PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Advantages and Disadvantages of PTFE Seals in Petrochemical Industry
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-12-15
Visits:
The modern petrochemical industry has higher and higher requirements for sealing materials, which require sealing gaskets to be resistant to the erosion of various media, have a wide range of applicable temperatures, and have sufficient mechanical strength at high temperatures.
degree and can maintain dimensional stability. From both corrosion resistance and temperature resistance, PTFE is undoubtedly the most ideal material, in addition to alkali metal complexes, almost no.
Any other medium erosion, wide temperature range, long-term resistance -200 ℃ ~ 200 ℃, gas permeability is also much smaller than asbestos, rubber and other traditional gasket materials. But,
Pure PTFE PTFE material also has its limitations. The most fatal thing is that pure PTFE gaskets have creep problems. After a period of use, due to creep, the thickness of the gasket
Reduced, so that the tightening force of the flange is reduced, resulting in leakage.
In order to provide an effective seal in a variety of harsh environments, gasket materials must be easily compressed, have good elasticity, chemical corrosion resistance, high and low temperature resistance, gas penetration
In the beginning, the method of PTFE coated rubber gasket has been successfully promoted in some occasions. However, due to the poor rubber, in case of organic solvent
The agent is prone to swelling, low mechanical strength, and the outer layer of the PTFE membrane is easy to rupture, resulting in erosion leakage, so people look forward to the development of a new profile.
material, to provide long cycle effective sealing.
As early as the mid-1980s, foreign countries began to study the use of filling modification methods to improve the sealing performance of polytetrafluoroethylene PTFE materials. GARLOCK, an American company, opened in 1990.
A multi-layer composite high-pressure retraction elastic filled PTFE gasket, using inorganic hollow material and pure PTFE three-layer composite to obtain mechanical properties and compression resilience.
Can all very good gasket material.
At present, the commercial success of the brand is mainly GYLON3504,SIGMA500, etc., this kind of gasket is easy to be compressed, only a small bolt tightening force can achieve effective density.
Seal, so it can be used for glass equipment and the required bolt load is low and the sealing requirements are high, can replace the PTFE coated gasket. There are also manufacturers in the domestic imitation
However, there is a big gap between the formulation and processing methods and foreign countries, and the products have poor compression recovery, easy leakage, easy to break, short service life, small range of use, etc.
Foot.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
PTFE, gasket, material, sealing, compression, elastic, method, effective
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