PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Performance and Processing Calculation of Various PTFE Gaskets
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-12-12
Visits:
Modified PTFE gasket, PTFE resin is used to add a certain amount of filler, such as glass fiber, bronze powder, molybdenum disulfide, graphite, carbon fiber, etc., by high-speed mixing
After uniform molding, it is made by high temperature sintering. It has excellent compressibility, recovery and sealing. Teflon gasket unique properties and advanced performance characteristics
out of the tightness and torque retention. In the cold flow and the creep characteristics of the material, it overcomes the shortcomings of traditional PTFE, and at the same time it can better maintain the bolt load than traditional PTFE.
This not only improves the durability of the seal, but also reduces the maintenance of the flange.
The advantages of graphite filled PTFE gasket, low friction coefficient, good compression strength, and improved wear resistance; making its use much more than traditional PTFE, which not only improves the environment but also
Cost savings. Suitable for chemical, petrochemical, hydrocarbon reaction and power plant.
Pure PTFE gasket, the full name of PTFE gasket, also known as PTFE gasket or Teflon gasket abroad, has good characteristics such as corrosion resistance, aging resistance and non-conductive. Teflon
Ethylene pH 0-14 (except for molten alkali metals and fluorine at high temperature and pressure). It can have good mechanical strength between -180 ℃ and 250 ℃. Pressure 5Mpa.
Note: When the temperature is lower than -185 ℃. Teflon gaskets can become brittle. Pure PTFE gasket is a clean sealing product, will not contact with any material
The formation of pollution, can be widely used in food, medicine and other industries.
Figure 1: PTFE gasket Source: Dankai
Expanded PTFE gaskets are truly superior and unique materials. It has excellent properties of creep resistance, cold flow resistance, ultra-low temperature resistance, no pollution, easy installation and replacement. in very
Under a small preload, it can withstand considerable internal pressure even under pressure changes. It is very suitable for rough or worn uneven and fragile glass flanges with alternating temperatures.
Sealed occasions. We can choose Gore, Klinger, Garlock, Sealon and other expanded PTFE plates for customers to produce the required sealing gaskets for customers.
Glass fiber filled PTFE gasket (modified PTFE gasket): glass fiber filled PTFE gasket is also called glass fiber modified PTFE gasket is added with PTFE resin
Add a certain amount of filler, such as glass fiber, bronze powder, molybdenum disulfide, graphite, carbon fiber, etc., after high-speed mixing and molding, and then made by high-temperature sintering. Tools
Excellent compression, recovery and sealing.
Teflon gaskets exhibit unique properties and advanced characteristics for tightness and torque retention. In the cold flow and material creep characteristics, overcome the shortcomings of traditional PTFE,
At the same time, it can better than the traditional PTFE to maintain the bolt load, which not only improves the durability of the seal, but also reduces the maintenance of the flange. Glass fiber filled PTFE gasket advantages:
High wear resistance, resistance to chemical media; making its use greatly exceeded the traditional PTFE, which not only improves the environment but also saves costs. Applicable to chemical, petrochemical, hydrocarbon reverse
and power plants. Especially suitable for food, pulp, paper, pharmaceutical industry, such as the environment does not allow pollution of the sealing occasions.
Figure 2: PTFE gasket Source: Dankai
The calculation process of PTFE gasket pressure is as follows:
(a b)×(a-b)×π/4
After calculating x density x height.
a = diameter of the outer diameter in m; B = diameter of the inner diameter in m
S:p/4×(a b)×(a-b)×d
δ is the unit of thickness: m;
ρ is the unit of density kg/m3
PTFE gasket can generally be divided into three processing methods:
1, the first production of PTFE gasket, and then by machine cutting or manual cutting into a certain size shape. Suitable for a certain thickness small batch of large gaskets, can also be used for small
Bulk Medium Gaskets.
2. First produce PTFE tubes or rods, and then turn them into ring gaskets, which are suitable for medium and small batches of small and medium-sized gaskets.
3, the first production of PTFE gasket mold, and then molding sintering molding, and then re-pressure. Suitable for large quantities of small gaskets, high production efficiency, low cost.
PTFE gasket features, PTFE with its chemical resistance, heat resistance, cold resistance, oil resistance is superior to any plastic now and has the "king of plastics" said, it does not.
Easy to age, do not burn, water absorption is almost zero. Its organization is dense, the molecular structure is non-polar, used as a gasket, the contact surface can be smooth, non-stick to the metal flange
With. In addition to molten alkali metal and fluorine-containing gas erosion, it can resist a variety of acid, alkali, salt, grease solution medium corrosion.
PTFE gaskets include pure PTFE, filled PTFE or expanded PTFE, etc. PTFE gasket, gasket is the choice of suspension polymerization PTFE
Made of grease molding. Compared with other plastics, PTFE has the characteristics of excellent chemical corrosion resistance and temperature resistance. It has been widely used as a sealing material.
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, filling, sealing, traditional, with, chemical resistance, heat resistance, cold resistance, oil resistance, corrosion resistance, characteristics
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