Polyester is the most versatile, most cost-effective and most widely used filter media for dust collection. It is strong, abrasion resistant can work up to 150°C and has good resistance to common acids, solvents and oxidizing agents. Its one weakness is a tendency to hydrolyze which results in a loss of strength and toughness as the fibers break down and turn to powder.

Polyester, being a "commodity" fiber, is available in a significant range of deniers (effectively diameters) and so a wide range of needlefelt products can be designed to match the demands of the filter; from very high collection efficiency (with very fine fibers) to low efficiency products (using coarse fibers) where flow is more important than collection.

A wide variety of chemical and thermal treatments are available for polyester, the most common being superglaze to improve dust release and liquid repellency to assist with sticky dusts.

ACIDS – GOOD

ALKALIS – FAIR

OXIDIZING AGENTS – GOOD

HYDROLYSIS – POOR

SOLVENTS – GOOD

Avoid strong alkali and acid environments at elevated temperatures – the most versatile of the low temperature fibers, used in the cement and quarry, metal processing, flour and wood industries.

MAXIMUM CONTINUOUS IN DRY CONDITIONS: 150°C / 302°F

MAXIMUM SURGE IN DRY CONDITIONS:  160°C / 320°F