specification
PP plastic features
1, heat resistance is excellent; pp products can be used for a long time in a high-temperature environment below 100 degrees, and the temperature of 150 degrees or so will not be deformed.
2. The density is small, 0.81---0.91g/㎝3, the most negligible density among the commonly used plastics.
3. pp material has good mechanical properties, high heat resistance, good chemical properties, almost no water absorption, no reaction with most chemicals, pure texture, non-toxicity, and good electrical insulation.
4. No drying treatment is needed if it is stored properly.
5. The back pressure of the melt can be 5 bar, and the back pressure of the color powder material can be adjusted more appropriately.
6. The melting point is 160-175 ° C, and the decomposition temperature is 350 ° C. However, in the injection process, the temperature setting can not exceed 275 ° C, and the mold temperature is 50-90 ° C. For the size of the higher requirements of high mold temperature, the core temperature is lower than the cavity temperature of 5 ° C or more.
7. Injection pressure: using higher injection pressure and holding pressure, holding pressure is about 80% of the injection pressure. About 95% of strokes occur with a longer holding time when turning pressure.
8. Injection speed: To reduce internal stress and deformation, high-speed injection is recommended, but for engraved patterns on the surface of the dark and light streaks spread by the gate, low-speed injection and a higher mold temperature are necessary.
9. Mold. General runner four a 7mm, needle-shaped gate length one a 1.5mm, the diameter can be as small as 0.7mm. Edge-shaped gate length, the shorter the better, about 0.7mm, the depth of half the wall thickness, the width of the wall thickness of twice, and with the length of the melt flow in the mold cavity gradually increased, the mold must have a good exhaust, exhaust holes deep 0.025mm a 0.038mm, 1.5mm thick, to avoid Shrink marks should be used with a large and round injection port and round runners, the thickness of the reinforcement should be small.
10. pp melt viscosity with the increase in shear speed and a significant decline in the temperature is less affected.
Product Pictures
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