Polytetrafluoroethylene (PTFE) Graphite Packing Introduction

      PTFE Graphite Packing is a high-performance sealing material primarily composed of Polytetrafluoroethylene (PTFE) and graphite, manufactured through specialized braiding processes. Some products may include reinforcing components such as fiberglass, copper wire, or stainless steel wire based on specific application requirements to further enhance structural stability.

      In terms of compositional properties, PTFE provides excellent chemical stability and corrosion resistance, enabling it to withstand erosion from most chemical media including acids, alkalis, salts, and organic solvents. The graphite component imparts a low friction coefficient, effectively reducing wear and energy consumption during equipment operation, while significantly enhancing high-temperature resistance – it can withstand temperatures up to 850°C for prolonged use in oxygenated environments, with even better performance in oxygen-free environments. Furthermore, packing structures produced by cross-interlocking, spiral braiding, and other processes combine high strength with flexibility. This allows them to resist stretching and tearing while conforming tightly to the shapes of sealing parts like shafts and stuffing boxes, accommodating different sizes and operating conditions.

Leveraging these comprehensive advantages, PTFE Graphite Packing is widely used in pumps, valves, and reactors within the petrochemical industry; processing and filling equipment in the food and beverage industry; and equipment such as pulp pumps and pipelines in the paper and printing industries. It serves as a reliable dynamic or static sealing component to prevent fluid leakage and ensure stable equipment operation.

Basic Characteristics

Item	Parameter	Test Standard	Characteristics
Material Composition	PTFE Fiber + Graphite Powder (20-30%)	DIN 3750	Self-lubricating / Heat Resistant
Color	Black(Graphite Composite)	Visual Inspection	White (Pure PTFE) customizable
Density	1.8-2.2 g/cm³	ASTM D792	Decreases by 5-8% after lubricant impregnation
Operating Temperature	-200°C ~ +280°C	ASTM D3045	Short-term peak 320°C

Mechanical Properties

Parameter	Standard Value	Reinforced Type	Test Method
Tensile Strength	≥15 MPa	≥22 MPa	ASTM D2256
Compression Rate	25-35%	20-30%	DIN 53853
Recovery Rate	≥45%	≥50%	ISO 1856
Wear Rate (100h)	≤0.1mm	≤0.05mm	ASTM D6078

Sealing Performance

Sealing Performance	Water Sealing	Acid Sealing	Test Conditions
Leakage Rate	≤1×10⁻⁴ mL/min·m	≤5×10⁻⁴ mL/min·m	3MPa / 150°C / 24h
3MPa / 150°C / 24h	2.5 MPa·m/s	3.0 MPa·m/s	Dry Friction Conditions
Applicable Media	Water / Steam / Weak Acid	Strong Acids / Organic Solvents	pH 0-14

Specifications

Parameter	Standard Range	Special  Customization
Cross-section Size	3mm~50mm	1mm~100mm
Braid Structure	Square / Round / Twisted	Multi-layer Composite Braid
Length	5m/roll (±0.1m)	1-100m/roll
Oil Content	5-15% (Optional)	Oil-free (Food Grade)

Certification Standards

Certification Type	Certification Type	Applicable Field
Food Grade	FDA 21 CFR 177.1550	Food / Pharmaceutical
Industrial Safety	ISO 9001	General Industry
Environmental Protection	RoHS 2.0	EU Export
Nuclear Power	RCC-M Standard	Nuclear Power Plants

Application Reference Table

Economic Parameters

Model	Service Life	Replacement Man-hours	Comprehensive Cost (USD/Year)
Standard Type	1.5-2 years	0.5h	120-180
Reinforced Type	3-5 years	0.8h	80-120
Food Grade	2-3 years	1h	200-300

Note: Costs are listed in the original Chinese Yuan (元). Conversion may be needed.

Key Instructions:

1. Installation Points:

   · Shaft surface roughness must be controlled within Ra 0.8-1.6 μm.

   · Cuts of each packing ring should be staggered by more than 120°.

2. Selection Recommendations:

   · Rotating Equipment: Select reinforced type with graphite content ≥20%.

   · Strong Acid Conditions: Recommend using with anti-corrosion coated shaft sleeves.

This product has been successfully applied in:

· High-temperature pump seals in petrochemical industry (280°C / 4MPa).

· CIP systems in pharmaceutical plants (alternating pH 1-14 conditions).

· Cooling water pumps in nuclear power plants (RCC-M nuclear grade certification).