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High temperature moisture resistant sealant
Static sealing
PTFE gasket with low creep relaxation A new PTFE asbestos-free gasket material called UCAR-323 “LC” has been launched by LJCAR Carbon. Its advanced composite construction of woven continuous glass instead of fused beads or fibres gives the material superior shape retention qualities during high temperature service. The gasket has a soft easy to handle surface with a hard interior, and the company quotes a tensile strength of 12,000 psi. UCAR 323 “LC” exhibits stability and creep relaxation of less than 3% in temperatures from -350°F to 475°F and maintains high bolt retention and good sealing in thermal cycling applications and under continuous exposure to elevated temperatures. The material gives up to 14 times the sealability rate of a low creep PTFE material when only low clamping force is available, with 70% less creep and an absorption rate less than 0.1%. It is non-conductive, and hence suitable for electrical isolation services on pipes and equipment and is also resistant to a wide range of chemicals including strong mineral acids and oxidising agents. Contact: UCAR Carbon Company Inc., PO Box 94367, Cleveland OH 44101, USA. Tel: +l 216 529 3777; Fax: +1216 3888. Typical materials moulded are explosive decompression resistant Elast-O-Lion hydrogenated nitriles and fluoroelastomers as well as a variety of other fluorocarbon grades, fluorosilicones and specialist compounds. Many of the seals are used in high integrity equipment for oil production and exploration, chemical plants, nuclear plants and the semiconductor industrys. With the new presses the company has also perfected a process for bonding Elast-O-Lion to metal components. Flexible work patterns enable the new line to work at optimum efficiency. The largest of the Fabes presses has a 700 mm square platen and operates at 300 tonne closing force. The other two are 600 mm models with 230 tonne closing force. Each has its own computerised system that sets and monitors all working parameters: degassing cycle curing cycle, mould temperature, hydraulic pressure and platen closing speed. Each job is programmed into the controller and held in memory, giving repeatability every time another production run is made from the same mould. The mould preheater saves production time by bringing tools up to working temperature before they are iltted to a press. A roller conveyor transports the new tools to a press so production can start almost immediately. Mould tools are changed about ten times a day, and production schedules planned so that one set is always heating up while three are in use.
A high temperature compound, Pyro-Putty 2400-I-S, has been developed by Aremco Products, for sealing seams and joints in stainless steel housings used in sterilization equipment by the food packaging industry. The material is a single part, ceramic/metallic filled system which demonstrates high moisture resistance and operates effectively to 200°F. This compound bonds well to stainless steel and cast iron, and demonstrates a high resistance to thermal cycling. These properties make Pyro-Putty a suitable replacement for non-structural weldments which typically fatigue, crack and fail rapidly at high temperature. The compound is resistant to fuels, solvents and other corrosives. When applied in thin cross-sections of less than 0.60 in, it will set at room temperature in 2 - 3 hours and can be immediately placed in operation.
Contact: James Walker h Co Ltd. Lion House, Waking, Surrey GU22 8AP, UK. Tel: +44 1483 757575, Fax: +44 1483 755711.
Contact: Aremco Products Inc., PO Box 429, Ossinhg, NY 10562-0429, USA. Tel: +1914 762 0685; Fax: +1914 762 1663.
4
High temperature moisture resistant sealant
Sealing Technology
No. 30
PTFE gasket with low creep relaxation A new PTFE asbestos-free gasket material called UCAR-323 “LC” has been launched by LJCAR Carbon. Its advanced composite construction of woven continuous glass instead of fused beads or fibres gives the material superior shape retention qualities during high temperature service. The gasket has a soft easy to handle surface with a hard interior, and the company quotes a tensile strength of 12,000 psi. UCAR 323 “LC” exhibits stability and creep relaxation of less than 3% in temperatures from -350°F to 475°F and maintains high bolt retention and good sealing in thermal cycling applications and under continuous exposure to elevated temperatures. The material gives up to 14 times the sealability rate of a low creep PTFE material when only low clamping force is available, with 70% less creep and an absorption rate less than 0.1%. It is non-conductive, and hence suitable for electrical isolation services on pipes and equipment and is also resistant to a wide range of chemicals including strong mineral acids and oxidising agents. Contact: UCAR Carbon Company Inc., PO Box 94367, Cleveland OH 44101, USA. Tel: +l 216 529 3777; Fax: +1216 3888. Typical materials moulded are explosive decompression resistant Elast-O-Lion hydrogenated nitriles and fluoroelastomers as well as a variety of other fluorocarbon grades, fluorosilicones and specialist compounds. Many of the seals are used in high integrity equipment for oil production and exploration, chemical plants, nuclear plants and the semiconductor industrys. With the new presses the company has also perfected a process for bonding Elast-O-Lion to metal components. Flexible work patterns enable the new line to work at optimum efficiency. The largest of the Fabes presses has a 700 mm square platen and operates at 300 tonne closing force. The other two are 600 mm models with 230 tonne closing force. Each has its own computerised system that sets and monitors all working parameters: degassing cycle curing cycle, mould temperature, hydraulic pressure and platen closing speed. Each job is programmed into the controller and held in memory, giving repeatability every time another production run is made from the same mould. The mould preheater saves production time by bringing tools up to working temperature before they are iltted to a press. A roller conveyor transports the new tools to a press so production can start almost immediately. Mould tools are changed about ten times a day, and production schedules planned so that one set is always heating up while three are in use.
A high temperature compound, Pyro-Putty 2400-I-S, has been developed by Aremco Products, for sealing seams and joints in stainless steel housings used in sterilization equipment by the food packaging industry. The material is a single part, ceramic/metallic filled system which demonstrates high moisture resistance and operates effectively to 200°F. This compound bonds well to stainless steel and cast iron, and demonstrates a high resistance to thermal cycling. These properties make Pyro-Putty a suitable replacement for non-structural weldments which typically fatigue, crack and fail rapidly at high temperature. The compound is resistant to fuels, solvents and other corrosives. When applied in thin cross-sections of less than 0.60 in, it will set at room temperature in 2 - 3 hours and can be immediately placed in operation.
Contact: James Walker h Co Ltd. Lion House, Waking, Surrey GU22 8AP, UK. Tel: +44 1483 757575, Fax: +44 1483 755711.
Contact: Aremco Products Inc., PO Box 429, Ossinhg, NY 10562-0429, USA. Tel: +1914 762 0685; Fax: +1914 762 1663.
4
High temperature moisture resistant sealant
Sealing Technology
No. 30