{"id":38558,"date":"2022-11-18T08:30:33","date_gmt":"2022-11-18T07:30:33","guid":{"rendered":"https:\/\/test-01.bergfreunde.de\/blog\/lets-talk-about-pu-coatings\/"},"modified":"2022-12-30T09:11:48","modified_gmt":"2022-12-30T08:11:48","slug":"lets-talk-about-pu-coatings","status":"publish","type":"post","link":"https:\/\/www.alpinetrek.co.uk\/blog\/lets-talk-about-pu-coatings\/","title":{"rendered":"Let’s talk about PU coatings"},"content":{"rendered":"
\n
\"Die
The PU coating is prefered in outdoor clothing<\/figcaption><\/figure>\n<\/div>\n\n\n

PU coatings… Anybody who\u2019s ever perused the intricate details of the production of outdoor clothing has probably stumbled upon this term at some point.<\/p>\n\n\n\n

But, have you ever asked yourself what the mysterious little abbreviation \u201cPU\u201d actually means? Or whether you actually need it? Could you do without it? Let\u2019s find out!<\/p>\n\n\n\n

Definition, properties and effect<\/h2>\n\n\n\n

Let\u2019s begin by having a look in our trusty internet dictionary to see what polyurethane means. This will tell us that polyurethane – PU for short – denotes as a class of synthetic materials. This class of synthetic materials is in rigid foam, flexible foam, liquid form or casting resin. The famous industrial chemist called Otto Bayer discovered the polyaddition for the synthesis of polyurethanes in 1932.\"\"<\/p>\n\n\n

\n
\"Polyurethane<\/a>
Rigid polyurethane foam insulation for houses<\/figcaption><\/figure>\n<\/div>\n\n\n

In fact, however, polyurethane is probably far more familiar to us than one might think. Since the 1940s, PU has found its way into industry at an almost breakneck speed. In addition to its more abstract uses, such as thermal insulation in houses or refrigerators, it is also found in everyday things. Whether in pot sponges, in our backpack straps, in plasters, in our mattresses, in skis, in its liquid form it is found in paints, varnishes or even in our cosmetics. We find polyurethane everywhere.<\/p>\n\n\n\n

Pretty useful stuff, right? But, what about all this talk about polyurethane coatings on apparel? Well, as the term already suggests, a \u201cPU coating\u201d is a protective film made of polyurethane. Simple, right? When used in its liquid form, polyurethane can be transformed into a permanent waterproof treatment. And this is precisely where things get interesting for us outdoorsy folk.<\/p>\n\n\n\n

In order to provide textiles with an additional layer of protection, a thin film of liquid PU is applied to the garment. The PU coating has extremely strong water-repellent characteristics and is even capable of making fabrics completely waterproof! Such a film can be applied once or multiple times. One coat is appropriately called single-coated, whilst multiple coatings are referred to as multicoated. Depending on the area of use, manufacturers treat either the entire surface of the garment or just single fibres. Besides waterproofing the garment, PU coatings also make the fabric more robust and more resistant to tears, kinks and abrasion. These coatings also happen to be very flexible and durable. Plus, thanks to modern manufacturing processes, it\u2019s now even possible to make breathable PU fabric! Magical, right?<\/p>\n\n\n\n

The upsides and downsides of polyurethane coatings<\/h2>\n\n\n\n

Permanently waterproof<\/h3>\n\n\n
\n
\"Two<\/a>
PU coatings are primarily used for outdoor clothing<\/figcaption><\/figure>\n<\/div>\n\n\n

\"\"The advantages of a polyurethane coating cannot be denied. The most important advantage is the permanent impermeability it gives to the fabrics. Unlike a conventional impregnation or a DWR, a PU coating is resistant for a long time. However, not for eternity either! Even a PU coating will leak at some point. But we are talking about a very, very long period of time. As long as most of us will use a jacket or gloves. So that can be safely disregarded.<\/p>\n\n\n\n

Quite heavy<\/h3>\n\n\n\n

A real disadvantage is definitely the weight of a PU coating. A polyurethane coating may be nothing more than one (or multiple) layer(s) of plastic, but it does have some weight to it. In fact, polyurethane-coated fabrics tend to be heavier than those treated with DWR. So, if an ultra-light garment is what you want, I\u2019d steer clear of PU-coated apparel.<\/p>\n\n\n\n

Bulky<\/h3>\n\n\n\n

A polyurethane coating also has a certain amount of volume to it, so a polyurethane-coated jacket would be somewhat bulkier than a \u201cnormal\u201d outdoor jacket<\/a> as well. True, that may just be an aesthetic disadvantage, but for me, PU-coated textiles look so much heavier than those with a DWR treatment. Personally, I\u2019d prefer to wear something lighter and less bulky. But that\u2019s just me!<\/p>\n\n\n\n

Durable<\/h3>\n\n\n
\n
\"Reusch
Reusch – Isak GTX – Gloves with PU coating<\/figcaption><\/figure>\n<\/div>\n\n\n

On the plus side, polyurethane has protective properties. The additional plastic layer gives a fabric a decent degree of durability. Not least because of this, tent<\/a> floors are very often equipped with a textile coating of polyurethane. The floors of tents are constantly exposed to heavy loads due to small pebbles on the ground, sand, roots, sticks and stones as well as natural friction from the person(s) resting on them. The PU coating provides the necessary abrasion resistance. Furthermore, a polyurethane coating is elastic and kink-resistant. The fabric does not lose its protection when it is crumpled or folded.<\/p>\n\n\n\n

Breathable\"\"<\/h3>\n\n\n\n

Polyurethane-coated textiles have had one major thing going against them: their lack of breathability. But we can breathe easily now that that\u2019s no longer the case! Thanks to modern technology, PU-coated fabrics are highly breathable as well. One such modern technique is called a microporous coating. Basically, this is a PU coating that contains billions of tiny holes. These holes are so small that water vapour can escape to the outside, but moisture can\u2019t get in. Voil\u00e0! Breathability! Fortunately, these coatings are not as expensive as you would think and are now widely used for outdoor textiles.<\/p>\n\n\n\n

Environmental impact and uses<\/h2>\n\n\n\n

Of course, there\u2019s a lot to be said for PU coatings in terms of environmental sustainability as well. A PU coating is clearly the environmentally friendlier alternative to many DWR treatments. Admittedly, polyurethane is by no means the environmental angel hovering over the outdoor industry. Quite on the contrary! When it comes to the production and the disposal of polyurethane, it can get pretty problematic. But in comparison to a fluorocarbon DWR, PU is as innocent as a lamb. Fluorocarbons (perfluorocarbons or PFCs) are very harmful to the environment and can be harmful to our health as well. That\u2019s why so many outdoor clothing companies steer clear of them. When compared to PVC coated fabrics, which contain toxic plasticisers, PU definitely comes out ahead.<\/p>\n\n\n\n

Areas of use<\/h2>\n\n\n
\n
\"\"
L\u00f6ffler<\/a>\u00a0\u2013 Bike Hooded Jacket WPM-3 CF is a windproof and waterproof cycling jacket<\/a><\/figcaption><\/figure>\n<\/div>\n\n\n

So, now that we know a bit more about polyurethane, the coatings themselves and the pros and cons of the polymer, we can move on to what a PU coated garment is best suited for. Nobody\u2019s going to wear a heavy coated jacket for a trail run on a warm sunny day. Rainy and damp weather is where these garments are at their best.<\/p>\n\n\n\n

Bad weather<\/h3>\n\n\n\n

As a general rule, we can say the PU-coated garments are best for \u201cnormal\u201d bad weather. If the fabric and seams are nice and sealed, even the craftiest of raindrops won\u2019t be able to penetrate your garment. Even though modern coating techniques have made it possible to manufacture breathable PU-coated fabrics, you shouldn\u2019t wear them for highly aerobic activities in bad weather. Look for an alternative instead. Why? Well, for one thing, the breathable properties will never suffice for high-intensity physical activity. For another, the coated fabric will just weigh you down.<\/p>\n\n\n\n

Durable clothing<\/h3>\n\n\n\n

For bad weather and when you need a particularly strong and abrasion-resistant garment, PU-coated fabrics are the way to go. Polyurethane-coated Cordura (a particularly strong polyamide fabric), for example, can withstand the sharpest of rock edges without any damage. Pretty neat, right?<\/p>\n\n\n\n

Well, that\u2019s about it for polyurethane-coated textiles. You\u2019re all probably sick and tired of reading the word polyurethane, anyway! Still, I hope I was able to shed some light on the mysterious polymer that is PU!<\/p>\n\n\n\n

Buy outdoor clothing here >><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

PU coatings… Anybody who\u2019s ever perused the intricate details of the production of outdoor clothing has probably stumbled upon this term at some point. But, have you ever asked yourself what the mysterious little abbreviation \u201cPU\u201d actually means? Or whether you actually need it? Could you do without it? Let\u2019s find out! Definition, properties and […]<\/p>\n","protected":false},"author":26,"featured_media":61764,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[209],"tags":[182,27,184,183],"post_folder":[],"class_list":["post-38558","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fabrics-technologies","tag-bike","tag-hiking-trekking","tag-running","tag-winter-sports"],"acf":[],"yoast_head":"\nWhat is PU Coating? 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