Material Descriptions
White Knight procures polymer materials from from reputable sources within our ISO-9001 Quality Control System. Our materials conform to national standards.
Materials listed alphabetically
FEP – Fluorinated ethylene propylene (FEP) is a copolymer of hexafluoropropylene and tetrafluoroethylene. It differs from the polytetrafluoroethylene (PTFE) resins.
FEP Data Sheet (PDF)
ECTFE – Polyethylene Chlorotrifluoroethylene (ECTFE or Halar®) is a copolymer of ethylene and chlorotrifluoroethylene. It’s a semi-crystalline, whitish thermoplastic with good chemical resistance. ECTFE is resistant to acids, caustics, oxidizing agents, and many solvents.
Halar Data Sheet (PDF)
HDPE – High-Density Polyethylene (HDPE or PEHD) is a polyethylene thermoplastic that provides excellent impact resistance, high tensile strength, low moisture absorption and is highly resistant to chemicals and corrosion. It is commonly used for containers for milk, motor oil, shampoos, soaps, detergents, and bleaches.
HDPE Data Sheet (PDF)
PC – Unfilled Polycarbonate (PC) is a tough, transparent engineering thermoplastic which offers very high impact strength and high modulus of elasticity. It also has a high heat deflection temperature and absorbs very little moisture. These properties, plus good low frequency and high voltage insulating characteristics, make polycarbonate a prime material for electrical and electronic components. Its strength, impact resistance and transparency (unfilled grades only) also make it an ideal material for certain transparent structural applications.
PC Data Sheet (PDF)
PEEK – Polyetheretherketone (PEEK) is a semicrystalline thermoplastic with excellent mechanical and chemical resistance properties that are retained in high temperatures. It melts around 343°C (662°F) and is highly resistant to thermal degradation as well as attack by both organic and aqueous environments. While not the best material for a direct contact with heated chemicals, PEEK’s robustness and machinability make it ideal for bath lids, hinges, screws, etc. Even in a harsh chemical environment, PEEK provides the durability of metal without compromising purity. PEEK is a strong, chemical and heat- resistant thermoplastic. Biocompatibility allows for use in medical applications. Frequently used as bearing material and as structural components in high performance plastic devices. Service temperatures up to 150°C (300°F).
PEEK Data Sheet (PDF) | PEEK Chemical Compatibility
PFA – Perfluoroalkoxy (PFA) is a type of fluoropolymer with properties similar to PTFE. PFA shares PTFE’s useful properties of low coefficient of friction and non-reactivity, and is of a higher purity than PTFE. It can also be molded and welded, making it better suited for bath fittings. PFA is an excellent choice for HF applications, since HF cannot be used with quartz, and it is critical to have no metallic contamination. PFA has exceptional heat resistance, excellent chemical and weather resistance. Ideal for corrosive and high temperatures 260°C (500°F) applications. Suitable for molding and critical components in valves and pumps.
PFA Data Sheet (PDF)
PMMA – Polymethyl methacrylate (PMMA or Acrylic) is a transparent and impact-resistant thermoplastic used as an engineering plastic. It’s also known as acrylic, acrylic glass, or plexiglass. It is a synthetic polymer derived from methyl methacrylate.
PMMA Acrylic Data Sheet (PDF)
POM – Polyoxymethylene (POM or Delrin®) is a high-performance engineering plastic used to make precision parts. It’s also known as acetal, polyacetal, and polyformaldehyde.
POM Data Sheet (PDF) | Delrin Chemical Compatibility
PP – Polypropylene (PP or Polypro) is a common thermoplastic polymer. One of most versatile high purity polymers used in a wide variety of clean and corrosive applications. It is rugged and resistant to many chemical solvents, bases and acids. Service temperature up to 60ºC (140ºF).
Polypropylene Data Sheet (PDF) | Polypropylene Chemical Compatibility
PTFE – Polytetrafluoroethylene (PTFE or Teflon®) Is the material of choice for low-friction applications. Excellent heat and chemical resistance. Suited for most corrosive and high temperatures 240°C (460°F) applications. Chemical inertness makes it difficult to bond and weld. It is a chemical compound that is very non-reactive, partly because of the strength of carbon–fluorine bonds, and so it is often used in containers and pipework for reactive and corrosive chemicals. PTFE is a white solid at room temperature, with a density of about 2.2 g/cm³. According to DuPont its melting point is 327°C (620.6°F), but its properties degrade above 260°C (500°F). Because of its chemical inertness, PTFE cannot be cross-linked like an elastomer. Therefore it has no “memory,” and is subject to creep, also known as “cold flow” and “compression set”. A little bit of creep allows PTFE seals to conform to mating surfaces better than most other plastic seals. Too much creep, however, and the seal can be compromised.
PTFE Data Sheet (PDF) | PTFE Chemical Compatibility
PVC – Polyvinylchloride (PVC) is a rigid strong polymer. The work horse of daily-use plastics. PVC is common for enclosures, plumbing and flow devices. However, it will degrade with UV exposure and is susceptible to chemical corrosive attack. Service temperatures up to 70°C (160°F).
PVC Data Sheet (PDF) | PVC Chemical Compatibility
PVDF – Polyvinylidene Fluoride (PVDF or Kynar®), is a highly non-reactive and pure thermoplastic fluoropolymer. It is generally used in high purity applications that require strength and resistance to solvents, acids, bases, and heat. Its low melting point (around 177°C) make it easier to melt than other fluoropolymers and has a relatively low density (1.78) and low cost. It is commonly available as wire insulator, piping, sheet, tubing, films, or plate. It is ideal for a variety of applications such as pumps, valves, sheet products, pipes, tubes and fittings needing excellent chemical resistance and operating temperatures up to 150°C (300°F).
PVDF Data Sheet (PDF) | PVDF Chemical Compatibility
Quartz is a mineral that is commonly found in and on the earth’s crust, a combination of silica and oxygen (SiO2). Despite being a commonly occurring substance, pure quartz has a number of extraordinary properties that make it ideal for Semiconductor and other ultra-pure processes. Unlike glass, which contains some reactive metallic elements, pure quartz is almost inert and does not react with most other substances. Even at moderately high temperatures, it is very chemically stable. (Some notable exceptions are hydrofluoric acid, HF, or alkaline substances such as KOH). Along with its low reactivity, quartz has a Mohs hardness of 7 and a lack of cleavage that make it desirable for grueling, yet clean, applications. However, quartz’s durability also makes it exceptionally difficult to mold and weld. The fabrication and machining of quartz vessels and parts require the skills of an experienced and talented craftsman.
SS – Stainless Steel (SS or SST) also known as inox steel or inox, is defined as a steel alloy with a minimum of 11% chromium content by mass. Stainless steel does not stain, corrode, or rust as easily as ordinary steel. Alloys with a suitable purity for Semiconductor applications are determined by SEMI. Common applications include flammable solvents or detergents or other applications where metallic contamination isn’t an issue.
ACRYLITE® is a trademark of Cyro Industries.
DELRIN® is a registered trademark of DuPont.
HALAR® is a registered trademark of Solvay Solexis.
HOSTAFLON® is a registered trademark of Hoechst Celanese.
HYFLON® is a registered trademark of Ausimont USA, Inc.
KYNAR® is a registered trademark of Elf Atochem North America.
LEXAN® is a registered trademark of SABIC Innovative Polymers (formerly GE Plastics).
LUCITE® is a trademark of ICI Acrylics Inc.
NEOFLON® is a registered trademark of Daikin America.
PEEK® is a trademark of Victrex USA, Inc
PLEXIGLAS® is a registered trademark of Altuglas International / Arkema.
TEFLON® is a registered trademark of DuPont.
ZELUX® is a registered trademark of Westlake Plastics.