Hydex / PBT (Polybutylene terephthlate)

PBT (polybutylene terephthlate) is a polyester that has good chemical and impact resistance, a low coefficient of friction, moderate temperature resistance and outstanding machinability. It does not crack or craze in chlorine nor does it chip or contaminate food products. PBT is approved for direct food contact.

PBT (Polybutylene terephthalate) is one of two basic forms of polyester materials available in machinable stock shapes today. PBT offers high impact resistance along with excellent resistance to typical cleaning chemicals chlorine and caustic solutions. PBT differs from PET in that PBT has a lower strength and stiffness but this in turn increases the impact resistance of PBT. PBT also has a lower glass transition temperature. Both however are susceptible to hot water or steam if operating above 140° F. Both PBT and PET retain more of their physical properties at elevated temperature when compared to Acetal and Nylon. Internal lubricants can be added to enhance the wear resistance and coefficient of friction when compared to unfilled versions or Delrin AF. PBT has good electrical insulation properties and has good dimensional stability. PBT is approved for direct food contact by the FDA and is an ideal material for food processing equipment.

HYDEX 4101 & 4101L (lubricated) is a very stable chemical compound that can withstand high impact without deterioration. It is approved for direct contact with food by the FDA and is ideal for machined parts in food processing equipment. HYDEX 4101 has excellent resistance to typical cleaning chemicals such as chlorine and caustic solutions and has a very low moisture absorption rate, as much as 15 times less than nylon.

Applications

Typical applications include food piston pumps, valves and valve bodies, timing screws, gears, cams, bushings and bearings, wear strips, fuel pump components, and fuel system connectors and rotors, feeder blocks.

KEY PROPERTIES

No center line porosity, Superior chemical resistance, Low coefficient of friction, Good impact strength and ductility, Hard and durable surface, FDA, USDA, 3A Dairy approved grades, Replaces brass, aluminum, steel, UHMW, acetal, very low moisture absorption rate, excellent machining qualities.

Standard Shapes and Forms

Sheet: .250” – 4” thick

Rod: .250” – 6” diameter

Grades and Colors

PBT, Lubricated

Lubricated PBT is an enhanced version with improved wear, PV range and lubircity over unfilled PBT.

Hydex / PBT (Polybutylene terephthlate) Pictures