Products
Products

PTFE coated gasket

Ptfe coated mat

Teflon coated gasket is also called the four fluorine coating non-metallic gaskets, gasket is a generally consists of two parts, cladding layer and insert.Cladding layer of main corrosion effect, usually by ptfe material, insert (stuffing) as the elastic better with or without metal enhancement layer of non-metallic sealing material, usually for asbestos rubber sheet, asbestos rubber sheet, graphite composite board, etc.Ptfe package shoe pads is mainly used in planar and surface of steel pipe flange connection, used nominal pressure PN is 0.6 ~ 5.0 MPa, the working temperature of 0 ~ 150 ℃ of corrosive medium or medium have higher request for cleanliness.The sealing gasket according to different structure of the inner core, v-shaped, u-shaped and L.Petroleum, chemical, pharmaceutical and food industry, some of the containers, pipes, valves, connections, in order to ensure the material cleaning are also often using ptfe gasket to seal.

Does note;Four fluorine cladding gasket due to structure, four fluorine cladding layer thinner so prone to rupture in the process of installation, medium permeability to embed the core material layer caused by erosion.So on important sealing parts often suggested change gaskets or use modified ptfe gaskets or bulk ptfe gasket.

Four fluorine clip package gasket performance characteristics:

1. The combination of the different characteristics of the inner core board material and corrosion resistance of ptfe
2. Low friction coefficient,, is not easy to bond, disassembly easy installation
3. The product is clean, can be used in food, medicine and other sealing parts which must not be polluted
4. Can the good compression resilience

Four fluorine clip package gaskets used industry: chemical, petrochemical, refining, alkali, acid, phosphate fertilizer, pharmaceutical, pesticide, chemical fiber, dye, coking, coal gas, organic synthesis, non-ferrous smelting, steel, atomic energy and high purity products (e.g., ionic membrane electrolysis), viscous material transportation and operation, highly strict health food, beverages and other production departments.

Using equipment, pipelines, valves, pumps, pressure vessels, heat exchanger, condenser, generator, air compressor, exhaust pipe, refrigerator flange joint sealing parts

Four fluorine cladding gasket tag sample
, nominal pressure, nominal diameter of 50 mm 1.0 MPa cutting type teflon gasket:
S-50-1.0 GB/T1304-1304.
, nominal pressure, nominal diameter of 50 mm 1.0 MPa machine processing ptfe gasket:
M-50-1.0 GB/T1304-1304.
, nominal pressure, nominal diameter of 50 mm 1.0 MPa folding bag type teflon gasket:
F-50-1.0 GB/T1304-1992

Four fluorine cladding gasket type structure

1, S type - cutting type

Cutting type cladding gasket is to use teflon tube materials turning into 0.8 ~ 1 mm thick annular slice, from the center of the thickness of the lateral incision, into the core material in the incision.Incision open to from the inner hole is about 1.5 ~ 2 mm.Cutting type of cladding gasket type structure as shown in figure 1-4.


Figure 1-4 S - cutting teflon coated washers
2, M type - machine processing

Machine processing cladding gasket, the coating layer of inner diameter can be consistent with the flange diameter, in order to prevent the fluid in the flange eddy current is produced.After due to machining rectangular cross section, core material into the gap is smaller than type cutting section, so the internal air quantity is small, sealed performance is good.Cutting type of cladding gasket type structure as shown in figure 1-5.



FIG. 1-5 M type machine processing ptfe coated gasket

3, F - bale
Folding bag type of cladding gasket, it is by the thickness of 0.4 ~ 0.4 mm strip of the ptfe film, heat sealing method will after the ends of a thermal bag outside the annular core material is in the shape of U manufacture is simple, is suitable for the large size of the flange seal.Fold the bag type of cladding gasket type structure as shown in figure 1-6.


FIG. 1-6 F type folding bag type teflon coated washers

Teflon coated gasket (PTFE gasket) performance indicators:

project Test conditions indicators
Compression ratio / % * inside * thickness test size (diameter)/mm: 73 * * 3
Preloaded pressure: 35 mpa
Test temperature: 25
20 or more
Resilient rate / % 30 or higher
The stress relaxation rate / % * inside * thickness test size (diameter)/mm: 73 * * 3
Preloaded pressure: 35 mpa
Test temperature: 150 ℃
Test time: 16 h.
45 or less
Allow the leakage rate (cm after/s) * inside * thickness test size (diameter)/mm: 73 * * 3
Preloaded pressure: 35 mpa
Medium pressure: 1.1 times the nominal pressure
Test medium: 99.9% of nitrogen
Test temperature 25 ℃
1x10-³

doesCustomers choose according to different working conditions of use of different material, may be required to have special mining.

Four fluorine clip package gasket technology standards:

Can provide any size of standard and non-standard, including ISO7483, EN 1514-3-9 7, ASME, DIN, JIS, GB and other special requirements of products.

Domestic relevant standards:

GB/T 13404-2008 | pipe flange with teflon coating gaskets
HG/T 20628-2009 | with teflon coated steel pipe flange gasket series) (Class)
HG/T 20607-2009 | with teflon coated steel pipe flange gasket (PN series)
SH, 3402-1996 | pipe flange with teflon coated gaskets

The actual application condition is complex, the above parameters are for reference only do not make any guarantee is requested.

Copyright © 2014 Zhenghai sealing

National toll free hotline:+86-577-86890707

×