A wide range of chemical treatments are available for the enhancement of felt properties, the major ones are as follows:

Moisture Resistance

A high performance chemical treatment applied by full immersion which is designed to give an enhanced resistance to modest hydrolytic attack. Hydrolysis cannot be stopped in susceptible fibers, but this treatment will delay its effects.

Easy Release

A treatment system designed to assist in the release of certain sticky dust types. The nature of a number of dusts is such that they have an adhesive nature and will bind to the surface of the needle felt. This system reduces that tendency and so aids in the cleaning of these difficult dusts.

Microporous Foam Surface Coating

This enhancement works by reducing the size of the pores in the surface of the needle felt so reducing the likelihood of particle penetration.

The system can be applied to most of our felt products and helps keep dust on the surface.  This type of coating is also used in product collection applications and aids in the collection of the product being produced and helps maximize yields.

Oil and Water Repellent

Is Lydall's standard liquid repellent system. It is applied by total immersion in a bath followed by drying and curing. This guarantees that every individual fiber in the felt is covered in a sheath of chemical which ensures very high and consistent levels of repellency. The treatment is available for application to almost the entire range of products and can frequently be used in conjunction with other product modifications.

Flame Retardant

Flame retardant chemistry enhances the flammability resistance of our felts to reduce the likelihood of flame propagation.

Acid Resistance

This coating is commonly used in applications with exposure to acidic environments and gases.  When used in these environments this coating can substantially extend the life of the filter media.

PTFE Treatment (Polytetrafluoroethylene)

This treatment system provides a durable coating of PTFE on the fibers which provides added chemical resistance in use.  This coating also aids in lamination to ePTFE membranes for certain types of felt that are difficult to laminate.

High Strength Coatings

Lydall has a family of coatings that can be added to the base felt to improve their physical properties.  These coatings can increase stiffness, tensile/tear strength, the pleatability, and dimensional stability of the product in final application. Different chemistries are available depending on the temperature and chemical environment necessary in application.