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PCB Technology

PCB Technology - Teflon board performance and application

PCB Technology

PCB Technology - Teflon board performance and application

Teflon board performance and application
2023-01-18
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Author:IPCB

Teflon boards are made of Teflon raw materials through molding or extrusion. According to the different Teflon raw materials and industry claims and main applications, Teflon boards can be divided into PTFE sheets, PFA sheets, FEP sheets, PVDF sheet. In the fluorine industry, PTFE sheets and PVDF sheets are mainly used in huge amounts, while PFA sheets and FEP sheets are relatively small.

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Let me introduce to you the performance and applications of PTFE sheet and PVDF sheets.


1. Performance and application of PTFE sheets: PTFE sheets, also called polytetrafluoroethylene sheets, are made by molding polytetrafluoroethylene resin and can be made into sheets, turned films, and tubes. PTFE board (also called PTFE board, Teflon board, Teflon board) is divided into two types: molding and turning. The molded board is made of polytetrafluoroethylene resin by molding method at normal temperature, and then sintering and cooling. become. PTFE turning plate is made of PTFE resin through pressing, sintering and rotary cutting.


(1) Features: The operating temperature range is very wide (from -180 degrees Celsius to +260 degrees Celsius).

Basically resistant to all chemicals except some fluorides and alkaline metal liquids.

Excellent mechanical properties including aging resistance especially for bending and oscillation applications.

Excellent insulation properties (regardless of frequency and temperature), extremely low water absorption, and a series of unique properties such as self-lubricating and non-stick properties.

Disadvantages: high expansion rate, low mechanical strength, not resistant to wear and creep. However, adding bronze powder can add very high wear resistance.


(2) Application seals/gaskets, ring materials, wear-resistant plates/seats, insulation parts, anti-corrosive industries, mechanical parts, linings, oil and gas, petrochemical industry, chemical industry, instrument and equipment manufacturers, etc.


2. Performance and application of PVDF board: PVDF board is a fairly pure polymer. It does not contain additives such as UV stabilizers, heat stabilizers, softeners, lubricants or flame retardants.


PDF plates can be welded into tanks and equipment with PVDF electrodes. Used to hold various chemical liquids. Particularly suitable for the transfer of pure chemical reagents in pure water systems and the semiconductor industry. Due to the chemical inertness of PVDF, it hardly reacts with any media. High temperature resistance, excellent resistance to chemical corrosion and hydrolysis, outstanding UV resistance and weather resistance. It has high mechanical strength, good rigidity, good creep resistance, good sliding properties and wear resistance, inherently low flammability, and good electrical insulation performance. 2.1 PVDF board features have higher stiffness and pressure-bearing capacity than similar polytetrafluoroethylene, but are slightly less smooth and electrically insulating. It has high strength and toughness under low temperature conditions and can self-extinguish. Its operating temperature is between -60℃ and +150℃. PVDF is stable against chloride, bromide and energy rays. Both ester and ketone solutions can corrode it at high temperatures.


(1) Disadvantages of PVDF board include fluorine fumes when burned, making it difficult to bond.


(2) PVDF board is used in electronic industry fields such as transistors and liquid crystal related devices, chemical equipment fields, various parts of food processing machines, packaging machines, pipes, seals, pump parts, rotating disks, valves, slide rails, etc. Suitable for petrochemical, chemical, metallurgy, food, paper, textile, pipelines, seals, pump parts, rotating discs, valves, stop valves, extraction centrifuges, cogs, pipe connections, slide rails. Component manufacturing for the pharmaceutical and atomic energy industries

PTFE PCB

PTFE PCB

3. Teflon board production method


Teflon is produced by free radical polymerization of tetrafluoroethylene. Industrial polymerization reactions are carried out with stirring in the presence of a large amount of water to disperse the heat of reaction and facilitate temperature control. Polymerization is generally carried out at 40 to 80°C and a pressure of 3 to 26 kgf/cm2. Inorganic persulfate and organic peroxide can be used as initiators, or a redox initiating system can be used. Each mole of tetrafluoroethylene releases heat of 171.38kJ during polymerization. Dispersion polymerization requires the addition of perfluorinated surfactants, such as perfluorooctanoic acid or its salts.


4. What is Teflon board?


Teflon board is suitable for processing various gaskets, seals and various electrical insulating parts used in corrosive media.

The product forms of Teflon board include granular products for molding and extrusion, powdery products for rotational molding and coating, and its semi-finished products include films, plates, rods and pipes.

Teflon plates are suitable for making corrosion-resistant parts, wear-reducing parts, seals, insulation parts and medical device parts, high-temperature wires and cable insulation layers, anti-corrosion equipment, sealing materials, pump valve bushings, and chemical containers.



5. Characteristics of Teflon board


Common features:

Operating temperature: -200 degrees to 260 degrees

Ease of processing: can be flanged

Aging resistance: can be exposed to ozone and sunlight for a long time without aging

Corrosion resistance: able to withstand all strong acids and strong oxidants except molten alkali metals, fluorinated media and temperatures above 300°.

The role of strong reducing agents and various organic solvents

Less commonly used features:

Density: 2.16-2.20g/cm3

Volume resistance>1 × 1018

Surface resistance>2×1013

Arc resistance>165 seconds without leakage

Low water absorption: water absorption<0.1%

Lower friction coefficient: smaller friction coefficient

Surface non-stickiness: Known solid data heads cannot adhere to surfaces

Non-combustible: Will not burn in air, suitable for places with strict fire protection requirements

Non-toxic: non-toxic, odorless, physiologically inert, no harm to people and the environment


6. Purpose of PTFE Teflon board


1. Lining layer

2. Insulation parts

3. Seal/gasket

4. Mechanical parts

5. Anti-corrosive industries

6. Ring material, wear-resistant plate/seat

7. Petroleum and gas, petrochemical industry, chemical industry, instrument and equipment production


Teflon board are mainly used for corrosion-resistant gasket seals, linings, lubricating materials and electrical insulation parts used at various frequencies; membranes are used for capacitor dielectrics, wire insulation, electrical instrument insulation, etc.