Professional Introduction to Acrylic Packing (Acrylic Fiber Sealing Packing)

Acrylic packing is a new type of environmentally friendly sealing material made from modified acrylic fibers through special weaving processes. It combines the sealing performance of traditional packing with modern environmental characteristics.

Core Features

1. Material Composition:

   • Base Material: High-purity acrylic polymer fibers

   • Impregnating Agent: Silicone-based or PTFE composite lubricants

   • Reinforcing Materials: Some models include graphite or mica fillers

2. Performance Parameters:

   • Temperature Range: -40℃ to 200℃ (short-term up to 230℃)

   • Pressure Tolerance: ≤3.5 MPa (rotary) / ≤15 MPa (reciprocating)

   • Linear Speed: ≤12 m/s (in water media)

   • Friction Coefficient: 0.08–0.12 (dynamic)

3. Key Advantages:

• Environmentally friendly and non-toxic; free of asbestos and heavy metals

• Excellent chemical resistance; suitable for pH 2–12

• High fiber strength and good extrusion resistance

• Long-lasting self-lubrication with extended maintenance cycles

Product Series

Model	Applicable Media	Features	Industry Certification
AM-100	Water/Oil	General-purpose	ISO 9001
AM-200	Acid/Alkali Solutions	Enhanced corrosion resistance	CE Certification
AM-300	High-Temperature Steam	Enhanced corrosion resistance	API 622
AM-400	Food/Pharmaceutical	Fully FDA-compliant materials	FDA 21 CFR

Typical Applications

• Petrochemical equipment: Pump and valve seals in refineries

• Power industry: Boiler feed pump shaft seals

• Food processing: Dynamic seals in filling equipment

• Pharmaceutical machinery: Reactor agitator shaft seals

• Environmental engineering: Sewage treatment pump seals

Installation Specifications

1. Pre-treatment Requirements:

   • Surface roughness of shaft/rod: Ra ≤ 0.8 µm

   • Stuffing box cleanliness: Sa2.5 grade

2. Installation Process:

   • Use spiral progressive compression method

   • Preload per ring: 30–50 N/cm

   • Total compression: 18–22%

3. Running-in and Commissioning:

   • Initial leakage: ≤100 ml/min

   • Temperature rise during run-in: ≤35℃

   • Re-check tightness after 24 hours

Maintenance Points

• Routine Inspections:

  • Measure leakage changes monthly

  • Replenish lubricant quarterly (food-grade requires specific grease)

• Replacement Criteria:

  • Continuous leakage >300 ml/min

  • Packing hardness increases by >50%

  • Visible fiber pulverization

Technical Advantages

Compared to traditional grease-impregnated packing, acrylic packing offers:

• Service life extended by 2–3 times

• Friction power consumption reduced by 40%

• Maintenance cycles extended to 12–18 months

• Full compliance with RoHS 2.0 environmental standards

Selection Considerations

1. Media Compatibility:

   • Avoid contact with ketones, esters, and organic solvents

   • Special models required for strongly oxidizing media

2. Operating Conditions:

   • Square cross-section recommended for high-pressure applications

   • Water seal rings required for high-speed rotating equipment

3. Certification Requirements:

   • AM-400 series mandatory for food/pharmaceutical industries

   • REACH compliance proof required for exported equipment

Acrylic packing represents the development direction of modern sealing materials. While maintaining excellent sealing performance, it meets increasingly stringent environmental requirements, making it particularly suitable for industrial scenarios requiring long-term stable operation.

Performance Indicator	AM-100 Standard	AM-200 Corrosion-Resistant	AM-300 High-Temperature	AM-400 Food Grade	Test Standard
Density (g/cm³)	1.15–1.25	1.20–1.30	1.35–1.45	1.10–1.20	ASTM D792
Operating Temp. (°C)	-40–180	-30–200	-20–230	-40–160	ISO 6068
Operating Pressure (MPa)	≤3.0	≤3.5	≤4.0	≤2.5	ISO 6003
Linear Speed (m/s)	≤10	≤8	≤12	≤6	DIN 24960
Friction Coefficient	0.10–0.12	0.08–0.10	0.06–0.08	0.12–0.15	ASTM D1894

Material Composition Analysis

Component	AM-100 Content	AM-200 Content	AM-300 Content	AM-400 Content
Acrylic Fiber	85%	80%	75%	90%
PTFE Impregnant	10%	15%	10%	5%
Graphite Additive	–	–	10%	–
Mica Powder	5%	5%	5%	5%
Heavy Metal Content	≤50 ppm	≤30 ppm	≤100 ppm	≤5 ppm