Polypropylene (PP)
What is polypropylene (PP)? Polypropylene has a relatively high crystallization (60 – 70 %) with a density of 0.900 – 0.915 g/cm³ and is therefore a polymeric, semi-crystalline thermoplastic. Compared to polyethylene, PP has high rigidity and hardness, although its impact strength is significantly lower. Polypropylene can be used at temperatures of up to 120 […]
Polyethylene (PE)
What is polyethylene (PE)? The semi-crystalline thermoplastic polyethylene is obtained from the polymerization of ethylene. A distinction is made between the low-density(LD) and the high-density (HD) form. Due to the strong branching between the polymer chains, LDPE is difficult to crystallize and therefore has a low density. HDPE, on the other hand, consists of linear […]
Polyethylene (PE)
What is polyethylene (PE)? The semi-crystalline thermoplastic polyethylene is obtained from the polymerization of ethylene. A distinction is made between the low-density(LD) and the high-density (HD) form. Due to the strong branching between the polymer chains, LDPE is difficult to crystallize and therefore has a low density. HDPE, on the other hand, is a linear […]
Epichlorohydrin rubber (ECO)
What is epichlorohydrin rubber (ECO)? Co-polymer of epichlorohydrin and ethylene oxide, which is usually cross-linked via metal oxides. It is characterized in particular by good resistance to mineral oil and grease, which also applies to NBR surpasses. It also has good resistance to ozone and acids, as well as good flexibility at low temperatures. cold […]
Polyacrylate rubber (ACM)
What is polyacrylate rubber (ACM)? Polyacrylate rubber is produced by polymerizing acrylic acid to acrylic acid ester. They have very similar properties to ethylene-acrylic elastomers in that they are highly resistant to heat, oxygen and ozone. In addition, ACM has good swelling resistance to mineral oils, unlike AEM. However, the elasticity and the cold behavior […]
Chlorosulfonyl polyethylene rubber (CSM)
What is chlorosulfonyl polyethylene rubber (CSM)? Polyethylene that has been chlorinated or sulphonated in some places. The exact chlorine or sulphur content has a significant influence on the properties. However, it can be said that CSM generally has a high resistance to ozone, weathering, ageing, radiation and flames. It is also resistant to chemicalsespecially oxidizing […]
Ethylene-acrylic elastomer (AEM)
What is ethylene acrylic elastomer (AEM/AECM)? The AEM is a co-polymer of ethylene, acrylate and a cross-linking carboxyl group. The ethylene unit forms the soft segment. The rubber can be peroxidically cross-linked via the carboxyl group. crosslinked crosslinked via the carboxyl group. The rubber has high mechanical properties as well as good resistance to heat, […]
Butyl rubber (IIR)
What is butyl rubber (IIR)? Butyl rubber (IIR) is a co-polymer of isobutylene and isoprene, usually consisting of 95 – 99 % isobutylene and only 0.8 – 5 mole percent isoprene. Compared to other elastomers, IIR has a high resistance to heat, ozone and chemicals, chemicals– and ageing resistance. In addition, IIR has a very […]
Styrene butadiene rubber (SBR)
What is styrene-butadiene rubber (SBR)? The oldest synthetic rubber is SBR. It is also the most widely used synthetic rubber to this day, as together with natural rubber used in tire construction. In terms of its structure, it was very similar to NR at the time, resulting in similar properties. Compared to NR, SBR has […]
Calendering
What is calendering? During calendering, the rubber usually runs over two to four rollers, the temperature of which can be controlled. The arrangement and temperature of the rollers can be used to determine different shapes and properties of the material. As with extrusion the molded parts can be processed for any length of time. Films […]
Injection molding process
What is the injection molding process? In the injection molding process, the rubber compound is injected into a tool. The injection molding machine is operated in a similar way to an extruder driven by a screw, which presses the rubber in front of it. The occurrence of extrusion can be largely avoided, which means that, […]
Transfer presses
What is transfer pressing? Unlike the compression moldingin transfer molding, the rubber compound initially remains next to the forming tool. By applying pressure, the rubber is then pressed into the mold via sprue channels. Here too, heating up the mold can start the vulcanization process. vulcanization can be connected directly. The pressure required for this […]
Printing presses
What is pressure pressing? Pressure pressing is a processing method in which the rubber compound is placed in a preheated mold and pressed into the desired shape. The ability to heat can also be used to vulcanization can be connected directly. Compression molding requires only moderate pressure, but it requires a lot of manual work. […]
Processing
How is rubber processed? The processing of rubber parts can be roughly divided into two groups: Processing in closed molds achieves the production of individual specially molded rubber parts and includes compression molding, transfer pressing and injection molding. For endless molded rubber strands (hoses, cables, etc.), special processing methods such as extrusion and calendering.
Chemical resistance
What is chemical resistance? Different rubber compounds are susceptible or resistant to different media. The typical risk contact media include oils, solvents, acids, bases, gases and water vapor. Depending on the area of application and potential contact media, the rubber material should be selected with care. According to DIN 53521, the extent to which the […]
Tear propagation resistance
What is the tear resistance? The tear propagation resistance indicates the force a rubber can exert against being pulled apart after the structure of the rubber has been weakened by an incision. The pulling direction is perpendicular to the incision. The unit is N/mm. There are two methods of determination. In the strip test according […]
