Water and oil resistant paper is a specialized type of paper engineered to repel both aqueous liquids and non-polar substances like oils. This paper achieves its unique properties through advanced manufacturing techniques and specialized coatings:
Water Resistance: Typically achieves a Cobb60 value (water absorption over 60 seconds) of less than 5 g/m², compared to 20-30 g/m² for standard paper. Some premium grades can achieve less than 1 g/m².
Oil Resistance: Demonstrates Kit rating (ASTM D722) of 10-12, indicating complete resistance to oil penetration for 24 hours.
Basis Weight: Ranges from 40-200 gsm (grams per square meter) depending on application requirements.
Tensile Strength: Wet tensile strength maintains 70-90% of dry strength (ISO 3781), compared to 5-15% for untreated paper.
Surface Energy: Modified to 20-30 dynes/cm through fluorochemical treatments, creating both hydrophobic and oleophobic properties.
The performance of water and oil resistant paper is quantified through several standardized tests:
Contact Angle: Measures 110-120° for water and 90-100° for oil (ASTM D5725), demonstrating superior repellency.
Moisture Vapor Transmission Rate (MVTR): Typically 5-15 g/m²/24h (ASTM E96), balancing breathability with liquid resistance.
Thermal Stability: Maintains properties from -20°C to 120°C (EN 60811), suitable for various environments.
Chemical Resistance: Withstands pH 2-12 (ISO 535) without degradation of barrier properties.
Used for grease-resistant fast food wrappers (meeting FDA 21 CFR 176.170), bakery papers, and microwave popcorn bags. The paper's 0.5-2.0% extractables content ensures food safety compliance.
Employed as release liners (with 1-5 N/25mm release force, PSTC-101) for adhesive products and as masking materials in painting operations (withstanding up to 150°C for 1 hour).
Used for sterile packaging (meeting ISO 11607) and disposable medical drapes, demonstrating bacterial filtration efficiency >99% (ASTM F2101).
Applied for maps and navigation charts (retaining 90% strength after 72h water immersion, ISO 3781) and marine documentation.
Used for outdoor signage and menus, maintaining print quality after 500h QUV accelerated weathering (ASTM G154).
Store at 15-25°C with 40-60% relative humidity (ISO 187)
Keep away from direct sunlight (UV exposure >50 MJ/m² may degrade coatings)
Stack flat with <500kg/m² pressure to prevent blocking
For light soiling: Wipe with isopropyl alcohol (<70% concentration)
For oil contamination: Use pH-neutral detergents (pH 6-8) at <40°C
Avoid abrasive cleaners (>3H pencil hardness may scratch surface)
Use powder-free nitrile gloves (ASTM D6319) to prevent contamination
Avoid folding beyond 180° to prevent coating fracture
For critical applications, condition at 23±2°C for 4h before use (ISO 187)
Use inks with surface tension <30 dynes/cm for proper adhesion
Recommended drying: 70-90°C for 20-30 seconds (depends on basis weight)
Post-printing curing may improve durability (60-80°C for 1-2 minutes)
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