Buoyancy tubes
Balance mass and packed volume with tear behavior, airtightness and seam reliability. Confirm which face needs TPU at every tube-to-tube and tube-to-floor joint.
For packraft brands & boat fabricators
TPU Packraft Fabric
Build the right weight
into every panel.
Source TPU coated nylon for packraft tubes, floors, inflatable seats and welded reinforcement patches. DERFLEX supplies coated and laminated technical textiles with project-specific base fabric, coating sides, color, surface and roll format.
Start with your packraft design and target carrying weight. Compare the tube and floor materials separately, then validate the coating bond, joining process and air retention on a representative chamber before committing to bulk fabric.
01 / A direct answer
What is packraft fabric?
Packraft fabric is a reinforced textile used to build a portable inflatable boat. A common construction is woven nylon coated or laminated with thermoplastic polyurethane (TPU): the textile carries load, while the TPU forms the sealing and heat-weldable surface.
A waterproof fabric is not automatically suitable for an air-holding tube. Air permeability, coating adhesion, cooled-seam strength and the valve interface all need evaluation. Packraft material belongs within the wider TPU inflatable fabric range, but its carrying weight and repeated packing requirements deserve a separate specification.
Specify three things together: the textile reinforcement, the TPU layer and the seam layout. A denier label describes yarn size; it does not establish finished fabric weight, tear strength or a safe boat pressure.
02 / Panel-by-panel planning
A light tube. A tougher floor.
A compatible patch system.
The right construction can change across a single packraft. Assign the weight budget and likely failure mode to each part before selecting the rolls.
Floor & contact areas
Prioritize abrasion and puncture resistance at rocks, sand and landing zones. A heavier floor or targeted wear layer may be preferable to adding weight across all tube panels.
Seats & internal baffles
Use a separate weight and flex target. The baffle joint determines where compatible TPU welding faces must meet; the tube material need not be the seat material.
Valves, tie-downs & repair patches
Specify the patch-to-tube bond and attachment geometry. Test patches with the selected tube fabric, including wet conditioning and repeated folding where relevant.
03 / Construction choices
210D or 420D packraft fabric?
210D nylon is a common starting point for weight-sensitive tubes; 420D constructions are evaluated where added durability is worth more mass or bulk. Floor fabrics often use a different construction, including 420D or 840D nylon. These are industry reference directions, not fixed DERFLEX stock grades or performance ratings.
| Packraft program | Tube direction to evaluate | Floor / wear strategy | Approval priority |
|---|---|---|---|
| Hike-in / weight-sensitive | Lightweight nylon/TPU, with 210D-class constructions as a starting comparison. | Separate floor weight budget; avoid carrying unnecessary coating mass in low-wear areas. | Actual GSM, packed volume, coating bond and representative chamber retention. |
| Mixed trekking & river use | Compare 210D and 420D-class samples in the intended seam design. | Increase durability at the floor, bow and other identified contact zones. | Wet-conditioned tear behavior, floor puncture testing and cooled-seam strength. |
| Frequent rock contact / rental | Evaluate higher-strength constructions against a defined service and repair plan. | More durable bottom panel; compatible replaceable wear or reinforcement patches where designed. | Abrasion failure mode, coating damage, repeated flexing and repair compatibility. |
| Inflatable seat / accessory chamber | A dedicated flexible material with the coating orientation needed by the baffles. | Usually a separate component specification rather than a copy of the hull construction. | Baffle adhesion, valve seal, fold durability and component air retention. |
Denier is yarn mass per unit length; GSM is the mass of the finished fabric per square metre. A 420D fabric is not automatically twice as strong as a 210D fabric. Compare the weave, TPU build, test method and measured results together.
Keep craft categories separate. A lightweight packraft tube and a larger inflatable boat can have different reinforcement and fabrication needs. Use the inflatable boat fabric guide when the project extends beyond portable packrafts.
04 / Coating orientation
Single-sided vs double-sided TPU
Choose the coating sides from the assembly drawing. A second TPU face can enable more joining options, but the added polymer changes weight, stiffness and textile behavior; it is not an automatic durability upgrade.
One TPU face
Reduce coating mass where the joint allows it
A single-sided construction can suit selected lightweight tube designs. Seam tapes, overlaps and patches must bring compatible TPU faces into contact.
- Map coating orientation on left/right mirrored panels before nesting.
- Decide whether bare textile faces the water or the chamber interior.
- Evaluate wet handling and repair access in the chosen orientation.
Two TPU faces
Provide sealing surfaces on both sides
Double-sided material can support floor joints, internal structures and patch placement when both faces must be weldable.
- Confirm each face's TPU grade, surface and thickness.
- Measure coated-fabric tear and flex behavior rather than assuming an improvement.
- Include both faces in blocking, welding and patch-compatibility trials.
Can ordinary PU coated nylon be heat sealed?
Do not assume so. “PU coated” can describe a coating that does not soften and fuse like the selected thermoplastic TPU. Ask for a heat-sealable construction and verify the joint; a waterproof tent fabric specification does not establish packraft suitability.
Coated or laminated: what matters at the seam?
Check polymer chemistry, adhesion and sealing faces rather than choosing from the process name alone. The TPU laminated textile options provide another construction route; the packraft sample still needs the same assembly validation.
05 / A purchasing specification
What to put on the packraft fabric RFQ
DERFLEX's TPU range covers nylon and polyester reinforcement, coating and lamination, and project-specific finishes. Confirm the exact nylon packraft grade, usable width and performance targets with DERFLEX; generic range figures should not become an approved raft specification.
| Item | What the buyer should define | What to confirm before bulk supply |
|---|---|---|
| Textile reinforcement | Nylon type, denier, weave and panel use; submit a benchmark sample if available. | Actual substrate construction and warp/weft mechanical results. |
| TPU chemistry | Polyether or polyester TPU direction; wet exposure, storage and temperature conditions. | Selected grade and aging evidence appropriate to the service environment. |
| Coating structure | One or two functional TPU faces, orientation and any face-specific finish. | Coating / film build, bond quality and compatible welding surfaces. |
| Finished GSM & thickness | Separate targets for tubes, floor, seats and patches. | Measured values and agreed tolerances for the approved grade. |
| Color & surface | Color reference, matte/gloss preference and skin-contact or grip requirements where applicable. | Approved shade, surface consistency and effect on joining or patching. |
| Usable width & roll format | Panel nesting width, roll length, winding preference, identification and packing. | Usable width excluding unusable edges, splice policy and roll traceability. |
| Fabrication route | RF/HF, hot-air or heat-sealing equipment; seam and fitting drawings. | A verified process window for that grade, tool and joint geometry. |
| Commercial requirements | Trial quantity, bulk demand, reorder plan and delivery destination. | Grade-specific MOQ, sample availability, price basis and production timing. |
Is polyether TPU required for packrafts?
It is a useful candidate when prolonged wet exposure and hydrolysis resistance are priorities. Polyester TPU can also be evaluated for a defined application, but formulation, conditioning and retained properties matter. TPU chemistry and textile chemistry are separate: polyester TPU can be applied to a nylon base.
Does TPU alone establish UV or cold resistance?
No. Ask for results on the selected composite, including color, coating bond and seam behavior after relevant conditioning. Define temperature and exposure conditions in the test plan; do not turn a broad polymer-family claim into a finished packraft guarantee.
06 / Fabric weight planner
See what a GSM change adds to the boat
Multiply each panel group's cut area by its finished fabric GSM. Keep tube and floor areas separate so you can place additional material where it is useful.
Tube + floor fabric only
Tubes: 0.924 kg · Floor: 0.588 kg
Formula: fabric mass (kg) = [tube area × tube GSM + floor area × floor GSM] ÷ 1,000. Example inputs are illustrative, not offered DERFLEX specifications. Include seam allowances in cut-panel areas; this estimate excludes other panels, valves, tapes, straps, adhesives and accessories.
Material mass and order quantity are different. A 30 GSM increase over 4.2 m² of tube panels adds 126 g of fabric. Cutting waste changes purchased roll length, not finished boat mass. For single-sided fabric, coating orientation can restrict nesting; confirm the usable roll width against the actual pattern.
07 / Sample approval
Test the seam, the chamber
and the repair interface.
A practical approval plan compares failure modes, not just a single pass/fail claim. The checks below are buyer-requested validation items; the method, conditions and acceptance limits should be agreed for the selected packraft.
1. Establish a welding window
Trial a range of machine settings with the actual tool, pressure, dwell or travel speed and overlap. Inspect seams after cooling. Record: machine settings, face orientation, joint dimensions, peel/seam behavior and whether failure occurs in the textile, TPU bond or weld.
2. Separate leakage from cooling
Include valves and patches in a representative chamber. Stabilize temperature before logging pressure and note ambient conditions: cooling can reduce pressure without a leak. Record: chamber geometry, initial pressure, stabilization time, test duration, temperature and leak locations.
3. Compare fabric and floor damage
Evaluate warp/weft tensile and tear behavior, coating adhesion, abrasion and a relevant puncture method. Repeat selected checks after wet or aging conditioning. Record: specimen size, method, conditioning, direction, units and retained performance.
4. Reproduce packing and field repair
Inflate, deflate and fold representative samples, including seams and valve patches. Examine blocking, fold marks and barrier damage. Trial the chosen repair material and joining route. Record: cycles, packing conditions, visible changes and air retention after the sequence.
Working pressure is a craft-level decision. It depends on tube geometry, seam design, fittings, reinforcement and operating conditions. A roll of TPU inflatable fabric has no universal safe PSI value. The finished-boat manufacturer must validate its design and operating limits.
Agree the project-specific inspection points with DERFLEX and review its published quality-control workflow alongside the approved sample and written purchasing specification.
08 / Material references
Look closely at the textile and coating
Original DERFLEX material photographs show surface and construction references. They do not establish a packraft grade, denier, thickness or pressure rating; request the exact proposed sample for your design.
09 / From design to quotation
Send the panel requirements.
Get a useful fabric proposal.
For an OEM packraft fabric quote, send a drawing, a current material sample or a panel-by-panel specification. Identify the tube, floor and accessory requirements instead of asking for one generic “raft fabric.”
Sample availability, MOQ, custom development, bulk price and lead time are confirmed for the proposed grade and order plan. Include the destination and trial quantity so commercial comparisons use the same basis.
- Craft & use: packraft type, intended terrain, tube layout and target carrying weight.
- Panel requirements: tube/floor/seat areas, benchmark denier, GSM and coating sides.
- Assembly details: drawings for seams, valves, tie-down patches, baffles and repair material.
- Fabrication equipment: RF/HF, hot-air or heat-sealing route, tools and current process constraints.
- Service conditions: wet exposure, storage, temperature, abrasion and required validation documents.
- Supply plan: usable width, color reference, sample/trial quantity, bulk forecast, roll packing and destination.
10 / DERFLEX manufacturing support
Specify a repeatable roll construction
DERFLEX's published TPU offering includes textile reinforcement choices, coating or lamination and OEM customization. For packraft manufacturers, the practical value is an agreed material construction that can be connected to your cutting, welding and incoming inspection process.
Material matching
Discuss nylon reinforcement, TPU chemistry, functional coating faces, total weight and finish against the tube and floor drawings.
OEM roll planning
Align usable width, color, roll format and packing with pattern nesting and handling at your production facility.
Sample-to-bulk definition
Use the approved sample and agreed tolerances to define repeat supply. Specify which inspection results and identification records must accompany orders.
Review the TPU coated fabric manufacturing options and ask DERFLEX to confirm the proposed packraft construction before freezing your purchasing standard.
11 / Buyer questions
TPU packraft fabric FAQ
What fabric is used for packrafts?
TPU coated or laminated nylon is a common packraft construction. The nylon provides reinforcement and the TPU supplies a sealing and heat-weldable face. Tubes, floors, seats and attachment patches can use different materials; each must be matched to the assembly and validated in the finished component.
Is 210D or 420D nylon better for packraft tubes?
210D constructions are often considered where carrying weight and packed size are priorities. 420D constructions can be evaluated when added durability is worth additional mass or bulk. Denier alone cannot rank the fabrics: compare finished GSM, weave, coating adhesion, tear results and seam performance on actual samples.
Is double-sided TPU always better than single-sided TPU?
No. Double-sided TPU provides functional sealing faces on both sides, which can help with floor joints, patches or baffles. It also changes weight, stiffness and tear behavior. Choose coating sides from the joint layout and compare tested constructions; a second coating is not automatically a stronger or lighter fabric.
Can ordinary PU coated nylon be used as heat-sealable packraft fabric?
Do not assume that it can. A PU coating may not be thermoplastic or suitable for the required joining method. Request a heat-sealable TPU construction and trial the coating faces, cooled joint and chamber air retention. A waterproof claim alone is insufficient for an inflatable tube.
Is polyether TPU necessary for packraft fabric?
Polyether TPU is a useful candidate when prolonged wet exposure and hydrolysis resistance are priorities. The final choice depends on the formulation, coating bond and application. Specify the wet and temperature conditions, and compare retained fabric and seam properties after conditioning rather than relying only on the TPU family name.
What pressure can TPU packraft fabric hold?
There is no universal safe pressure for TPU packraft fabric. Tube geometry, reinforcement, seams, valves, patches and temperature affect the assembled craft. The boat manufacturer must establish operating limits through design validation and representative chamber and finished-product testing.
Start with the tube, floor and weld requirements.
Share your drawing or benchmark sample with DERFLEX to discuss packraft fabric construction, sample evaluation and OEM roll supply.