PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Precautions for the use of PTFE sheet
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-12-29
Visits:
Teflon backing plate is also called PTFE plate, which is a good sealing material. It is suitable for sealing the uneven surface of the flange, and for the flange sealing surface with concave and convex marks or scratches.
There is some compensation. The following are the matters that should be paid attention to during the use of Dankai PTFE plate.
1. PTFE plate has "cold flow". That is, the plastic deformation (creep) of material products under long-term continuous load, which brings certain limits to its application.
system. For example, when PTFE is used as a sealing gasket, the bolts are tightened so tightly that when the specific compression stress is exceeded, the gasket will be compressed due to "cold flow" (creep).
Flat. These shortcomings can be overcome by adding appropriate fillers and improving the structure of the parts.
Low thermal conductivity and poor thermal conductivity, which not only prevents it from being used as a bearing material, but also makes it impossible to quench when manufacturing thick-walled products.
3. The melt viscosity is very high and does not flow at high temperatures. It is above the melting point (327), the melt viscosity reaches 1 010 Pa.s, and it does not flow even when heated to the decomposition temperature, which makes
It can not use the general thermoplastic molding method, but to use the sintering method similar to powder metallurgy.
Figure 1: PTFE sheet Source: Network
4. The linear expansion coefficient of PTFE plate is 10 to 20 times that of steel, which is larger than most plastics, and its linear expansion coefficient changes very irregularly with the change of temperature. should be
When using PTFE, if you don't pay enough attention to this aspect of performance, it is easy to cause losses.
5. When heated above 400, the cracking rate of PTFE is gradually accelerated, and the decomposition products are mainly tetrafluoroethylene, perfluoropropylene and octafluorocyclobutane. Above 475, points
The hydrolysis product has a very small amount of highly toxic perfluoroisobutylene. So pay attention to the heating temperature of PTFE gasket can not exceed 400, and the laboratory should have a good ventilation system, which is conducive to the exhaust
Remove toxic gases.
6. The PTFE plate has outstanding non-stickiness, which limits its industrial application. It is an excellent anti-sticking material, which in turn allows it to bond to the surface of other objects.
Extremely difficult.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
PTFE, backing plate, attention, material, heating, temperature, performance, above, coefficient, good sealing performance, high and low temperature resistance
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