[{"data":1,"prerenderedAt":285},["ShallowReactive",2],{"i-lucide:chevron-down":3,"i-lucide:arrow-right":8,"i-lucide:menu":10,"i-lucide:map-pin":12,"i-lucide:arrow-up-right":14,"i-lucide:message-circle":16,"i-lucide:mail":18,"i-lucide:x":20,"blog-\u002Fblog\u002Fpu-vs-pvc-vs-tpu-bag-coating":22},{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":7},0,24,false,"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"m6 9l6 6l6-6\"\u002F>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":9},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M5 12h14m-7-7l7 7l-7 7\"\u002F>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":11},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M4 5h16M4 12h16M4 19h16\"\u002F>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":13},"\u003Cg fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\">\u003Cpath d=\"M20 10c0 4.993-5.539 10.193-7.399 11.799a1 1 0 0 1-1.202 0C9.539 20.193 4 14.993 4 10a8 8 0 0 1 16 0\"\u002F>\u003Ccircle cx=\"12\" cy=\"10\" r=\"3\"\u002F>\u003C\u002Fg>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":15},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M7 7h10v10M7 17L17 7\"\u002F>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":17},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M2.992 16.342a2 2 0 0 1 .094 1.167l-1.065 3.29a1 1 0 0 0 1.236 1.168l3.413-.998a2 2 0 0 1 1.099.092a10 10 0 1 0-4.777-4.719\"\u002F>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":19},"\u003Cg fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\">\u003Cpath d=\"m22 7l-8.991 5.727a2 2 0 0 1-2.009 0L2 7\"\u002F>\u003Crect width=\"20\" height=\"16\" x=\"2\" y=\"4\" rx=\"2\"\u002F>\u003C\u002Fg>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":21},"\u003Cpath fill=\"none\" stroke=\"currentColor\" stroke-linecap=\"round\" stroke-linejoin=\"round\" stroke-width=\"2\" d=\"M18 6L6 18M6 6l12 12\"\u002F>",{"id":23,"title":24,"body":25,"date":268,"description":269,"extension":270,"image":271,"imageAlt":272,"meta":273,"navigation":274,"path":275,"readingTime":276,"seo":277,"stem":278,"tags":279,"__hash__":284},"blog\u002Fblog\u002Fpu-vs-pvc-vs-tpu-bag-coating.md","PU vs PVC vs TPU Coating: How to Specify Water Resistance on a Bag",{"type":26,"value":27,"toc":258},"minimark",[28,32,37,159,163,166,169,173,176,179,188,192,195,206,212,216,245,249],[29,30,31],"p",{},"A bag fabric without a coating absorbs water. Every polyester and nylon we sell for bag bodies is coated, and the coating - not the denier, not the fibre - decides whether the bag is shower-proof, waterproof, or a problem in January.",[33,34,36],"h2",{"id":35},"the-three-coatings","The three coatings",[38,39,40,58],"table",{},[41,42,43],"thead",{},[44,45,46,49,52,55],"tr",{},[47,48],"th",{},[47,50,51],{},"PU (polyurethane)",[47,53,54],{},"PVC (vinyl)",[47,56,57],{},"TPU (thermoplastic PU)",[59,60,61,76,90,104,118,132,146],"tbody",{},[44,62,63,67,70,73],{},[64,65,66],"td",{},"Applied as",[64,68,69],{},"Thin coating on the back",[64,71,72],{},"Thick coating or double-sided tarp",[64,74,75],{},"Laminated film",[44,77,78,81,84,87],{},[64,79,80],{},"Hydrostatic head",[64,82,83],{},"600-2,000 mm",[64,85,86],{},"Fully waterproof",[64,88,89],{},"> 5,000 mm",[44,91,92,95,98,101],{},[64,93,94],{},"Seams",[64,96,97],{},"Sewn (leak at needle holes)",[64,99,100],{},"Sewn or welded",[64,102,103],{},"Welded or sewn + taped",[44,105,106,109,112,115],{},[64,107,108],{},"Hand",[64,110,111],{},"Soft, matte back",[64,113,114],{},"Stiff, glossy",[64,116,117],{},"Smooth film; matte or gloss",[44,119,120,123,126,129],{},[64,121,122],{},"Cold behaviour",[64,124,125],{},"Flexible",[64,127,128],{},"Stiffens, cracks below 0 C",[64,130,131],{},"Flexible to -20 C",[44,133,134,137,140,143],{},[64,135,136],{},"EU retail",[64,138,139],{},"Fine",[64,141,142],{},"Often restricted",[64,144,145],{},"Preferred",[44,147,148,151,154,156],{},[64,149,150],{},"Relative cost",[64,152,153],{},"+",[64,155,153],{},[64,157,158],{},"+++",[33,160,162],{"id":161},"pu-the-default","PU: the default",[29,164,165],{},"A one- to three-pass PU coating is on nearly every 600D polyester roll. It stops rain soaking through the body panel and keeps the fabric soft. It does not make a bag waterproof - water enters at seams and zips - and the industry term for it is \"water-resistant\". That is enough for school, business and most travel bags.",[29,167,168],{},"Specify the hydrostatic head: 1,000 mm is standard; 2,000 mm for outdoor daypacks.",[33,170,172],{"id":171},"pvc-cheap-waterproof-cold-fragile","PVC: cheap, waterproof, cold-fragile",[29,174,175],{},"PVC backing on 600D polyester is the lowest-cost waterproof panel and the classic school-bag base. PVC tarpaulin at 450-900 gsm is the courier-messenger and tool-bag fabric. Both are wipe-clean and weld easily.",[29,177,178],{},"The catch is temperature. The plasticiser that keeps PVC flexible stiffens below freezing and the coating cracks when flexed. PVC also softens and smells in car-boot heat above 60 C. And European retailers increasingly restrict it for chlorine and phthalate reasons - if you must use PVC in the EU, specify a phthalate-free grade with a REACH screening report.",[29,180,181,182,187],{},"Full details on the ",[183,184,186],"a",{"href":185},"\u002Ffabrics\u002Fpvc-fabric","PVC coated fabric page",".",[33,189,191],{"id":190},"tpu-waterproof-without-the-compromises","TPU: waterproof without the compromises",[29,193,194],{},"TPU is a polyurethane film laminated to the base fabric. It is fully waterproof, welds for sealed seams, stays flexible at -20 C, contains no chlorine, and is recyclable. It is the specification behind every dry bag, roll-top and cooler liner sold in Europe.",[29,196,197,198,205],{},"It costs 2.5-4x PU-coated polyester and needs RF or hot-air welding equipment for sealed seams - which not every bag factory has. Our sister factory ",[183,199,204],{"href":200,"rel":201,"target":203},"https:\u002F\u002Fsenszxfactory.com\u002Fcustom-backpack\u002Fcooler-backpacks\u002F",[202],"noopener","_blank","welds TPU dry bags and cooler liners"," in-house.",[29,207,181,208,187],{},[183,209,211],{"href":210},"\u002Ffabrics\u002Ftpu-fabric","TPU laminated fabric page",[33,213,215],{"id":214},"decision-rules-we-use","Decision rules we use",[217,218,219,227,233,239],"ol",{},[220,221,222,226],"li",{},[223,224,225],"strong",{},"Warm market, cost-driven, work or school bag",": PVC-backed 600D or PVC tarpaulin.",[220,228,229,232],{},[223,230,231],{},"Any market, everyday bag, rain not immersion",": PU 1,000-2,000 mm.",[220,234,235,238],{},[223,236,237],{},"EU retail, cold climate, or eco claim",": TPU, or PU with a C0 DWR face finish.",[220,240,241,244],{},[223,242,243],{},"Must be submersible",": TPU with welded seams. Nothing else.",[33,246,248],{"id":247},"test-it-before-you-cut-it","Test it before you cut it",[29,250,251,252,257],{},"Every coated roll we ship passes coating adhesion and hydrostatic head on the inspection frame; TPU and PVC lots also pass a cold-flex test at the target market's winter temperature. The ",[183,253,256],{"href":254,"rel":255,"target":203},"https:\u002F\u002Fsenszxfactory.com\u002Fquality-assurance\u002F",[202],"six-gate bag QC process"," at the factory then checks seams on the finished sample - because a waterproof fabric with a leaking seam is still a wet bag.",{"title":259,"searchDepth":260,"depth":260,"links":261},"",2,[262,263,264,265,266,267],{"id":35,"depth":260,"text":36},{"id":161,"depth":260,"text":162},{"id":171,"depth":260,"text":172},{"id":190,"depth":260,"text":191},{"id":214,"depth":260,"text":215},{"id":247,"depth":260,"text":248},"2026-09-30","Most 'waterproof' bag failures are coating decisions. A plain guide to PU, PVC and TPU - what each does, where each cracks, what each costs - so the spec sheet says what you actually need.","md","\u002Fimg\u002Ffabrics\u002Ftpu-laminated-waterproof-fabric.webp","TPU laminated waterproof fabric roll",{},true,"\u002Fblog\u002Fpu-vs-pvc-vs-tpu-bag-coating",7,{"title":24,"description":269},"blog\u002Fpu-vs-pvc-vs-tpu-bag-coating",[280,281,282,283],"coatings","waterproof","TPU","PVC","aHHEIOUFvfVVwnYbO2mt-Vk8ILFm2e2IYyUPiTmWj2Q",1790668992724]