PU vs PVC vs TPU Coatings: Waterproofing Methods Compared

PU vs PVC vs TPU: Side-by-Side Comparison

The table below is the version we use in internal product reviews. It compares the three chemistries at the level that changes a purchase decision, not at the level of marketing claims. Read it as a starting filter, then use the sections that follow to test a specific fabric against a specific product tier.

The relative cost index is a planning tool from our own quoting work, not a price list. It moves with polymer grade, add-on weight, fabric width, color minimums and order size, so treat it as a way to sanity-check quotes rather than a number to hold a supplier to.

What a Waterproof Coat Material Actually Does in a Jacket Spec

A waterproof coat material is the continuous polymer layer that stops liquid water from passing through the fabric while allowing some water vapor to escape. It sits on the back of the face fabric, or inside a laminated film, and it is only one of three water-management layers in a finished jacket. The face fabric provides abrasion resistance and tear strength. The durable water repellent finish on the face fabric makes rain bead and roll off so the fabric does not wet out. The coating or membrane blocks the water that gets past the surface. Seam tape closes the holes created by needles. When a jacket leaks, buyers often blame the coating when the real fault is an unsealed seam, a wetting-out DWR, or a zipper that channels water.

Three numbers in a specification tell you most of what you need about the coat material. The first is add-on weight in grams per square meter, which indicates how much polymer was applied and therefore how much protection and stiffness you are buying. The second is the hydrostatic head in millimeters, measured under ISO 811 or an equivalent method. The third is the breathability value, usually expressed as moisture vapor transmission rate or as RET. A coating with a high hydrostatic number and no breathability figure is a rain barrier, not a performance fabric. That may be exactly what a kids' raincoat needs, and it is the wrong answer for a ski shell.

Ask also for the polymer type and the application route. "PU coated" can describe a solvent-based direct coating, a water-based direct coating, a transfer coating, or a laminated PU film. Those four routes behave differently in washing, in cold weather and in cost. A supplier who cannot name the route cannot guarantee a repeat order will perform the same way. This is the single most common gap we see in incoming specifications from new brands, and it is easy to close with one extra line in the tech pack.

Coating or Lamination: The Decision That Outranks Chemistry

Before choosing PU, PVC or TPU, decide whether the polymer will be applied as a coating or as a film. A coating is a liquid polymer spread directly onto the fabric and then dried or cured. A lamination bonds a pre-made film to the fabric with adhesive or heat. The two routes create different failure modes, different hand feels and different minimum order realities.

Direct coating is usually the lower-cost route at small volumes because it runs on standard coating lines and does not require a separate film supply. It gives a soft hand at low add-on weights and works well for 2-layer and 2.5-layer constructions. Its risks are pinholes, uneven add-on across the width, and adhesion problems if the fabric surface is not prepared properly. Transfer coating solves some of the pinhole issue by building the film on release paper first, then bonding it to the fabric; it produces a smoother, more uniform surface at a higher cost.

Lamination with a TPU or PU film gives the most predictable performance because the film thickness is controlled before it meets the fabric. It is the standard route for 3-layer performance shells and for any program where the buyer needs a documented breathability figure. The trade-off is cost and supply chain complexity: film comes in fixed widths and minimum roll quantities, so a small color run can leave you with more film than you need.

For a broader view of how face fabrics, membranes and finishes fit together, our waterproof fabrics comparison covers EVA, nylon and polyester alongside the coating families. This article stays on the coating decision itself.

PU Coatings: The Balanced Default, With One Hidden Risk

Polyurethane is the most common waterproof coat material in outerwear because it sits in the middle of every trade-off. It bonds well to nylon and polyester, it can be applied at 15 to 60 g/m2, it accepts pigments and matting agents, and it can be formulated as a microporous structure that lets vapor through while blocking liquid water. At the low end it produces a soft, quiet fabric suitable for a fashion puffer. At the high end, a hydrophilic PU system can reach breathability figures that satisfy performance retail buyers.

The formulation matters more than the name. Solvent-based PU gives a dense, smooth film with strong adhesion and good low-temperature flexibility, but it requires solvent recovery equipment and carries a higher environmental burden. Water-based PU has improved substantially and is now the default for brands with restricted substance lists, though it can be more sensitive to humidity during curing and may need a slightly higher add-on to reach the same hydrostatic result. Neither is automatically better; what matters is that the supplier states which system they run and can repeat it.

The hidden risk with PU is hydrolysis. Polyester-based PU absorbs moisture over time, and in hot, humid storage the polymer chains break down. The symptom is a coating that turns tacky, then chalky, then peels in flakes, often on the inside of a folded jacket that sat in a warehouse through a wet season. This is not a theoretical concern for brands that produce in Asia and store in a humid market. It is why we ask for a hydrolysis aging test on any PU-coated program destined for tropical warehousing, and why we specify a hydrolysis stabilizer in the compound for those orders.

PU also has a practical ceiling on breathability when applied as a simple direct coating. Microporous PU creates pores small enough to block liquid water and large enough to pass vapor, but the pores clog with body oils and detergent residue over time. Hydrophilic PU avoids pores by moving moisture through the polymer itself, which is more durable in washing but usually slower. A 2.5-layer construction with a printed protective pattern on the coating is the usual compromise for lifestyle jackets that need to feel technical without the cost of a 3-layer laminate.

PVC: Cheap, Heavy and Still the Right Answer for Some Programs

Polyvinyl chloride is the oldest and least expensive of the three. It is applied as a plastisol coating or bonded as a film, usually at 100 to 300 g/m2, which makes it heavy and stiff compared with PU or TPU. Its water resistance is excellent and essentially permanent because the film is thick and non-porous. Nothing gets through it. That is also the problem: nothing gets out, so condensation builds up inside the garment unless the design includes vents.

PVC earns its place in kids' rainwear, industrial workwear, promotional jackets, bags and protective covers. These are products where absolute water blocking, easy wipe-down cleaning and low unit cost matter more than breathability or drape. A children's raincoat that sells at a low price point and gets worn for two seasons does not need a 10K breathable membrane. It needs a robust, brightly colored, fully waterproof shell with welded seams and a hood that stays up.

The material's weaknesses show up in cold weather and in regulation. Standard PVC compounds contain plasticizers, usually phthalates, which migrate to the surface over time and can make the film brittle as they leave. In freezing conditions a plasticized PVC film can crack at a fold, which is why cold-flex testing matters for any market with a real winter. Phthalate restrictions are also strict: REACH Annex XVII limits several phthalates in articles placed on the EU market, and CPSIA limits phthalates in children's products in the United States. A supplier who cannot document the plasticizer system and provide current test reports is a compliance risk, not a bargain.

Recyclability is poor in mixed constructions, and the chlorine content complicates end-of-life processing. For brands with published sustainability targets, PVC is usually excluded by policy rather than by performance. If you need the PVC price point with better environmental positioning, the practical alternatives are a heavy PU coating or a recycled polyester face fabric with a TPU film, both of which cost more but avoid the plasticizer and chlorine conversation entirely.

TPU: The Durability Leader and Where the Premium Goes

Thermoplastic polyurethane is the newest of the three in mainstream outerwear and the one that solves most of PU's weaknesses. It contains no plasticizer, so there is no migration and no embrittlement from plasticizer loss. It remains flexible at low temperature when a polyether grade is specified, it resists abrasion well, and it can be heat welded, which makes seam sealing more reliable than taping a coated surface. It is also the easiest of the three to recycle in a mono-material construction because it can be remelted.

The premium is real. TPU film costs more per square meter than a PU coating at equivalent protection, and the lamination process adds a step. For a performance shell, the premium buys a documented breathability figure, better cold flex and a lower risk of field failure. For a fashion puffer sold in a mild climate, it may buy nothing the customer can feel. That is the honest purchasing logic: pay for TPU where the product will be used hard, in cold or wet conditions, or where the brand's warranty exposure is high.

Grade selection inside TPU matters. Polyether-based TPU resists hydrolysis and stays flexible in cold and damp conditions, which suits outerwear. Polyester-based TPU has better oil and abrasion resistance but is more prone to hydrolysis, so it is a better fit for applications with chemical exposure than for a jacket that will sit damp in a car boot. Film thickness is the other lever: 15 to 25 g/m2 films suit lightweight shells and packable jackets, while 30 to 50 g/m2 films suit abrasion-exposed areas and heavier winter products. A supplier quoting "TPU" without a grade family and a film weight has not quoted a specification.

TPU also changes construction. Because the film can be welded, seam sealing can be done with heat and pressure rather than adhesive tape alone, and the bond is stronger and more consistent. That reduces the most common leak path in a waterproof jacket. It does require the factory to control welding temperature and pressure precisely, and to test peel strength on production seams, not only on the sample. We treat seam peel strength as a critical control point on every TPU program.

Durability: The Tests That Predict Field Failure

Coating durability is not one property. It is the sum of adhesion, flex fatigue, abrasion, hydrolysis resistance, cold flex and wash durability. A coating can pass a hydrostatic test on day one and fail in the field three months later because it delaminated at a fold or cracked at minus 12 C. The table below lists the checks we require, what each one catches, and the question to ask the supplier.

A test report is only useful if it names the fabric, the coating route, the add-on weight and the test standard. Reports that list a hydrostatic number without those details are marketing documents. Ask for the report on the production lot, and ask for the wash-conditioned result, because that is the number your customer experiences after a season of use. Our rating guide explains how to read the numbers; this section is about how to challenge them.

Matching the Coating to the Product Tier

Most sourcing errors come from buying more coating than the product needs, or less than the use case demands. The tier framework below is how we steer a brief before any fabric is ordered. It assumes the jacket is the primary product, not an accessory, and that the brand cares about returns and reviews.

Two adjustments are worth making at the brief stage. First, decide whether the coating needs to survive washing or only wiping. A wipe-clean workwear jacket can use a heavier, cheaper coating that would fail a 20-wash test, and that is a legitimate engineering choice. Second, decide whether the jacket will be compressed. A packable shell needs a thin, flexible film because repeated compression concentrates stress on the same fold lines; a parka that hangs in a closet does not.

Process Control on the Coating Line

The same chemistry can produce good and bad fabric depending on how the line is run. Coating weight, cure temperature, line speed, fabric tension and surface preparation all change the result. When we audit a coating partner, we look for documented settings per fabric rather than operator memory. The same audit logic applies at garment level, and our waterproof jacket manufacturer checklist lists the questions we ask before a line is approved. The timeline below shows the sequence we follow from brief to approved bulk fabric.

Sampling typically runs 7 to 14 days, and bulk production 25 to 40 days after approval.

Three inline numbers deserve a place in your QC plan. Add-on weight per roll catches a supplier thinning the coating to save cost. Adhesion after flex catches a curing problem before it becomes a return. Shade continuity across rolls catches the color shift that appears when a coating is re-run at a different line speed. None of these require a laboratory; they require a specification and someone checking against it.

Cost, MOQ and Lead Time Realities

Coating cost is driven by four variables: polymer type, add-on weight, fabric width and color minimum. TPU film at 30 g/m2 costs more than PU at 25 g/m2, and a 150 cm width costs more per meter than a 145 cm width with the same construction. Color is the variable buyers underestimate. A coating line needs a clean run per shade, so a small color order carries a setup cost that a large one spreads across thousands of meters.

Fabric mills commonly set minimums in the range of 1,000 to 3,000 meters per color for a custom coating, depending on the mill and the construction. That number, not the garment MOQ, is often the real constraint for a new brand. The practical route is to choose an existing coated fabric from the mill's stock range for the first season, then move to a custom shade once volume is proven. We regularly build programs this way because it protects cash flow and still delivers a product that looks and performs like a custom development.

At the garment level, our minimum order is 50 pieces per style, which lets a brand test a coated jacket in a real market before committing to a full range. Sampling takes 7 to 14 days. Bulk production takes 25 to 40 days after sample approval, with 30 percent deposit and 70 percent balance. Sample fees run from 50 to 200 US dollars depending on complexity and are deductible against the bulk order. Those terms apply to coated and laminated jackets alike, whether the shell is PU, PVC or TPU.

Compliance for EU and US Buyers

Coating chemistry sits inside several regulatory frameworks, and the paperwork differs by market. For the EU, REACH restricts certain substances in articles, and the restricted substance list your brand publishes will usually be stricter than the legal minimum. OEKO-TEX Standard 100 is the common way to demonstrate that the coated fabric and trims are free from harmful substances at the limit values defined for the product class. For children's products in the United States, CPSIA phthalate limits apply, which is the main reason PVC programs need a compound-level declaration. California Proposition 65 adds a disclosure layer for certain chemicals, and buyers increasingly ask for it in the supplier questionnaire.

Factory-level certification is a separate question from product-level testing. ISO 9001 covers the quality management system. BSCI or an equivalent social audit covers labor conditions. RDS applies to down fill, not to the coating, but it is part of the same compliance pack for a down jacket. OEKO-TEX applies to the materials. A credible supplier should be able to send current certificates with a scope that covers the site producing your order, plus test reports for the specific fabric lot. We keep those documents on file for each program and send them with the shipment.

The RFQ Specification Sheet to Send a Factory

Comparable quotes come from comparable briefs. Include the following fields in the first email, and you will eliminate most of the back-and-forth that delays sampling.

1. Product type and end use, including the climate and season the jacket is built for.
2. Face fabric: fiber, denier or yarn count, weight in g/m2, weave, and whether it is recycled.
3. Coating chemistry and route: PU, PVC or TPU, direct coating, transfer coating or lamination, and target add-on weight.
4. Performance targets: hydrostatic head, breathability, wash cycles, cold-flex temperature.
5. Construction: 2-layer, 2.5-layer or 3-layer, lining type, seam sealing method.
6. Color and color minimum, plus lab dip requirements.
7. Compliance market and required documents: REACH, OEKO-TEX, CPSIA, Prop 65, RDS if down is used.
8. Order quantity per style, per color and per size, with a size breakdown.
9. Target price, target delivery date and destination port.
10. Sampling deadline and the name of the person approving the sample.

If you are still choosing the face fabric, our custom fabric selection guide walks through the fiber and weave decision before the coating decision. If the coating is already fixed and you need a production partner, the next step is a technical review of your tech pack.

Six Specification Mistakes That Cost Buyers Money

• Specifying a chemistry without a route. PU direct coating and PU film lamination are not interchangeable, and the quote difference is real.
• Using hydrostatic head alone as the performance target. A high number with poor adhesion and no cold flex is a field failure waiting for winter.
• Forgetting wash conditioning. The rating that matters is the one after the number of washes your care label promises.
• Treating DWR as waterproofing. The face finish sheds rain; it does not stop water pressure. The coating does that job.
• Ignoring seam sealing in the cost. Taping or welding can add meaningful labor, and it is the difference between a waterproof jacket and a water-resistant one.
• Changing the compound after approval. A supplier substitution to protect a margin can void the test report and the compliance file at the same time.

Frequently Asked Questions