Process-Controlled Coating — three dedicated production lines manage exact PVC deposition rates to hold the 400g target weight within tight tolerances across the full roll length.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | PVC Coated Tarpaulin Roll |
| Weight (GSM) | 400g |
| Total Thickness | 0.3mm |
| Base Fabric Denier | 500D-500D |
| Base Material | Polyester |
| Coating Material | PVC, double-sided |
| Water Resistance | Waterproof construction |
| Flame Retardant | Available in flame retardant grades — confirm the grade required for your market |
| Anti-UV | Available with UV stabilisation — confirm test basis for your application |
| Surface Finish | Smooth with leather-like texture |
| Repairability | Hot air weldable |
Application Suitability
| Application | Exposure & Requirement |
|---|---|
| Truck and trailer covers | Constant road vibration, wind flexing, weather exposure, abrasion at contact points |
| Machine and equipment covers | Dust ingress, moisture, UV exposure during outdoor storage, handling wear |
| Wood and lumber covers | Rain penetration, fungal moisture, stack weight compression |
| Awnings and tents | Direct sunlight, wind load, repeated folding and deployment |
| Car covers | UV degradation, surface scratching, water pooling on horizontal panels |
Why GSM Verification Matters More Than the Number on the Quotation
When a 400g specification arrives weighing noticeably lighter, the coating layer has been reduced to cut cost, and the waterproof barrier degrades at the thinnest points first.
A stated GSM only protects the buyer when it is verified per roll before dispatch.
Buyers who have received underweight rolls report seam failures within months and visible sagging under rain load. The coating thickness directly governs how long the PVC maintains adhesion to the polyester base under flexing [NEED_CITE: relationship between coating weight and adhesion durability in coated polyester fabrics]. Without per-roll weight checks at the factory gate, the specification on paper means very little once the fabric is cut and welded into a finished cover.
Base Fabric Denier and Dimensional Stability Under Load
The 500D×500D polyester yarn count gives this PVC coated tarpaulin roll a stable grid that resists stretching when pulled taut across a frame or tied down over a load. Polyester maintains its tensile properties across a wide temperature range, so the fabric does not slacken in heat or become brittle in cold. For awning and tent fabricators, this means the material holds tension predictably after installation without requiring frequent re-tightening.
Coating Method and Waterproof Integrity at Welded Joints
Double-sided PVC coating seals the polyester base on both faces, preventing water from reaching the yarn through either surface. When the material is hot air welded, the PVC on each side of the seam melts and fuses together, creating a continuous barrier [NEED_CITE: hot air welding performance of PVC coated polyester for tarpaulin fabrication]. This matters for truck cover applications where rain driven at speed against the seam can exploit any pinhole or incomplete bond.
What 400g Weight and 0.3mm Thickness Mean for Practical Use
At 400g and 0.3mm total thickness, this fabric sits in the mid-range of the PVC coated tarpaulin roll weight spectrum. The coating weight is sufficient to fully encapsulate the 500D base yarn, which prevents moisture wicking through exposed fibre ends at cut edges. For machine covers and wood stack covers, this weight provides adequate puncture resistance against sharp corners and rough timber edges without the stiffness and handling difficulty of heavier grades. The 0.3mm thickness also allows the material to fold and roll without cracking the coating surface at the fold line.
The Hidden Cost of Accepting Rolls Without Batch Consistency Checks
Colour variation between rolls from the same order becomes visible once installed side by side on a single truck or awning structure, forcing the fabricator to reject and reorder. Coating weight inconsistency across the batch means some panels weld cleanly while others delaminate under the same heat settings, causing rework on the production floor [NEED_CITE: effect of batch coating variation on hot air weld consistency]. These failures surface after cutting and labour have already been invested, making the financial impact far greater than the raw material cost difference.
Why Technical Buyers Source This Material Here
Deep process control over coating weight and adhesion is maintained across three full production lines, meaning the 400g specification holds from the first metre to the last on every roll. A ten-person R&D team develops samples within days when custom widths or treatment levels are required, rather than waiting weeks for a trial batch. Dedicated QA/QC stages inspect coating uniformity and base fabric integrity throughout production, with 100% pre-shipment inspection catching weight or colour deviations before rolls leave the factory. The smooth leather-like surface finish is consistent roll to roll, so fabricators can set their cutting and welding parameters once without adjusting for surface variation.
Documentation & Verification
- Material specification sheet confirming 400g GSM, 500D-500D base denier and double-sided PVC coating method
- UV stabilisation and flame retardant test reports supplied where applicable to the confirmed grade
- Pre-shipment inspection record with per-roll weight verification against stated 400g specification
- Roll packing list with batch identification for traceability across multiple rolls in a single order
- ISO and CE certificates included in shipping documentation
Fabrication, Handling & Storage
- Hot air weld temperature should be set for 0.3mm PVC coating thickness; test weld on offcuts before full production
- Cut edges on the 400g material should be sealed or hemmed to prevent base yarn fraying over time
- Store rolls upright on end cores to avoid flat spots and permanent creasing in the PVC surface
- Unroll and allow the 400g fabric to relax at ambient temperature before cutting to avoid dimensional drift
- Use PVC-compatible cleaners only; solvent-based products may soften the coating and reduce waterproof integrity
- Overlapping seams should allow sufficient width for the 0.3mm coating to fully fuse during hot air welding
Specifying the Right Grade for Your Application
To match this PVC coated tarpaulin roll to your project, share the end-use environment, expected mechanical loads, and any fire safety or UV requirements for your market. Let us know the roll width, colour preference, and annual volume so we can confirm lead time and batch consistency. If you need cut-to-size panels rather than roll stock, provide the finished dimensions and seam reinforcement requirements.
Frequently Asked Questions
Q: How can I verify the actual GSM matches the 400g quoted specification when rolls arrive?
A: We provide a pre-shipment inspection record showing per-roll weight measurements against the stated 400g specification. You can also conduct a simple weight-per-square-metre check on receipt by cutting a known area and weighing it. Any roll falling outside the agreed tolerance is flagged and replaced before it reaches your cutting table.
Q: What test standards support the flame retardant and anti-UV treatment claims?
A: Flame retardant grades are available and must be confirmed against your local fire safety regulations before ordering. UV stabilisation treatment is also available with the test basis matched to your market requirements. Request the specific test report during the sample approval stage so you can verify compliance before committing to a production run.
Q: How does the 500D-500D base fabric affect long-term tensile performance?
A: The 500D polyester yarn in both warp and weft directions provides balanced tensile strength that resists stretching under sustained load. Polyester maintains its properties across temperature swings, so the fabric does not sag in summer heat or become brittle in winter cold. This dimensional stability is critical for awning frames and truck cover tie-downs that rely on constant tension.
Q: How does the double-sided PVC coating affect weld strength at seam points?
A: Double-sided coating means PVC is present on both faces of the seam overlap, allowing the hot air weld to fuse coating material from both layers into a continuous bond. This produces a seam that is as waterproof as the body fabric. Inadequate coating on either side would leave exposed base yarn at the weld line, creating a failure point under flexing.
Q: Is batch-to-batch colour and thickness consistency maintained across multiple roll orders?
A: Production runs are controlled for coating weight and colour match using standardised processes and in-line inspection. A pre-shipment inspection record documents per-roll verification for each order. If you require multiple rolls for a single installation, request batch matching at the inquiry stage so rolls are produced from the same coating batch.
