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U. Bajorska


The effect of degree of disintegration of suspension polytetrafluoroethylene (Tarflen)

on the properties of moulded articles

Polimery 1990, No 3, 75


DOI: dx.doi.org/10.14314/polimery.1990.075


Summary
The effect of the degree of disintegration of suspension polytetrafluorothylene (Tarflen) in the range of the average diameter (d50) of particles of 85—1400 μm on the properties of articles compression moulded from powder in hydraulic presses under pressure varying in the range of 5—35 MPa has been determined. It has been found that the lower is the size of particles of PTFE powder compression moulded, the higher is the tensile strength and the relative elongation at break, and the lower is porosity and shrinkage after sintering, and the higher is the compression ratio. Articles from PTFE powder of particles with diameter below 100 μm can be compression moulded under pressures 10—20 MPa without any risk of porosity whereas some articles such as e.g. strips moulded from powders with larger diameter of particles (e.g. with average particle diameter d50=400 μm) even under much higher pressure (35 MPa) are heterogeneous and contain grains of non-compressed powder.


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