Table of Contents
Reviewed and updated by ICD - Week 29/2026
Quick summary:
- Woven PP fabric is made by drawing polypropylene into thin tapes and weaving them in a cross structure, giving outstanding tensile and tear strength.
- It is the ideal material for industrial packaging (jumbo bags, agricultural and chemical sacks) and the outer shell of high-AAR-level woven PP dunnage bags.
- It resists moisture and chemicals and can be reused, giving both economic and environmental benefits.
- Its cross-weave spreads load across warp and weft, so it resists tearing and puncture far better than single-layer film or kraft.
What is woven PP fabric? Structure and strength
Woven PP fabric is a textile made from thermoplastic polypropylene (PP), woven - not knitted - with PP tapes interlaced tightly in a cross structure. It is a key material for the outer shell of dunnage bags.
How it is made
Production needs precise technology for uniformity and strength:
- Tape extrusion: PP pellets are melted and drawn into thin, flat tapes of even width. The tape quality (thickness, initial tensile strength) decides the final fabric quality.
- Weaving: the tapes are woven warp and weft into a uniform sheet. This cross structure forms a durable matrix that spreads force better than any single-layer film.
- Coating: a thin PE or PP film is often laminated to one or both sides to boost moisture and water resistance, sealing the gaps between the woven tapes.
How it bears load
Its strength comes from the weave and from PP itself. The cross weave distributes tensile or tearing force evenly across the warp and weft rather than concentrating it at one point, giving superior tear and puncture resistance. Polypropylene tape is naturally high in tensile strength, and woven together the fabric can carry several tonnes without breaking.
Why woven PP is preferred for heavy-duty packaging
Load capacity, impact strength and shunting
Thanks to its high tensile strength, woven PP is the main material for jumbo bags (FIBC) rated 500-2,000 kg. In logistics, especially rail, packaging must withstand shunting forces when cars couple. The extreme compression and impact resistance of woven PP make it the only material reaching the high AAR levels for dunnage bags. See structure and types for how it compares with kraft.
Moisture and chemical resistance, reuse
PP resists moisture and chemicals well, protecting goods such as fertilizer, chemicals and grain from damp and corrosion in long storage and transit. Its durability lets bags (jumbo bags or woven PP dunnage bags) be cleaned and reused many times if the structure is intact - a long-term economic benefit.
Key applications in logistics
Jumbo bags (FIBC) and dry bulk
The most common use - holding and shipping bulk materials such as cement, minerals and plastic pellets, keeping the package intact through lifting, lowering and stacking. Also used for rice, sugar and animal feed, where moisture resistance and strength protect the product.
High-AAR woven PP dunnage bag shells
In container logistics, woven PP gives an outer shell far more puncture and tear resistant than multi-ply kraft, easily reaching Level 3-5 - required for very heavy or sharp-edged cargo such as steel coils and machinery. See how to choose a dunnage bag.
Frequently Asked Questions (FAQ)
Why is woven PP stronger than film or kraft?
Its cross weave spreads force across warp and weft instead of concentrating it, so it resists tearing and puncture far better than single-layer film or paper.
What load can woven PP carry?
Jumbo bags are rated 500-2,000 kg, and woven PP dunnage shells reach the highest AAR levels (3-5).
Is woven PP waterproof?
PP resists moisture and chemicals, and a PE/PP coating seals the weave gaps for full water resistance.
Can woven PP be reused?
Yes. If the structure is undamaged, it can be cleaned and reused many times, unlike kraft.
Contact ICD Viet Nam
For woven PP dunnage bags and industrial packaging, contact our team for a quote.
- Northern Vietnam: 0983 797 186 / 090 345 9186 / 090 5859 186
- Southern Vietnam: 098 6784 186
- Email: sales@icdvietnam.com.vn
- Zalo: Chat on Zalo
PP Woven Fabric Specifications for Dunnage Bags
PP woven fabric used in air dunnage bags is engineered to a tighter specification than commodity sack material. The outer shell must resist lateral shear forces during cargo shifting, survive repeated inflation-deflation cycles, and perform in high-humidity sea freight environments - none of which a standard 60 GSM bag fabric is built for. The five properties below define the minimum viable spec for dunnage-grade PP woven.
| Property | Specification | Significance |
|---|---|---|
| Base resin | Polypropylene (PP) | Lightweight, chemical-resistant |
| Weave type | Flat-woven or circular woven | Determines tear resistance direction |
| Weight (GSM) | 80-120 g/m2 for dunnage bags | Balances strength and flexibility |
| Tensile strength | Min. 200 N/5cm (warp and weft) | Determines lateral force capacity |
| Moisture absorption | Less than 0.1% | Performs in humid sea freight |
The 80-120 GSM weight range reflects a practical trade-off. Below 80 GSM, the woven structure thins enough that point-contact abrasion from metal container walls can cause surface fibrillation, eventually weakening the shell before the bag’s rated inflation cycles are exhausted. Above 120 GSM, the added mass raises per-unit cost without a proportional gain in burst resistance - the limiting factor at that point shifts to the PE inner bladder rather than the outer shell. Most Level 2 and Level 3 AAR-certified dunnage bags land at 90-100 GSM as the operational sweet spot.
Frequently Asked Questions
What is PP woven fabric in dunnage bags?
PP woven fabric is the outer shell material of premium dunnage bags. It is made from polypropylene strips woven together to create a strong, moisture-resistant layer that surrounds the inner PE air bladder. The woven structure distributes inflation pressure evenly across the bag surface, preventing stress concentration at any single point. In a two-layer dunnage bag construction, the PP woven shell provides tensile strength and abrasion resistance while the PE bladder provides airtightness - neither layer alone can perform both functions.
Why do some dunnage bags use PP woven instead of paper?
PP woven offers better moisture resistance, higher tensile strength, and longer shelf life than kraft paper. It is preferred for sea freight where humidity is a consistent concern - kraft paper multi-wall bags can absorb moisture during a 30-plus day ocean voyage, softening the shell and reducing burst resistance by up to 40% before the cargo even arrives. PP woven absorbs less than 0.1% moisture by weight regardless of ambient humidity, which is why it is the standard choice for ISO-certified bags used in container shipping. Kraft paper bags remain cost-effective for short-haul domestic rail or road shipments where transit time is under two weeks and humidity exposure is controlled.
What GSM is typical for dunnage bag PP woven fabric?
Most dunnage bags use 80-120 GSM PP woven fabric. Higher GSM means more weight and generally more strength, but also higher cost per bag. 100 GSM is a common balance point for Level 2-3 bags rated at 0.8-1.0 bar working pressure. Lighter 80 GSM shells appear in entry-level Level 1 bags for short domestic runs, while 120 GSM or above is typically reserved for heavy industrial loads where the bag contacts sharp metal edges or concrete surfaces. When comparing bags from different suppliers, always request the GSM certificate alongside the AAR or EUMOS test report - a bag can pass burst testing at 80 GSM but fail much sooner under real abrasion conditions than a 100 GSM equivalent.
