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78019
Description: Ex BR 2-6-0 Class 2 No.78019 switching tracks ay Leicester North Station ready for the next train to Loughborough on the Great Central Railway 21/04/2013
Keywords: BR, 78019, Central, Steam
Date: 15.06.2013 14:47
Hits: 2570
Downloads: 0
Rating: 5.00 (5 Vote(s))
File size: 335.4 KB
Added by: Guest

IPTC Info
Object name: 78019
Keywords: Great Central Railway, Leicester North

EXIF Info
Make: SONY
Model: SLT-A77V
Exposure time: 1/400
Aperture value: F/8
ISO speed: 200
Date created: 21.04.2013 10:39:58
Focal length: 45mm

Author: Comment:
ptfeglass
Member

Join Date: 09.11.2013
Comments: 1
Self Adhesive Teflon Tape and crushed. These shortcomings can be improved by adding appropriate filler and the parts of the structure

When PTFE is used as the sealing gasket for sealing, and the bolts are screwed tightly, so that more specific compression stress, the washer "cold" (creep) and crushed. These shortcomings can be improved by adding appropriate filler and the parts of the structure, the method to overcome. The melt viscosity of PTFE is very high, also do not flow at high temperature. The melting point (327 ?) above, the melt viscosity at 1010 Pa.s, even when heated to decomposition temperature is not flow, forming method which makes it cannot use general thermoplastics, but we use the sintering process of powder metallurgy forming similar. PTFE has outstanding not sticky, which limits its application in industry. It is an excellent anti adhesive materials, the performance and make its surface and other objects of adhesion is very difficult. The thermal conductivity of PTFE is low, poor heat conductivity, which not only hinder it is used as a bearing material, but also makes it impossible to quenching manufacturing thick wall products. PTFE linear expansion coefficient is 10~20 times than the majority of steel, plastic, the linear expansion coefficient of variation with [url=http://www.ptfe-glass.com/product-view-Self_Adhesive_Teflon_Tape-36.html]Self Adhesive Teflon Tape[/url] temperature changes very irregular. In the application of PTFE, if not pay enough attention to the performance, it is easy to cause the loss of.
Heating at 400 ?, cracking speed gradually accelerated decomposition of PTFE, main product is tetrafluoroethylene,hexafluoropropylene and eight fluorine [url=http://www.ptfe-glass.com/product-view-PTFE_Coated_Fiberglass-17.html]PTFE Coated Fiberglass[/url] cyclobutane. At 475 ?, decomposition products of perfluoroisobutylene few poisonous. Note that the heating temperature should not exceed 400 ?, and the laboratory should have good ventilation system, to remove toxic gases.
Although the PTFE ethylene material performance is stable, but its shortcoming is also very obvious. PTFE is the flow of "cold". The material [url=http://www.ptfe-glass.com/product-view-Teflon_Cloth-18.html]Teflon Cloth[/url] in the long time continuous loading plastic deformation (creep), which bring some limits to its application.
12.11.2013 04:32 Offline ptfeglass

 

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