Home > POM

POM Japan DURACON GB-25 glass beads 25% enhanced high rigidity low warp polyoxymethylene

Item No.: GB-25
Polyoxymethylene: Polyoxymethylene, polyoxymethylene (POM), also known as sai steel and special steel, is obtained by polymerization of formaldehyde and other raw materials. Pom-h (formaldehyde homopolymer), pom-k (formaldehyde copolymer) is a high-densit


Editing Functions
(1) POM can be used without drying before drying. It is best to preheat the process (about 80 ° C), which is good for product size stability.
(2) The processing temperature of the POM is very narrow (0 ~ 215 ° C). When the residence time in the cylinder is slightly longer or the temperature exceeds 220 ° C, it decomposes and releases formaldehyde stimulating gas.
(3) When the POM material is injected, the holding pressure must be high (similar to the injection pressure) to reduce the pressure drop, the screw speed should not be too high, and the residual quantity should be less;
(4) POM products have a greater degree of shrinkage and are prone to shrinkage or deformation. POM is more heat and has a high mold temperature (80 to 100 ° C). The product is very hot when it is released from the mold. It is necessary to prevent finger burns.
(5) POM should be formed under conditions of “medium pressure, medium speed, low material temperature and high mold temperature,” and the mold temperature should be controlled during the molding of precision products.
(6) High mechanical strength and rigidity
(7) highest fatigue strength
(8) Good environmental resistance and resistance to organic solvents
(9) Strong resistance to repeated shocks, good electrical properties, good repair, self-lubrication, good wear resistance, excellent dimensional stability.
Editing the application
Can replace most non-ferrous metals, automobiles, machine tools, tool parts, bearings, fasteners, gears, springs, pipes, accessories for conveyor belts, electric water tanks, pump bodies, dryers, taps, etc.
Physico-chemical editing
Overall performance
POM is a solid, dense material with a smooth shiny surface, light yellow or white, and the thin-walled part is translucent. The burning characteristics burn easily and continue to burn after a fire: the upper end of the flame is yellow, the lower blue, fused and dripping, as well as the strong irritating smell of formaldehyde and the smell of fish. POM is a white powder, usually opaque, good dyeing, specific gravity 1.41-1.43 g / cm3, molding shrinkage 1.2-3.0%, molding temperature 170-200 ° C, drying conditions 80-90 ° C 2 hours. The long-term POM heat resistance is not high, but in the short term it can reach 160 ° C. The short-term POM heat resistance of homopolymerized POM is above 10 ° C, but the long-term heat resistance of copolymerized POM is about 10 ° C higher than that of homopolymerized POM. It can be used for a long time in the temperature range from -40 ° C to 100 ° C. POM easily decomposes and has a decomposition temperature of 240 degrees. Irritant and corrosive gases occur during decomposition, therefore, the casting steel must be made of corrosion-resistant materials.
(1) POM is a crystalline plastic with a density of 1.42 g / cm3, has good steel properties and is commonly known as “Saigang”.
(2) It has excellent characteristics, such as fatigue resistance, creep resistance, wear resistance, heat resistance and impact resistance, and also has a small friction coefficient and good self-lubricating ability.
(3) POM does not easily absorb moisture, its water absorption is 0.22 ~ 0.25%, its dimensional stability is good in a wet environment, its shrinkage is 2.1% (larger), the size is difficult to control during injection molding, and the temperature heat distortion is 172 ° C. POM has two types of homoformaldehyde, performance is different (homoformaldehyde is better heat resistance).
Mechanical properties
POM has high strength, high rigidity, good elasticity and good wear resistance. Its mechanical properties are excellent, the specific strength can reach 50.5 MPa, the specific rigidity can reach 2650 MPa, and it is very close to the metal. The mechanical properties of POM vary little with temperature, and copolymerized POM varies slightly more than homopolymerized POM. The POM impact strength is higher, but the usual impact load is less than that of ABS and PC, POM is tear-sensitive, and the break can reduce the impact strength by as much as 90%. POM fatigue strength is very noticeable: after 10 alternating loads, fatigue strength can reach 35 MPa, while PA and PC are only 28 MPa. The creep of POM is similar to the creep of POM, which is only 2.3% at 20 ° C, 21 MPa and 3000 hours, and temperature has little effect on it. POM has a low friction coefficient and good wear resistance (POM> PA66> PA6> ABS> HPVC> PS> PC), the PV limit is large, and the self lubrication property is good. POM products are subject to noise-like noise under high loads.
Electrical specifications
POM has good electrical insulation and is virtually independent of temperature and humidity, the dielectric constant and dielectric losses vary little over a wide range.