Sintering compacts and forms a solid mass of material by heat or pressure without melting it to the point where it liquifies. Depending on the following factors, sintered thermoplastics will have both artificial pores and large natural pores of varying size:

  • Size distribution of the plastic powder particles

  • Compacting pressure

  • Amount of heat applied

  • Amount of time during which heat and pressure have been applied   

Typical pore sizes range from about 5 microns to 350 microns. Typical void volumes range from 30% to 50%, but can be produced with up to 70% . Pore size and void volume affect how well a porous thermoplastic media will vent, diffuse, filter, or serve as a type of barrier protection. Additionally, pore size and void volume will affect how permeable that media will be to air, and how water resistant or waterproof that material will be in different environments.

Polystar Technologies carefully engineers and controls pore size and void volume through consultation with our customers, selection of specific polymers and process control. Our sintered porous plastic can be manufactured from a wide variety of polymers including: