PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Does the specification of PTFE gasket affect performance?
Classification:
Industry dynamics
Author:
Teflon tube little sister
Source:
Teflon tube little sister
Release time:
2010-01-12
Visits:
In recent years, PTFE gaskets have been widely used as sealing materials and filling materials. Teflon gasket, also known as PTFE gasket or Teflon (Teflon) gasket, is made of PTFE rod, tube and plate by mechanical turning or cutting of flat gasket, V-shaped gasket, piston ring, ball valve gasket, etc. In fluid machinery (such as pumps, compressors, mixing kettles, centrifuges, etc.), the most stringent operating conditions of the parts to the PTFE gasket.
Teflon products manufacturers use Teflon gaskets as engineering plastics, which can be made into Teflon tubes, rods, belts, plates, films, etc. Generally used in the performance requirements of relatively high corrosion resistance of pipes, containers and radar, high-frequency communication equipment materials and other fields. PTFE use conditions industry chemical, petrochemical, oil refining, gas, organic synthesis, non-ferrous smelting, iron and steel and high purity products production.
Figure 1 PTFE gasket source: Teflon tube little sister
In general, the PTFE gasket specification is the thickness of the inner diameter and outer diameter, and there are the following processing methods:
1, through the production of PTFE pipe turning into a certain thickness of the gasket, suitable for small size, small batch.
2. It is cut from a certain thickness of PTFE sheet, suitable for large, medium and small sizes and small batches.
3. It is molded by mold, suitable for large, medium and small sizes and large quantities.
However, it can be produced after determining the inner and outer diameter and thickness of PTFE gaskets. However, in some cases, more detailed information of PTFE gaskets needs to be provided, such as the material of PTFE gaskets. The material of PTFE gaskets can be divided into pure PTFE gaskets, enhanced PTFE gaskets, modified PTFE gaskets, etc., as well as understanding of flange forms. For PTFE gaskets that need to be punched, information such as drilling position and hole diameter need to be provided, more use details also need to communicate with manufacturers.
The surface of the PTFE gasket is in the stress state of three-way compression, and the deformation resistance of the material is larger; while the middle part of the PTFE gasket is less affected by the end, and its deformation resistance is also smaller. Under the same preload, the middle part of the PTFE gasket is more likely to produce plastic deformation than the surface. At this time, it is more difficult to establish the initial seal. Therefore, when the thickness of the PTFE gasket reaches a certain value, the sealing performance does not change or even deteriorate. In addition, the thicker the PTFE gasket, the larger the area of permeation leakage and the larger the permeation leakage rate. By increasing the flow resistance of the fluid, the gasket is deformed. The compression of the gasket is reflected in the gasket surface and flange surface, which can form the initial sealing ability. It reflects the change law that the deformation of the gasket material increases with the increase of time and its stress decreases with the increase of time under the action of a certain temperature and load. In this way, the leakage of PTFE gasket may be greatly improved under high temperature conditions.
Fig. 2 specification table of tetrafluoro gasket (part) source: teflon tube little sister
The effect of the thickness of the PTFE gasket on the leakage: under the same pressing load and the same medium pressure, the leakage rate decreases with the increase of the thickness of the PTFE gasket. This is because under the same axial load, the thick PTFE gasket has a larger compression rebound.
Shenzhen Dankai Technology Co., Ltd. (ShenZhen DanKai Technology Co., Ltd.), whose predecessor was the Fluoroplastic Material Factory of Dongguan Dandi Insulation Material Co., Ltd. established in 1998, specializes in the research and development, production and sales of FEP, PFA, PTFE and other fluoroplastic tube rod sheet membrane products and other insulation materials. The company has international standards of senior R & D team and the introduction of foreign fluorine plastic products production line. Some fluoroplastic products through ISO9001, SGS, FDA certification, Huawei, Foxconn, the United States, ZTE, Intel, AirTAC and other domestic and foreign cooperation customers fully affirmed. The company's main products are: ① pipes: Ptfe pipes, Fep pipes, Pfa pipes, Pvdf pipes; ② Heat shrinkable tubes: Ptfe heat shrinkable tubes, Fep heat shrinkable tubes, Pfa heat shrinkable tubes, Pvdf heat shrinkable tubes; ③ Plate rod film: Ptfe plate rod film, Feep plate rod film, Pfa plate rod film, Pvdf plate rod film, etc. PE: PE, special, spiral tube, spring tube, rotary cutting tube, welding rod, tee, straight, gasket, joint, cone rod, flared tube, sealing tube, braided tube, corrugated tube, etc. At the same time can be customized according to customer requirements processing production of various specifications of fluorine plastic products.
Key words:
Previous Page
Previous Page
Dankai Technology
Address: Area B, 4th Floor, Building 1, North Yongfa Science and Technology Park, Yanchuan North, Chaoyang Road, Songgang Town, Bao'an District, Shenzhen, China
Tel: +86-755-29979617 23127719 23127819
E-mail: dkt@szdankai.com
Focus on us
Copyright©2024 All rights reserved of Shenzhen Dankai Technology Co., Ltd.
