PBI / Celazole® Compression Molding
PBI / Celazole® Compression Molding
PBI / Celazole® Compression Molding
PBI (polybenzimidazole) is a highly stable linear, wholly aromatic molecule, characterized by high thermal stability and outstanding strength. PBI has perhaps the best high-temperature properties of any commercially available polymer.
PBI / Celazole® Properties
•Highest glass-transition temperature (Tg) (427°C, 801°F) of any thermoplastic
•Highest heat deflection temperature (HDT) of any thermoplastic (435°C, 815°F at 264 psi)
•Can withstand brief exposure up to 760°C (1400°F)
•Retains its properties down to -196°C (-321°F)
•No known melting point (does not melt)
•Doesn’t burn
•Produces little smoke or out-gasses (besides water) at 538°C (1000°F)
•Excellent tensile and flexural strength
•Highest dimensional stability of any unfilled plastic
•Highest compressive strength of any unfilled plastic
•Especially high strength during compression and after recovery from compression
•Excellent hardness
•Flex-fatigue resistant
•Excellent wear resistance
•Superior abrasion resistance
•Ultrasonic transparency
•Very good plasma resistance
•High volume resistivity
•Excellent thermal insulator
•Resists many harsh chemical environments but is attacked by aprotic solvents and (at high temperatures) by strong aqueous acids and alkalis
•Low coefficient of friction
•Relatively low coefficient of thermal expansion, similar to aluminum
•Slowly absorbs a high percentage of water but won’t react with it, is hydrolytically stable and resistant to high-pressure steam
•Compatibility with other polymers, including polyaryletherketones (PAEK) such as PEEK
•Very expensive
PBI / Celazole® Applications
Because PBI can perform in severe high-temperature chemical or plasma environments where other plastics fail (even PEEK, PI, PEI, PAI and PPS), PBI is usually specified for use in extremely harsh environments. Examples would include 400-500 °F exposures to oil, methane, sour gas, hydrogen sulfide, steam, corrosion inhibitors, hydraulic and heat-transfer fluids, chlorinated solvents and brine.
PBI is molded and machined to make precision parts for many industries:
•Aerospace
•Chemical processing
•Glassmaking
•Liquid-crystal display (LCD) panel manufacturing
•Petrochemical
•Photovoltaic (PV) panel manufacturing
High-purity/ultra-low metal ion content grade PBI is used in:
•Dry etch chambers
•Sputtering systems
•Chemical vapor deposition (CVD)
•Physical vapor deposition (PVD)
•Spin coating
Where static discharge is a concern, electrostatic dissipative grade PBI is used. This grade contains carbon fiber for increased conductivity.
Because other plastics (such as polyester, nylon, PEEK and PES) in their molten state won’t stick to PBI, it is used to make certain components for plastic production and molding equipment.
PBI can be blended with PEEK and is available in unfilled, lubricated, glass-filled and carbon-filled grades.
PBI is well suited for use in fluorinated plasmas.
Compression-molded PBI / Celazole® Parts
•Bushings
•Insulator bushings
•Seals
•Contact seals
•Bearings
•Thrust washers
•Thermal isolators
•Guide rollers
•Wear plates
•Electrical insulating parts
•Nose cones
•Leading edges
•Ablative heat shields
•Jet engine parts
•Oxide etch chamber parts
•Chemical vapor deposition (CVD) chamber seals
•Etch chamber lifting pins
•Interior chamber screws and components
•Focus rings
•Wafer clamps and contact pads
•Wafer retaining clamps
•Sputtering chamber clamps and components
•Vacuum tips
•Wafer carriers
•Physical vapor deposition (PVD) tools
•Spin coating tools
•Probe tip lenses for ultrasonic measuring devices
PBI Compression Molding Resins
Celazole® PBI from PBI Performance Products
•Celazole® U-60 PBI
•Celazole® U-60SD PBI
•Celazole® U-60ESD PBI
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PBI / Celazole® Compression Molding
Compression Molding and Machining of PBI / Celazole®.
Teflon® Coating / Spray Coating
Chemours Teflon Industrial Licensed Applicator
Whitford Licensed Applicator
PI / Vespel®
PPS / Ryton®
PES
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