Coloured greaseproof paper is a specialized packaging material composed of wood pulp (typically 60-80% alpha-cellulose content) that has undergone extended refining (30-60 minutes at 40-60°C) to create a dense fiber network with reduced porosity. The coloration is achieved through FDA-compliant food-grade dyes (0.5-3% by weight) that maintain stability at temperatures up to 220°C. The base paper typically has a basis weight of 30-120 g/m², with thickness ranging from 40-150 microns.
Unlike standard greaseproof papers, the colored variants incorporate lightfast pigments that maintain chromatic stability (ΔE ≤ 3.0 after 500 hours of UV exposure per ISO 105-B02) while preserving the material's functional properties.
| Property | Typical Value Range | Test Method |
|---|---|---|
| Grease Resistance | Kit No. ≥ 10 (TAPPI T559) | ASTM D722 |
| Burst Strength | 200-500 kPa | ISO 2758 |
| Tensile Strength (MD) | 40-80 N/15mm | ISO 1924-2 |
| Heat Sealability | 120-180°C range | ASTM F2029 |
| Oil Permeation Time | >24 hours (at 23°C) | ASTM F119 |
| Color Fastness | 4-5 (ISO 105-A02) | AATCC 8 |
The material demonstrates exceptional barrier performance with water vapor transmission rates (WVTR) of 5-15 g/m²/24h (at 38°C, 90% RH per ASTM E96) and oxygen transmission rates (OTR) below 50 cm³/m²/24h (at 23°C, 0% RH per ASTM D3985). The surface energy ranges from 30-40 dynes/cm, contributing to its non-stick characteristics.
With a melting point exceeding 200°C and thermal conductivity of 0.05-0.08 W/(m·K), coloured greaseproof paper maintains dimensional stability (±0.5% shrinkage) across temperature ranges from -20°C to 200°C. The specific heat capacity measures approximately 1.3-1.6 kJ/(kg·K).
Bakery Products: Withstand oven temperatures up to 220°C for 45+ minutes without color migration (tested per EU 10/2011)
Fast Food Wrapping: Oil holdout performance maintains integrity for 6+ hours with 25% fat content foods
Confectionery: Prevents fat bloom in chocolate products during 28-day storage at 18°C
Adhesive Backing: 98% silicone adhesive release efficiency at peel rates of 300 mm/min
Electronic Components: Static decay time < 0.5s (per ANSI/ESD STM11.11) with surface resistivity of 10^9-10^11 ohms/sq
Pharmaceutical Interleaving: Passes USP <87> biological reactivity tests
Crafting: Maintains color vibrancy (ΔE < 2.0) after 12 months indoor display
Floral Wrapping: Tear resistance > 600 mN (Elmendorf method) prevents damage during handling
Art Conservation: pH-neutral variants (7.5-8.5) for archival material interleaving
Temperature: Maintain between 15-25°C (59-77°F) with <5°C/hour fluctuations
Humidity: 45-55% RH to prevent moisture absorption (>3% moisture content affects performance)
Stacking: Maximum pallet height of 1.2m to prevent compression deformation
Light Exposure: Store in UV-filtered lighting (≤50 lux) to maintain color stability
Use clean, powder-free gloves when handling to prevent oil transfer (surface contamination >0.5mg/cm² reduces performance)
Implement first-in-first-out (FIFO) inventory with maximum 12-month shelf life from manufacture date
For printed varieties, allow 72-hour curing period before food contact
Pre-condition rolls at operating environment for 24 hours (±2°C of use temperature)
For heat sealing, maintain dwell time <3 seconds to prevent fiber degradation
When die-cutting, maintain tool clearance of 10-15% of material thickness
Modern coloured greaseproof papers achieve 92-98% biodegradability (per ISO 14855) within 90 days in commercial composting facilities. The material typically contains 20-40% post-consumer recycled content while maintaining barrier properties. Carbon footprint ranges from 1.2-1.8 kg CO₂ equivalent per kg of production (cradle-to-gate assessment per ISO 14040).
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