PTFE  Gasket/ PTFE Filled  Gasket

Ⅰ、Features

   PTFE envelope gasket is a kind of static seals.It is composed of elastic materials such as compressed asbestos sheet,rubber,ceramics,etc. And PTFE envelope cover.

   PTFE has superior properties against chemical(not affected by all chemicals except molten alkali metal and fluorine at elevated temperature) and temperature(from - 180℃ ~ +250℃）The coefficient of static and dynamic friction of PTFE are every low.PTFE is the best of the “non-stick”material. It has excellent anti weathering and aging characteristics.

Ⅱ、Types and Specifications:

PTFE Envelope Gasket

Note: （Thickness）Gasket slot width

PTFE Flange Gasket

Different standards of different specifications gasket, according to customer drawings for processing

Ⅲ、Applications

PTFE envelope gasket is used to seal pipe flange anti joint of industrial machinery apparatus which is lined with rubber,plastic ceramics graphite etc.

Professional Specification for Red Copper Gaskets

Red copper gaskets are metallic sealing elements manufactured from high-purity red copper (Cu ≥ 99.9%). Leveraging their excellent thermal conductivity, electrical conductivity, and plastic deformation capability, they are the preferred sealing solution for high-temperature and high-pressure conditions. This product uses high-quality T2 red copper as raw material, processed with precision machining and special treatment techniques to ensure reliable sealing performance under various harsh operating conditions.

Core Advantages

1. Exceptional Physical Properties

   · Thermal conductivity up to 398 W/(m·K), 24 times higher than ordinary stainless steel gaskets.

   · Electrical conductivity reaches 100% IACS standard, ensuring excellent electrical connection performance.

   · Strong plastic deformation ability, with a compressibility of 30-50%.

2. Outstanding Condition Adaptability

   · Ultra-wide temperature range: -196℃ ~ +600℃ (Serrated Gaskets)

   · Ultra-high pressure resistance: Up to 45 MPa (Serrated structure)

   · Excellent resistance to hydrogen embrittlement and radiation.

3. Economic & Practical Characteristics

   · Reusable 3-5 times (intermediate annealing treatment required).

   · Easy installation, recommended bolt torque only 20-30 N·m.

   · Multiple surface treatment options available to meet different needs.

Product Series

1. Standard Flat Gaskets

   · Thickness: 0.5-3.0 mm

   · Working Pressure: ≤ 25 MPa

   · Suitable for general medium-low pressure conditions.

2. Serrated Gaskets

   · Tooth Height: 0.1-0.3 mm

   · Working Pressure: ≤ 45 MPa

   · Specifically designed for high-pressure and high-temperature conditions.

3. Clad Gaskets

   · PTFE or Graphite cladding surface.

   · Significantly improved corrosion resistance.

   · Suitable for corrosive media environments.

Typical Applications

· Energy & Power: Steam turbines, boiler system sealing.

· Petrochemical: Hydrogenation reactors, high-pressure heat exchangers.

· Refrigeration Engineering: Low-temperature pipeline connections.

· Vacuum Equipment: High vacuum chamber sealing.

· Electronics & Electrical: High-conductivity connection components.

Quality Assurance

· Raw material complies with GB/T 5231 standard.

· Dimensional accuracy meets ISO 9443 requirements.

· Multiple surface treatment options provided:

  · Mirror Polishing (Ra ≤ 0.4 μm)

  · Silver Plating (Contact resistance < 0.5 mΩ)

  · Oxidation Treatment (Hardness increased by 30%)

Usage Recommendations

1. Clean sealing surfaces before installation to ensure they are free of contaminants.

2. Tighten bolts evenly according to the recommended torque values.

3. Annealing treatment is recommended before use in high-temperature conditions.

4. Do not exceed 5 reuses.

Note: This product is available in standard sizes from DN15 to DN600, and custom sizes are also supported. The latest R&D includes nano-crystalline red copper gaskets (grain size ≤ 1 µm)...

Basic Performance Parameters

Parameter Item	Standard Flat Gasket	Serrated Gasket	Clad Gasket	Test Standard
Material	T2 Red Copper (Cu≥99.9%)	T2 Red Copper + Serrated Surface	T2 Red Copper + PTFE/Graphite Cladding	GB/T 5231
Working Temp. (°C)	-196 ~ +450	-196 ~ +600	-200 ~ +300	ASTM B187
Working Pressure (MPa)	≤ 25	≤ 45	≤ 15	ASME B16.20
Hardness (HB)	35-75	60-95	40-80	ASTM E10
Thickness (mm)	0.5-3.0	1.0-5.0	1.5-4.0	ISO 9443
Surface Roughness Ra(μm)	≤ 1.6	≤ 3.2	≤ 0.8	ISO 4287

Physical Performance Comparison

Performance Indicator	Red Copper Gasket	304 Stainless Steel Gasket	Advantage Comparison
Thermal Conductivity (W/(m·K))	398	16	24x Higher ↑
Electrical Conductivity (%IACS)	100	2.5	40x Higher ↑
Thermal Expansion Coeff. (10⁻⁶/°C)	17	17.3	Comparable
Radiation Resistance	Excellent	Good	Better
Hydrogen Embrittlement Resistance	Excellent	Poor	Significant Advantage

Dimensional Specification Table

Nominal Diameter DN	Inner Dia. (mm)	Outer Dia. (mm)	Standard Thickness (mm)	Serrated Gasket Thickness (mm)
15	16	38	1.0	1.5
50	53	102	1.5	2.5
100	108	1658*	2.0	4.0
600	620	685	3.0	5.0
300	325	370	2.5	4.0

Note: Please verify the Outer Diameter for DN100 (1658 mm seems unusually large compared to adjacent sizes).

Application Condition Reference Table

Condition	Recommended Type	Technical Basis
High-Pressure Steam (≤45MPa)	Serrated Gasket	Serrated structure enhances sealing
Ultra-Low Temperature (-196°C)	Annealed Flat Gasket	Maintains low-temperature toughness
Corrosive Media	PTFE Clad Gasket	Corrosion resistance protection
High Vacuum Environment	Mirror Polished Flat Gasket	Ra ≤ 0.4 μm surface
Electrical Conductivity Requirement	Standard Flat Gasket	100% IACS

Mechanical Performance Parameters

Performance Indicator	Annealed Condition	Hard Condition	Test Standard
Tensile Strength (MPa)	200-250	300-350	ASTM E8
Elongation (%)	≥ 40	≥ 25	ASTM E8
Yield Strength (MPa)	60-80	250-300	ASTM E8
Fatigue Life (Cycles)	50,000	30,000	ASTM E606

Product Types (Summary)

1. Standard Flat Gaskets

   · Thickness: 0.5-3 mm

   · Applicable Pressure: ≤ 25 MPa

2. Serrated Gaskets

   · Sealing Tooth Height: 0.1-0.3 mm

   · Applicable Pressure: ≤ 45 MPa

3. Clad Gaskets

   · PTFE/Graphite Cladding

   · Improved corrosion resistance

Application Fields (Summary)

· Petrochemical: Hydrogenation reactors, high-pressure heat exchangers.

· Power Equipment: Steam turbines, boiler systems.

· Refrigeration Engineering: Low-temperature pipeline connections.

· Vacuum Equipment: High vacuum chamber sealing.

Selection Guide (Summary)

1. Standard Flat Gaskets for conventional conditions.

2. Serrated Gaskets for high-pressure conditions.

3. Clad Gaskets for corrosive environments.

4. Annealing treatment is required for ultra-high vacuum environments.