Product Description

Normally in filtration acrylic refers to Homopolymer Acrylic, which is essentially made from **0% of Acrylonitrile. Occasionally less expensive lower performance Copolymer Acrylics are used. The following illustrates the chemical difference:
The thermal performance of the Homo Polymer is significantly better, see this following image which shows the two acrylic variants before and after exposure in air for 1 hour and 4 hours at **0°c, showing the progressive darkening due to oxidation: 
The major attributes of Acrylic fibre are its excellent resisitance to hydrolysis, it’s modest cost compared to high performance fibres and reasonably high temeperature resistance. 

Typical applications for acrylic needle felts are: 

• Power Generation
• Cement
• Smelting
• Limestone
• Asphalt

The srength of Acrylic is inherently quite low and sometimes this can be increased by mixing fibres with the likes of Polyester. Also, the weaving of the reinforcing scrim can be enhanced by mixing Acrylic yarns with Filament Polyester yarns. Even though Acrylic does not hydrolyse, a number of applications use an oil and water repellency treatment to reduce the tendency of moist or oily dust cakes adhering to the surface.

Being a synthetic fibre, there can be a possibility in certain applications for the needle felt to develop a static elecrtical charge and with some dust types; this can lead to a high explosion risk. The fabrics can be modified to dissipate this charge by incorporating either conductive fibres in the needle felt blend or, by utilising a conductive woven scrim. Stainless steel is the preferred fibre or yarn due to the conditions normally associated with acrylic fabrics.