Reference date: May 2026 | Based on industry standards for industrial packaging materials
Overview
Woven polypropylene (PP) and polyethylene (PE) fabrics are used for wrapping timber and steel products during storage and transportation. Material specifications affect moisture protection, puncture resistance, and UV durability. This document summarizes technical specifications and selection criteria for industrial packaging fabrics.
1. Application Requirements
Timber and steel products have different protection requirements during storage and transit:
Timber Protection
Prevents moisture ingress that can cause mold growth, warping, and discoloration during yard storage or maritime transport.
Steel Protection
Prevents surface corrosion (rust) caused by moisture and humidity. May require VCI (Vapor Corrosion Inhibitor) compatibility for sensitive metal components.
2. Technical Specifications by Application
The following specifications are commonly referenced for timber and steel packaging fabrics:
| Property | Timber Packaging | Steel Packaging |
|---|---|---|
| Typical GSM range | 80 – 120 g/m² | 120 – 200 g/m² |
| Tensile strength | 600 – 1,000 N/5cm | 1,000 – 1,800 N/5cm |
| Lamination type | Single-side or double-side PE | Double-side PE (waterproof) |
| Moisture barrier | Moderate (standard lamination) | High (low MVTR required) |
| UV resistance | Yes (outdoor storage typical) | Yes (optional) |
| Special features | Tear resistance, UV stabilization | VCI compatibility, abrasion resistance |
3. Moisture Vapor Transmission Rate (MVTR)
MVTR measures the rate at which water vapor passes through a fabric. For steel packaging, low MVTR is critical to prevent humidity-driven corrosion. MVTR is typically measured using ASTM E96 or ISO 2528 methods.
Typical MVTR values for laminated woven fabrics:
- Single-side lamination: 5 – 15 g/m²/24h
- Double-side lamination: 1 – 5 g/m²/24h
- High-barrier double lamination: < 1 g/m²/24h (for sensitive steel applications)
Buyers should request MVTR test reports when specifying steel packaging applications.
4. UV Stabilization for Outdoor Storage
Timber and steel products are often stored in outdoor yards. UV stabilization extends fabric service life under direct sunlight exposure. Carbon black (2–3% by weight) or HALS additives are used during tape extrusion.
UV resistance is measured per ASTM D4355. For outdoor storage applications, ≥ 70% tensile retention after 500 hours is a common specification. Expected service life ranges from 6–12 months depending on UV intensity and fabric GSM.
5. Puncture and Tear Resistance
Steel products with sharp edges require higher puncture resistance. Test methods:
- Puncture resistance: ASTM D6241 (CBR puncture test) or ASTM D4833
- Tear resistance: ASTM D4533 (trapezoid tear test)
Typical puncture resistance for steel packaging fabrics: ≥ 200 N per ASTM D4833. Higher GSM fabrics provide greater puncture resistance.
6. Supplier Verification
When sourcing industrial packaging fabrics, the following verification points are recommended:
- ISO 9001 certification: Verify scope indicates "Manufacturing" of woven fabrics (current version: ISO 9001:2015).
- Vertical integration: Confirm the supplier performs tape extrusion, weaving, and lamination in-house for quality consistency.
- Test documentation: Request Mill Test Reports (MTRs) with batch-specific test data.
- Sample verification: Request physical samples to verify GSM, lamination adhesion, and weave consistency.
7. Information to Prepare Before Ordering
To receive an accurate quotation, the following information is typically requested:
- Application: timber packaging, steel packaging, or general industrial
- Required GSM and dimensions (roll width, roll length)
- Lamination: single-side or double-side
- UV stabilization requirement (expected outdoor exposure duration)
- Special requirements: VCI compatibility, custom printing, specific color
- Estimated quantity (rolls, square meters, or containers)
- Destination port and preferred trade term
References
- ASTM D4833. Standard Test Method for Index Puncture Resistance of Geotextiles. ASTM International.
- ASTM D4533. Standard Test Method for Trapezoid Tearing Strength of Geotextiles. ASTM International.
- ASTM D4355. Standard Test Method for Deterioration of Geotextiles by Exposure to Light, Moisture and Heat. ASTM International.
- ASTM E96. Standard Test Methods for Water Vapor Transmission of Materials. ASTM International.
- ISO 9001:2015. Quality management systems — Requirements. International Organization for Standardization.
Article ID: IND-PKG-001 | Last updated: May 2026