O-RING & SEAL - Melaka, Malaysia Custom Made Service, Supplier, Provider

O-RING & SEAL Melaka, Malaysia

Material Introduction
Polytetrafluoroethylene (PTFE)
Polytetrafluoroethylene (PTFE) has a melting point of 327°C, density of 2.18-2.39 g/cm³, and Shore hardness of D50-D55. It exhibits excellent chemical stability and self-lubricating properties, making it the most widely used and highest-volume fluoroplastic with outstanding comprehensive performance, including: resistance to high and low temperatures, corrosion resistance, anti-aging properties, non-adhesion, electrical insulation, high lubricity, and non-toxicity. However, PTFE has poor creep resistance, low wear resistance, and a high coefficient of thermal expansion, requiring filler modifications to address these shortcomings. Common fillers include copper powder, rubber fibers, glass fibers, carbon black, molybdenum disulfide, polybenzoxazole, and polyamide-imide. Depending on specific operating conditions and applications, one or several of these fillers may be used.

Polychlorotrifluoroethylene (PTCFE)
Polychlorotrifluoroethylene (PCTFE) has a melting point of 210–230°C and a density of 2.1–2.18 g/cm³, with specific grades such as D75 and D90. It exhibits excellent rigidity and corrosion resistance, with mechanical properties superior to polytetrafluoroethylene (PTFE) at room temperature. PCTFE has high compressive strength and low creep. Under low-temperature conditions, it demonstrates significant compressive resilience and retains a certain degree of elasticity even at -265°C, making it one of the best-performing polymer materials for ultra-low-temperature applications. It can be used long-term within a temperature range of -200°C to 125°C.
PCTFE seals have unique applications in advanced technological fields and are highly recommended for ultra-low-temperature environments involving liquid oxygen, liquid nitrogen, liquefied natural gas (LNG), and other cryogenic conditions, particularly in pipelines, pumps, valves, and containers.

Polyether Ether Ketone (PEEK)
Polyether Ether Ketone (PEEK) melting point of the closely packed rain-sheltering material is 334°C, with a density of 1.265–1.328 g/cm³, a Shore hardness of D82–D90, and a tensile strength of >92 MPa. Polyester rain-sheltering material is a special polymer material known for its high mechanical strength, resistance to high temperatures, impact, acids and alkalis, wear, fatigue, radiation, as well as excellent electrical insulation properties. The resin of polyester rain-sheltering material exhibits superior high-temperature performance and a relatively high melting point. Its continuous service temperature is 260°C, and when reinforced with glass or carbon fibers, its load-bearing heat deflection temperature can reach up to 316°C. It is primarily used in aerospace, automotive industries, electronics, electrical applications, and medical devices.

Ultra-high-molecular-weight polyethylene (UHMWPE)
The molecular weight of cross-linked polyethylene has a melting point of 130-136°C and a density of 0.94 g/cm³, with a hardness range of D40 to D60. It combines nearly all the superior properties of plastic materials: impact resistance, wear resistance, chemical corrosion resistance, low friction coefficient, excellent self-lubrication, and exceptional mechanical performance in ultra-low temperature environments. It retains high impact resistance at -70°C and maintains toughness and strength at -196°C. It is almost non-absorbent and does not swell. Compared to polytetrafluoroethylene (PTFE), it exhibits better wear resistance and anti-creep properties. Light sand slurry wear tests have demonstrated its wear resistance to be 6.6 times that of ordinary copper.
The recommended long-term working temperature range is -180°C -70°C. It is suitable for applications requiring high sliding performance or where lubrication is poor, high wear resistance is needed, or the medium contains water and is prone to dry friction. It is also commonly used for sealing in ultra-low temperature environments. Its drawbacks include insufficient tensile strength, poor high-temperature resistance, low hardness, and low thermal conductivity.

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