After years of searching, we finally found a 20D lightweight PE-coated fabric that was strong enough to use on the floor of our Portal tent. Powder coating involves curation with high temperatures, however, which can set off some warning bells for a lot of people. First, waterlogged PU coatings take longer to dry out. PU can achieve high hydrostatic head ratings, it can accept fire retardants to meet CPAI-84 standard, it’s inexpensive, and it doesn’t reduce the fabric’s tear strength as much as PE coatings do. The molecules that comprise organic polymers have carbon backbones, whereas silicones are built around a highly stable Si-O bond. For tents that will be exposed to large amounts of moisture, PU coatings are often used because they can achieve hydrostatic head ratings in excess of 10,000mm (that’s a lot). Storing your tent in a dry environment will also prolong the life of your tent. This is rarely an issue in terms of water actually penetrating into a tent, as the process is quite slow. There are a few minor issues with silicone from a functional standpoint. Thanks for putting the time and effort into breaking it all down. What it is made up of? The cherry on top (or maybe the sundae itself, depending on your priorities) is that silicone coatings don’t hydrolyze. The fly is almost always made of a woven fabric (learn more about wovens vs. nonwovens in, The fabric finishing process begins with an undyed, uncoated fabric, called. There are a few minor issues with silicone from a functional standpoint. As I mentioned above, silicone is often used as a lubricant. This means the stress is much more concentrated and the fabric is more likely to tear. ”. After years of searching, we finally found a 20D lightweight PE-coated fabric that was strong enough to use on the floor of our Portal tent. However, this has the disadvantage of adding considerable weight (coatings, especially PU coatings, are surprisingly heavy) and further reducing tear strength. This technique determines how much water pressure must be exerted on a fabric before it begins to pass through. What many overlook is the fact that these paper cups are coated with a tiny layer of wax, which is essential to prevent water from seeping into the paper. CLEANsafe 120 CLEANsafe 120 Low Density Polyethylene can be processed by injection molding or rotomolding also. The first industrially practical polyethylene synthesis (diazomethane is a notoriously unstable substance that is generally avoided in industrial application) was again accidentally discovered in 1933 by Eric Fawcett and Reginald Gibson at the Imperial Chemical Industries (ICI) works in Northwich, England. Occasionally, you may come across tents made with fabrics that are waterproof without the use of a coating. 3PE coating steel pipe mainly use hot melt and fused connection, keep the interface and pipeline connect as a whole. PE coating provides an excellent protection due to its properties such as resistance to aging and impact. The reaction can be delayed as long as possible by storing your tent in a cool, dry, dark place, but sooner or later it will succumb to the stinky inevitability of organic chemistry. This makes it difficult to maintain a taught pitch in humid and wet conditions. As for other companies using PE, I don’t know for sure, as many companies don’t share that information, but I believe Nemo is using a sil/PE on some of their fabrics, and I think Mountain Hardwear uses (or at least used to use) a PE on the floor of their Trango series. When silicone coats the yarns in a fabric, as it does when it is applied as a coating, it makes it easier for the yarns to slide over one another. The first issue we have with PU is that it decreases the tear strength of the fabric to which it is applied. As I mentioned above, silicone is often used as a lubricant. This is almost always accomplished by using waterproof fabrics. Name: PE Coated Steel Pipe TYPE : PE Coated Pipe, 2PE Coated Pipe It’s a fairly specialized technique but most premium factories have this capability. Polyethylene is made by addition or radical polymerization of ethylene (olefin) monomers. Very good resistance to alcohols, dilute acids and alkalis 3. Low Density Polyethylene (LDPE) is a semi-rigid and translucent polymer. So Please keep sharing. Long-term waterproofness is another area in which PU coatings have some drawbacks. This isn’t to say that non-PU-coated tents should be stored wet. , and aren’t often used in tents. Turns out, it isn’t just safe for the environment, but it can be actively beneficial. This hasn’t been an issue in our experience. If this bothers you then you should stop reading now and go camping instead. Both the forms of polyethylene are recyclable and used to produce bottles for non-food items, plastics for outdoor applications, compost bins, etc. While a good scrubbing may temporarily get rid of some of the most offensive volatiles, it’s a purely symptomatic treatment. High Density Polyethylene Chemical resistance: Very good resistance to alcohols, dilute acids and alkalis, Poor resistance to hydrocarbons (aliphatic, aromatic, halogenated), Continuous temperature: -50°C to +60°C, Relatively stiff material with useful temperature capabilities, Higher tensile strength compared to other forms of polyethylene, Low cost polymer with good processability, Excellent electrical insulating properties, High-frequency welding and joining impossible, Good resistance to alcohols, dilute alkalis and acids, Limited resistance to aliphatic and aromatic hydrocarbons, mineral oils, oxidizing agents and halogenated hydrocarbons. Stuff really doesn’t stick to it, including more silicone. Storing your tent in a dry environment will also prolong the life of your tent. . PE is not available for 3D Printing processes because it is more difficult to work with it. To propagate the tear, you’ll have to rip through several yarns at once, rather than one yarn at a time. Easily Avoid Disruptions in Your Injection Molding or Extrusion Production Line. A good way to visualize this is to picture a tall tube with a piece of fabric stretched across the bottom end. From plastic containers, bottles, bags to plastic toys; everywhere we look, we see most of the plastic items made of polyethylene! Despite its nostalgia, “Old Tent Smell” means that your beloved tent has entered its sunset years. The laminates you’ll usually see used in shelters are Dyneema Composite Fabric (aka Cuben Fiber) and waterproof breathable fabrics (WPBs) that are used in most single-wall tents. Over time, the PU coating reacts with moisture in the air (this process is accelerated by heat) and splits the polyester urethane molecule. This means the stress is much more concentrated and the fabric is more likely to tear. The chemical properties that make silicone such a diversely utilized class of compounds (nonstick, chemically inert, hydrophobic) also make it an excellent material for waterproofing tent fabrics. Of the three coatings discussed here (PU, PE, and silicone), PU has the worst hydrolytic stability. For tents that will be exposed to large amounts of moisture, PU coatings are often used because they can achieve hydrostatic head ratings in excess of 10,000mm (that’s a lot). PE, polyurethanes and PVC are widely used thermoplastics for agricultural pipes, tubing, hose pipes and for creating custom pipe solutions. Another issue is that because sil/sil fabrics can be quite slippery, some people don’t like to use them in floors. 3PE Coating Pipe has three layer PE antisepsis structure: the first layer with epoxy powder (FBE> 100um) the second layer with adhesive (AD), 170 - 250um the third layer with polyethylene (PE… , slide over one another. One of the most important functions of a tent is (obviously) to keep you dry. First, the tear strength of sil/PU fabric is still lower than the tear strength of the fabric before coating because of the PU. Thanks for sharing this wonderful content and such a nice information for me. These fabrics are usually, (multiple layers of material sandwiched together and adhered with heat or adhesive). B.C. Low Density Polyethylene (LDPE) uses majorly revolve around manufacturing containers, dispensing bottles, wash bottles, tubing, plastic bags for computer components, and various molded laboratory equipments. 48 Hours Domestic Delivery by Truck. John- I’m not aware of any consumer-facing company that sells PE, and as far as I know, PE requires a fair amount of specialized equipment to apply. This is accomplished by measuring how tall a column of water is before the weight of the water exerts enough pressure to start pushing it through the fabric. As you would expect, ripping through five yarns at once is harder than ripping through one, and a fabric with more slippage will have a higher tear strength. It is produced at high pressure (1000-3000 bar; 80-300°C) via free radical polymerization process. This happens because of the way the coating affects the slippage of the fabric. PE has similar characteristics to PU in that it can be combined with fire retardants and is applied in a similar manner, but with a few major differences that make it better for some applications and worse for others. Alternative barrier coating products that are safe for the environment are in favor due to brand marketers, legislative, political and consumer pressure. This protective coating can be applied after manufacture and either before or after the electronic components have been soldered on. In my experience, the same base fabric with a sil/sil coating costs 10-30% more than it would with a sil/PU coating. In many instances, rather than using a coating, food manufacturers will use uncoated metal that has been specially finished to enhance smoothness and resistance to corrosion. Uncoated (i.e., breathable) tent canopy fabrics will absorb water and grow mold, but at least your silicone or PE-coated floor and fly might be spared. 1. High density polyethylene is flexible, translucent/waxy, weather resistant, and displays toughness at very low temperatures. However, because they can be mixed with fire retardants, PE makes it possible to avoid many of the shortfalls of PU coatings while avoiding state-by-state shipping restrictions. High impact strength at low temperature, good weatherability. Resin Identification Code for two main forms of polyethylenes are: LDPE and HDPE are non-biodegradable in nature and contribute significantly to the world’s plastic waste products. However, it can be problematic if you’re camping for a long time in especially wet areas or in a spot where water pools under your tent. PU’s water absorption causes a few additional problems. The 3PE Epoxy coated steel pipe is with 3 layer coatings, first FBE coating, middle is adhesive layer, outside polyethylene layer. The PE coating also provides a simple yet efficient way of sealing the package. Coating involves the application of a liquid that adheres to the fabric and then is cured, leaving the fabric waterproof. Also, because the two coatings are not applied simultaneously, achieving the ideal thickness on each side of the fabric is a tricky balancing act. It provides a good combination of barrier and sealability characteristics. One is that it can’t be seam-taped effectively. decrease the fabric’s tear strength. Polyether urethane is the other member of the polyurethane family that is used in outdoor applications. While WPBs often have a Durable Water Repellent (DWR) finish, they don’t get their waterproofness from the DWR. We almost never come across hydrolyzed PE coatings, and the ones that we have encountered have usually been used for a long time in particularly hot and humid conditions (if you want your tent to last a long time, don’t move to the Philippines or Singapore). Even with the 1500mm 30D sil/sil nylon used in the floor of our WindSaber, we have not had any issues with leakage, except when one user set theirs up on top of a small stream. It’s hydrophobic and even when left in prolonged contact with water, it doesn’t wet out, even when compared to a PU fabric with a better water column. Sometimes you even have to call brands to get a straight answer. We have never seen a case of mold growth on a silicone-coated fabric (again, this doesn’t mean you should put your tent away wet! If it soaks in too far while it’s being applied, it can lead to coating adhesion failures when the PU is applied. Over time, the PU coating reacts with moisture in the air (this process is accelerated by heat) and splits the polyester urethane molecule. Now, if you’re wondering what a polymer is – it is a synthetic compound made from petroleum residue. As long as you store your tent properly, your sil/sil fabrics will outlast all other coatings and coating combinations. Many online retailers don’t have the ability to restrict sales on a state-by-state basis (most notably Backcountry.com), so as long as the 800-pound gorilla that is California restricts sales of tents made with sil/sil fabrics, the industry will be slow to switch. This is why the unit for waterproofness is millimeters (mm) and also why the waterproofness of a fabric is also referred to as a “. Poly (PE) Replacement Barrier Coatings. There is no water and gas leakage. When I first encountered this on my dad’s 1970s North Face VE-24, I tried as many homespun cures as I could, to no avail. While a good scrubbing may temporarily get rid of some of the most offensive volatiles, it’s a purely symptomatic treatment. First, the tear strength of sil/PU fabric is still lower than the tear strength of the fabric before coating because of the PU. Preferred global supplier of coating application services in the medical device industry welcomes Michael Duquette to its team Boston, MA – August 14, 2020 – Precision Coating Co., Inc. (PCCI) is pleased to announce the newest member of its senior… The fabric finishing process begins with an undyed, uncoated fabric, called greige (pronounced GRAYGE). Don’t even think about it!). Sometimes you’ll see misleading things like “fly and floor are silicone treated”, “coated in a durable silicone repellent”, or “silicone-treated ripstop nylon”, when companies are actually using sil/PU or sil/PE fabrics, so make sure to get into the nitty-gritty tech specs to make sure you actually know what you’re getting. PE Coated steel pipe is processed through the preservation process , which can effectively prevent or slow down the process in the transport and use of chemical or electrochemical corrosion reaction of steel pipe . Kuivassa ja viileässä sisäloissa +5oC — +25oC. However, if you’re hoping to be using your tent a decade from now, then it would be a good idea to seek out tents without PU coatings. PE coatings stretch even less than PU coatings, and they all but eliminate slippage in the fabrics to which they’re applied. (Chemical formula of Ethene - C. PE belongs to polyolefin family of polymers and is classified by its density and branching. High gas permeability, particularly carbon dioxide, Excellent for mild and strong buffers, good chemical resistance, Good water vapor and alcohol barrier properties, PE films burn to carbon dioxide and water with no residue. Continuous temperature: -50°C to +60°C, Relatively stiff material with useful temperature capabilities 5. This combination provides some of the benefits of silicone (more hydrophobic, better long-term waterproofness, etc.) They are far less prone to hydrolyzing than PU coatings. Long-term waterproofness is another area in which PU coatings have some drawbacks. This is why the unit for waterproofness is millimeters (mm) and also why the waterproofness of a fabric is also referred to as a “water column”. It is far less common than PU, probably because it’s more expensive and simply because it’s not as well known. In this article, we’ll be taking a journey of discovery through the most common waterproof coatings used in tents: polyester urethane (PU), polyether urethane (PE), and silicone, and combinations thereof. Water takes a long time to penetrate PU, which is why PU works as a waterproof coating. A In conventional paper cups they are coated with PE (Polyethylene) derived from oil, to make board waterproof. That’s also a huge no-no. Proper care and storage will prolong the lifespan of your PTFE-coated cookware. Seam tape is what keeps sil/PU fly fabrics from leaking through the needle holes created when the tent is sewn. The most popular application of low density polyethylene is plastic bags. All our sil/sil flies are sewn with double needle lap-felled seams. This range of products is suitable for roofing and cladding, offering a limited level of performances and not recommended when a very good level of outdoor resistance needed as well as … Polyethylene (PE) is a petroleum-based coating on paper cups that can slow down the process of biodegrading of the paper it coats. This limits its usage in applications requiring extreme temperatures. The surface quality of the three-layer polyethylene coating is checked with 25 kV high voltage and covers 100 % of the surface. The weight and composition of the fabric as well as the intended application are both important factors in coating choice. In solid form, no. If it soaks in too far while it’s being applied, it can lead to coating adhesion failures when the PU is applied. The aim is to reduce the use of petroleum based plastics. When you try to tear a fabric, slippage allows the yarns to bunch up, rather than remaining fixed in position. ), blow molding and rotomolding. Sometimes you even have to call brands to get a straight answer. The odor is a byproduct of a reaction called, . It’s also used as a coating on paper cups to make them strong and waterproof. Some names for specific fabrics using silicone coatings are silnylon (referring to nylon that has been silicone coated) and silpoly (silicone coated polyester, which is less common due to polyester’s poor tear strength but is sometimes used in tarps). It has excellent mechanical properties such as high abrasion resistance, impact strength and low coefficient of friction. Turvallisuus ohje Ei sisällä ympäristölle eikä ihmisille vaarallisia ainesosia. Polyurethane Coating. First, waterlogged PU coatings take longer to dry out. UHMWPE is suitable for high wear applications such as tubes, liners, silos, containers and other equipments. Unfortunately, one of those states is California, which I am told has at least several people and one or two parks. Compared to HDPE, it has a higher degree of short and long side-chain branching. Temperature resistance up to 80°C continuously and 95°C for shorter times. Right Packing=Safe Packing - On Time Delivery. DNLF seams aren't as effective with PU or Sil/PU fabrics as the PU wets out and facilitates moisture wicking in through the thread. The tube gets filled with water until it soaks through the fabric. and still allows the requisite fire retardants to be mixed into the PU side to achieve CPAI-84 standard. Applications of High Density Polyethylene (HDPE). Fortunately, there’s a solution for tents. Steve, explains why it’s all in the coating. Humidity alone can destroy coated fabrics and factory hot-taped seams. The result is that PE coatings often decrease the fabric’s tear strength. This is why it’s possible to make silicone that’s safe for use in cooking tools or internal applications like implants. In the case of fabrics with low slippage, adjacent yarns are not recruited to resist the stress, which then gets applied to only one yarn at a time. Just wanted to say that this was the most straight forward, informative article I’ve read on this. Various forms of Polyethylene can be used in processes like injection molding, blow molding, extrusion and various film creation processes such as calendaring or blown film extrusion. Additionally, the PU component of this coating technique is still not immune to hydrolysis (discussed below), and will eventually break down. Occasionally, you may come across tents made with fabrics that are waterproof without the use of a coating. Spatulas, lubricants, sealant, greases, implants, wire insulation, and tents? We use PE-coated fabrics on the 70D and 210D floors of our expedition series tents, because those fabrics start out with an extremely high tear strength, so the burliness of the fabric itself is more than enough to compensate for the reduction in tear strength by the PE coating. Because PU is much more common than PE, when the outdoor industry says “polyurethane”, they’re talking about poly. However, if there’s enough moisture in the environment, water will eventually saturate the PU coating and go into and through the fabric, causing the coated fabric to leak. For which requirements is it a material of choice? Delicate food cooked at lower temperatures comes out better using nonstick cookware. Amidst growing concerns around the health risks of fire retardants, the number of states that restrict tent sales through CPAI-84 has dropped to three. PE is the most frequently used product for frozen food. Ultra-high-molecular-weight polyethylene (UHMWPE), High Degree of short chain branching + long chain branching, Linear (or Low degree of short chain branching), Using radical polymerization using tubular method or auto clave method, Using Ziegler-Natta catalyst or metallocene catalyst, Low crystalline and high amorphous (less than 50-60% crystalline), High crystalline and low amorphous (>90% crystalline), Shrink wrap, films, squeezable bottles garbage bags, extrusion moldings, and laminates, High performance bags, cushioning films, tire separator films, industrial liners, elastic films, ice bags, bags for supplemental packaging and garbage bags, High-molecular-weight polyethylene (HMWPE), Ultra-low-molecular-weight polyethylene (ULMWPE), Modifying natural gas (a methane, ethane, propane mix) or, The catalytic cracking of crude oil into gasoline. My thoughts and praise have already been given by Mike, and then John Sumpter, June 10, 2020. hydrolysis). The sheer availability of PE is encouraging efforts to apply this material for additive manufacturing. In a traditional double-wall tent, there’s a waterproof outer layer called a, and a breathable inner tent body with waterproof floor and sidewalls. If the PU is applied to silicone-saturated fabric it can peel off prematurely, leading to compromised waterproofness. PU offers a solid balance of attributes, which is why it is by far the most popular waterproof coating for tent fabrics. Mold and mildew are some of the top tent killers out there. Coating Safety NPCA 1 Coating Safety What is a coating? The silicone cannot be allowed to penetrate all the way through the fabric. Stuff really doesn’t stick to it, including more silicone. Polyurethane coatings have proven to be the ’workhorse’ barrier membrane material, with permeability control achieved variously from pores generated during the coating of pre-polymer, through electrospinning of nano-fibres or through inclusion of hydrophilic component groups opening a route for glucose transport [50,74,75]. Generally speaking, PE is used in burlier tents in harsher environments. I know of only three companies that use them, and two of them (SlingFin and Mountain Hardwear) were founded by the same person. 1. This is rarely an issue in terms of water actually penetrating into a tent, as the process is quite slow. Moderate resistance to oils and greases 4. Although PU is the standard and works pretty well under a variety of conditions, there are some drawbacks that make us think that PU is over-utilized in tents. For this reason, storing a PU-coated tent long-term when it’s still wet means almost certain death to your fabrics. Alternative barrier coating products that are safe for the environment are in favor due to brand marketers, legislative, political and consumer pressure. This makes PU ideal for applications when there will be a lot of pressure exerted on a fabric, like if you’re using a cot in your tent. However, there are some drawbacks to this. The material is almost totally inert, therefore it is used in the most corrosive or aggressive environments at moderate temperatures. It conventional methods such as injection, blow or extrusion molding, because this material does not flow even at temperatures above its melting point. 1. Sometimes you’ll see misleading things like “fly and floor are silicone treated”, “coated in a durable silicone repellent”, or “silicone-treated ripstop nylon”, when companies are actually using sil/PU or sil/PE fabrics, so make sure to get into the nitty-gritty tech specs to make sure you actually know what you’re getting. Usually it’s nylon in higher-end tents and polyester in less expensive tents. Zhejiang Libangwei Automation Equipment Co., Ltd. 1,391 views Silicone-coated fabrics last longer and have numerous advantages over PU and PE coatings. The tube gets filled with water until it soaks through the fabric. This isn’t to say that non-PU-coated tents should be stored wet. You can get your fly almost totally dried out just by giving it a good shake. Yes, I know that from a strict organic chemistry perspective “PU” should technically encompass both polyester and polyether urethanes, but this isn’t an organic chemistry class (thank goodness) and I’m going to use the verbiage the outdoor industry has adopted as standard. In this article, we’ll be taking a journey of discovery through the most common waterproof coatings used in tents: Before we get into the really exciting stuff, a quick note about how the outdoor industry quantifies waterproofness: waterproofness is typically measured via a process called, (HH) testing. These special properties allow the product to be used in several high performance applications. The products of this reaction are smelly, sticky, and are not waterproof. It’s the type of plastic most commonly used around the world for plastic bags, packaging, and containers. This also means that silicone imparts an unmatched level of mold/mildew resistance. , nylon will sag when it gets wet, so PU-coated fly fabric has the tendency to sag. In our experience, silicone has proven to be the best tool for making a fabric durably, reliably waterproof. PE has several advantages that make it a great choice for floor fabrics. 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