Application of low friction performance of PTFE gasket
PTFE gaskets should not be lubricated due to the friction of some equipment, such as in the case where lubricating grease is dissolved by solvent, or in industries such as paper, pharmaceutical, food, textile, etc., it is necessary to avoid lubricant contamination. It makes the filling of PTFE material the most ideal material for mechanical equipment "target=_blank> mechanical parts without oil lubrication (direct load bearing). This is because the friction coefficient of this material is the lowest among the known solid materials.
Hexagonal wire netting provides long-life duration. It has reinforced lines
equally spaced across the netting. This Fence is ideal for poultry and pet
enclosures, garden fencing, storage bins, decorative supports, soil erosion
prevention and many other home and garden projects. It provides predator proof
protection for domestic poultry and small animals.
Material: Black wire (have to be with other treatments)
PVC/Vinyl coated steel wire
Weaving: Straight Twist, Reverse Twist, Double Twist
For finish: Electro-galvanized wire before weaving
Hot dipped galvanized wire
before weaving (GBW)
Hot dipped galvanized after
weaving (GAW)
Thermal dipped PVC/Vinyl
coated after weaving with black or galvanized wire (mainly in black and green)
PVC/Vinyl coated wire
before weaving (with various colors)
Features of Hexagonal Wire Netting
• Good
ventilation
•
Simple but Solid construction
•
Extremely versatile
•
Easy installation
•
Easily cut to fit
•
Available in various materials and sizes
Standard Sizes of Hexagonal Wire Netting
Mesh
Normal Wire Gauge (BWG)
Inch
mm
3/8"
10
27,26,25,24,23,22,21
1/2"
13
25,24,23,22,21,20
5/8"
16
27,26,25,24,23,22
3/4"
20
25,24,23,22,21,20,19
1"
25
25,24,23,22,21,20,19,18
1-1/4"
32
22,21,20,19,18
1-1/2"
40
22,21,20,19,18,17
2"
50
22,21,20,19,18,17,16,15,14
3"
75
21,20,19,18,17,16,15,14
4"
100
17,16,15,14
PTFE gaskets have outstanding excellent comprehensive properties, high temperature resistance, corrosion resistance, non-stick, self-lubricating, excellent dielectric properties and low friction coefficient. Adding any filler that can withstand the sintering temperature of PTFE in PTFE can greatly improve its mechanical properties.
At the same time, maintain the other excellent properties of the PTFE gasket. Filled varieties include glass fiber, metal, metal oxide, graphite, molybdenum disulfide, carbon fiber, polyimide, EKONOL, etc., wear resistance, limit PV value can be increased by 1000 times. The depolymerization of polytetrafluoroethylene to produce 1 mol of tetrafluoroethylene requires only 171.38 kJ of energy. Therefore, at the time of pyrolysis, the polytetrafluoroethylene is mainly depolymerized into tetrafluoroethylene.
The weight loss rate (%) of the Teflon gasket at 260, 370, and 420 ° C was 1 × 10 - 4.4 × 10 -3 and 9 × 10 - 2 , respectively. It can be seen that polytetrafluoroethylene can be used at 260 ° C for a long time. Due to the highly toxic by-products such as fluorophosgene and perfluoroisobutylene, it is necessary to pay special attention to safety protection and prevent PTFE from contacting open flames.
The specific applications of PTFE gaskets include bearings for chemical equipment, papermaking machinery, agricultural machinery, piston rings, machine tool guides, and guide rings. They are widely used as bridges, tunnels, steel roof trusses, and large-scale civil engineering projects. Chemical pipelines, support slides for storage tanks, and as bridge supports and bridge swivels.
Good chemical resistance of PTFE gasket
PTFE gasket has excellent chemical stability, can be used as stuffing box gasket, pipe thread sealing raw material belt, raw material rope, packing, microporous diaphragm, microporous filter plate, lining device, pipe, membrane Box, liquid level floater, experimental instrument; communication satellite, coaxial transmission of TV transmission line, ultra-high frequency communication, winding of micro motor, control cable of thermal power plant and wire insulation of computer for double water cooling Water pipes, electrolysis cells in thermal power plants. Utilizing the low coefficient of friction of polytetrafluoroethylene, it is not sticky.
At the same time, in order to improve the wear resistance and creep resistance of PTFE gaskets, the manufacture of mechanical parts mostly uses filled PTFE, sealed bearings, piston rings, rollers, and intake heads.
The PTFE gasket has a low dielectric constant and dielectric loss over a wide frequency range, and has high breakdown voltage, volume resistivity, and arc resistance. Polytetrafluoroethylene is produced by radical polymerization of tetrafluoroethylene.
The industrial polymerization is carried out by stirring in the presence of a large amount of water to disperse the heat of reaction and to facilitate temperature control. The polymerization is generally carried out at 40 to 80 ° C under a pressure of 3 to 26 kgf/cm 2 , and an inorganic persulfate or an organic peroxide may be used as an initiator, or a redox initiation system may also be used.
Aramid packing
Scope of application: There are granular fluids and their media, steam, organic solutions, acids, alkalis, etc., which are applied to the sealing of machinery, pumps, valves, pipes, containers, etc. used in fluid conveying equipment.
Features: The filler has excellent lubricity and wear resistance. The most outstanding performance is high strength, high grinding capacity, good chemical resistance, high rebound, low cold flow and easy disassembly. It is especially suitable for dynamic sealing parts containing solid particle media.
Technical Parameters:
Temperature: -100 ° C ~ +300 ° C
Pressure: 35MPa
Chemical resistance: PH value 2-13
Pure PTFE packing oil-containing pure PTFE packing is specially treated by PTFE wire with low friction and suitable for dynamic sealing pump. Therefore, the packing is generally not recommended for use on high line speed pumps.
Oil-containing PTFE packing specifications:
3*3mm--50*50mm; special specifications or various non-standard products can be formulated according to customer requirements.
The main technical parameters of oily PTFE packing:
Pressure 10Mpa
Temperature (Temperature) 260 ° C
Ph range (PH range) 0~14
Linear speed 10 m / s m / s
Expanded graphite packing
The expanded graphite packing is woven by a flexible graphite wire. It has the advantages of good self-lubricity and thermal conductivity, small friction coefficient, strong versatility, good flexibility, high strength and protection for the shaft. According to different requirements, it can be reinforced with carbon fiber, glass fiber and other materials.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
Electro-galvanized wire
Hot dipped galvanized wire
Stainless steel wire
Hexagonal Wire Netting
Hexagonal Wire Netting,Galvanized Hexagonal Wire Netting,Pvc Coated Hexagonal Wire Netting,Black Vinyl Coated Chicken Wire,Hexagonal Wire Mesh
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