Coating Weight Control — Every roll of 900GSM PVC coated tarpaulin undergoes in-process weight verification to ensure the material delivered matches the specification approved at sampling.
Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | PVC Coated Tarpaulin |
| Weight | 900GSM |
| Base Fabric Denier | 200D×300D / 500D×500D / 840D×840D / 1000D×1000D |
| Coating Material | PVC |
| Coating Method | Knife Coated |
| Surface Finish | Glossy or matte |
| Color Options | Blue, yellow, black, green, white, custom |
| Temperature Range | -15°C to 70°C |
| Waterproof | Yes |
| UV Treatment | Available — confirm the grade required for your market |
| Flame Retardant | FR treated — confirm the grade required for your market |
| Anti-Fungal | Anti-fungal treated — confirm the standard required for your market |
| Standards | ISO, CE |
Application Suitability
| Application | Exposure & Requirement |
|---|---|
| Lorry side curtains | Constant flexing at load points, road abrasion, wind load at highway speed |
| Truck and trailer covers | Full weather exposure, tie-down tension, repeated folding and unfolding |
| Heavy-duty transport covering | Puncture risk from cargo edges, UV and rain exposure during transit |
| Outdoor cargo protection | Extended weather exposure, temperature fluctuation, handling abrasion |
Why Quoted GSM Does Not Guarantee Delivered Fabric Weight
Verified coating weight at every production stage is the only way to ensure the PVC coated tarpaulin you receive matches what was agreed on the quotation.
Material arriving lighter than the stated specification is a recurring problem for technical buyers sourcing coated fabric for transport applications. Rolls that measure below the agreed weight often show reduced tensile performance, and the shortfall is rarely detected until the fabric is already cut and welded into curtains. The discrepancy typically originates from inconsistent coating application during the production run [NEED_CITE: tensile and tear test methods for coated fabrics per ISO 1421].
Base Fabric Denier and Its Role in Curtain Performance
The base fabric is the structural skeleton of any PVC coated tarpaulin. Denier selection directly determines how the material behaves under the tension and flex cycles experienced by lorry side curtains in daily operation. Lower denier constructions such as 200D×300D produce a lighter, more pliable fabric suited to applications where drape and handling ease take priority. Higher denier options including 1000D×1000D deliver greater resistance to tear propagation, which is critical when curtain panels flex repeatedly against load edges during transit.
Coating Adhesion and Weld Line Integrity
The bond between the PVC coating and the base fabric determines whether a welded seam holds or peels apart under load. Knife coating deposits a controlled layer of PVC onto the woven base, and the adhesion strength between these two layers dictates how the material performs at every welded joint. When adhesion is weak, seams separate before the fabric body fails, and the failure typically appears at the flex point where the trailer body articulates most. Consistent 900GSM PVC coated tarpaulin with strong coating-to-fabric adhesion ensures the weld line survives the same service life as the panel itself.
How Construction Parameters Translate to Real-World Behaviour
The relationship between base fabric density, coating weight and finished GSM is not straightforward. A 900GSM construction achieves its total weight through the combined contribution of the woven polyester base and the applied PVC coating layers. The knife coating method allows precise control over coating thickness, which directly influences both surface durability and the heat-sealing characteristics needed for curtain fabrication [NEED_CITE: coating adhesion and weld behaviour in PVC coated fabrics per ISO 1421]. Surface finish selection between glossy and matte affects how the material interacts with dirt and cleaning agents over time. The operating temperature range of -15°C to 70°C defines the boundary within which the PVC remains flexible without becoming brittle in cold conditions or excessively soft in high heat. Denier choice across the available range from 200D×300D through to 1000D×1000D allows specifiers to match tear resistance to the mechanical demands of each curtain application.
What Happens When Roll Consistency Is Not Verified Before Dispatch
Colour variation between rolls in the same order becomes visible the moment two panels are installed side by side on a trailer. Weld failures at flex points appear early when coating adhesion varies from one section of the roll to another, and the damage is usually discovered after the curtain has been fabricated and fitted. Flame retardant treatment without supporting test documentation can cause a curtain to fail site compliance inspection, resulting in the entire installation being rejected [NEED_CITE: fire classification standards for transport and industrial fabrics]. These are the consequences that make pre-shipment verification essential rather than optional.
Why Technical Buyers Source This Fabric Here
Three full production lines with 36 sets of professional equipment provide the capacity to fulfil bulk roll orders while maintaining consistent coating weight across every metre produced. The 10-person R&D team handles material selection, sample development and custom colour matching, ensuring each order is built to the exact specification confirmed at the sampling stage. Dedicated QA/QC at every production stage with full inspection before shipment catches weight deviations, colour drift and adhesion faults before the material leaves the facility. Samples for custom width, colour or treatment requirements are developed within days, allowing specifiers to approve the material before committing to production volumes.
Documentation & Verification
- Material specification sheet stating exact GSM, base fabric denier and coating type for this 900GSM construction
- UV and flame retardant test reports provided where treatments are specified and confirmed at order stage
- Pre-shipment inspection record confirming weight and colour consistency across every roll in the order
- Roll packing list with linear meter count and weight per roll for warehouse receiving and inventory control
- ISO and CE certificates included with each shipment as required for customs and project compliance
Fabrication, Handling & Storage
- Set heat sealing temperature and dwell time to match the 900GSM coating thickness for consistent weld penetration
- Reinforce eyelet and hem areas to distribute tie-down load across the 900GSM coated construction
- Store rolls horizontally on racking to prevent permanent crease marks in the knife coated PVC surface
- Allow rolls to acclimatise to workshop temperature before unrolling to avoid cracking in cold PVC coating
- Use non-abrasive cleaners compatible with glossy or matte PVC finish to preserve surface appearance
Requesting a Specification Match
Provide the operating conditions your curtains face — highway speed, load type, and the climate range your fleet covers. Confirm whether your market requires a specific flame retardant grade or UV treatment standard so we can match the test documentation to your compliance needs. Indicate the roll width, colour reference and estimated annual volume so the quotation reflects your actual production requirements.
Frequently Asked Questions
Q: How is the 900GSM weight verified before the rolls are shipped?
A: Each roll undergoes weight sampling during and after the coating process. The total fabric weight is measured against the stated 900GSM specification and recorded in the pre-shipment inspection document. This record travels with your order so you can cross-check on arrival.
Q: Which base fabric denier should I specify for highway-speed lorry curtains?
A: Higher denier constructions such as 840D×840D or 1000D×1000D offer greater tear propagation resistance, which is important for curtain panels exposed to sustained wind load and flex fatigue. Lower denier options may suit lighter-duty or static cover applications where maximum drape is needed.
Q: What test documentation supports the flame retardant and UV claims?
A: Where flame retardant or UV treatment is specified at order stage, we supply the corresponding test report for the grade applied. Confirm the standard your market requires so we can match the treatment and documentation to your project specification.
Q: Can colour be matched across repeat roll orders placed months apart?
A: Colour reference codes are recorded for every production run. On repeat orders, the stored reference is used to control pigment formulation, and batch-to-batch consistency is verified during the pre-shipment inspection before dispatch.
Q: What welding guidelines apply to this 900GSM knife coated construction?
A: Heat sealing parameters should be adjusted to the 900GSM coating thickness to ensure full weld penetration without burning through the PVC layer. We recommend testing weld samples from each production batch to confirm seam strength matches the fabric body performance.
