3. OTHER MATERIALS

GASKETS

ELESA normally uses gaskets made of synthetic nitrile butadiene rubber (NBR) or acrylonitrile butadiene rubber (BUNA N) for its products, with hardness values ranging from 70 to 90 SHORE A depending on the type of product considered.

The working temperature range for continuous use is -30°C to +120°C. Where a higher chemical and thermal resistance is required, that is, for products in the HCX-SST, HCX-SST-BW and HGFT.HT-PR series, gaskets made of FKM fluorinated rubber are used.

For chemical resistance values, see the table in chapter 10 (on pages A30, A31 and A32).

The working temperature range is from -25°C to +210°C.

On request and for sufficient quantity, flat washers and O-rings made of special materials such as EPDM, silicone rubber, or others may be supplied.

AIR FILTERS for filler breather caps (SFN., SFP., SFV. and SFW. series):

• TECH-FOAM type filters: polyester-based polyurethane foam mesh, degree of filtration 40 microns, recommended for temperatures of between -40°C and +100°C for continuous use, and brief peak temperatures of +130°C. This material does not swell in contact with water, petrol, soap, detergents, mineral oils or grease. Some solvents may cause slight swelling of the foam (benzene, ethanol, and chloroform);
  
   
• TECH-FIL type filters: made of zinc-plated iron wire (quality as per DIN 17140-D9-W.N.R 10312, zinc-plated as per DIN 1548), degree of filtration 50-60 microns.