Bonded Materials at www.japanese-home-gardens.com

Cartridges manufactured from bonded materials, such as glass microfibres bonded together by a phenolic resin (for general purposes) or melamine (for food, beverage and pharmaceutical applications) are in common usage. The microfibres have a controlled size ranging from about 0.5 p,m to over 150 p,m; they are sprayed with resin and then formed into felt-like mats which are cut into predetermined lengths and rolled onto various sized mandrels. The mandrel then becomes the core of the cartridge, and is typically made of polypropylene, coated or stainless steels, or resin impregnated materials.

Refractory ceramics have been developed for use in the oxygen-processing method of steelmaking. These processes required new or improved refractory materials for containing the steel under severe conditions. "Direct-bonded" and fused cast types of chrome magnesite refractories is well as high-purity magnesia and tar-bonded dolomites have been developed. Such refractories lave allowed utilization of existing furnaces, while permitting higher temperatures and more severe widation and reduction conditions than were pos-iible with the old refractories.

After curing, each tube is ground to the required diameter. Bonded cartridges are available of similar form but made from other fibres such as acrylic or cellulose. Nominal ratings of such cartridges are from about 2 /wn to 125 p,m. Also available are thermoplastic bonded cartridges made from polymers such as polypropylene, that give efficiencies of up to 99.999% against 0.3 ^m bacterium.