UHMW Liners– UHMW sheet is often used for lining chutes and hoppers to protect metal surfaces and to keep solid materials like sand, wood chips, or coal moving smoothly.
UHMW Parts– Easy to fabricate, UHMW is also used for packaging, conveyor, and food processing machinery parts including star wheels, idler sprockets, and under-chain wear strips.
UHMW Wood Replacement– UHMW offers very low moisture absorption and is a popular choice for marine construction applications like dock fender pads, pile guards, and anti-skid walkways. UHMW does not corrode, rot, or splinter like wood.
UHMW Grades– Several grades of UHMW are available, including reprocessed, enhanced bearing and wear, and FDA compliant.
Tech Tip– Ultra high molecular weight polyethylene has a relatively high coe
fficient of thermal expansion. This may make it difficult to hold tight tolerances on UHMW parts that will be exposed to changing temperatures.
Firstly, the thermal and mechanical properties of pure Uhmwpe Pipe were tested and are shown in . The equipment and methods used to determine the properties in were the same as those used to characterize OMMT-modified UHMWPE pipe in Section 2.4. Then, during our experiments and tests, the effects of the addition amounts of filler, compatibilizer, and coupling agent on the thermal and mechanical properties of OMMT-modified UHMWPE pipe were studied.
In order to study the effect of the addition amounts of the filler OMMT on the thermal and mechanical properties of UHMWPE pipe, OMMT-modified UHMWPE pipes were prepared using different addition amounts of OMMT. The other additives in are the processing aids calcium stearate and zinc stearate.
To better understand the changes in the bending and tensile strengths, small-angle X-ray diffraction (XRD) curves of OMMT and OMMT-modified UHMWPE (wOMMT = 8%) were compared, as shown in . It can be seen that the diffraction peaks of OMMT at the crystal (001) for OMMT and OMMT-modified UHMWPE (wOMMT = 8%) occur at 2θ = 3.314 and 2.538 deg, respectively. Then, the layer distances can be obtained by the Bragg equation:
2dsinθ=nλ
(2)
and the calculated layer distances for OMMT and OMMT-modified UHMWPE (wOMMT = 8%) are 2.663 and 3.477 nm, respectively.
Compared with that of OMMT, the diffraction peak for the crystal (001) of the OMMT-modified UHMWPE (wOMMT = 8%) moves to a smaller angle,
Attributes of UHMWPE Pipe
1. High Wear Resistant
Compare with existing plastic pipes, Wear resistant UNMWPE pipe has the most excellent wear resistance which is 4 to 7 times that of Q235 steel pipe and 2.7 times that of wear-resistant steel 16Mn. Therefore it increases pipe flow rate and improves the transmission efficiency of more than 20%. The working life of UHMWPE pipes is more than 3 times that of wear-resistant steel pipe. Wear resistant UHMWPE pipe has great advantages to replace traditional metal pipes in delivering abrasive media.
2. Impact Resistant
Wear resistant UHMWPE pipe is greatly impact resistant which is 5 times that of HDPE pipe, 2 times that of PC pipe and 10 times that of PTFE pipes.With extraordinary impact resistance，UHMWPE pipe can withstand great water hammer impact when starting up pump station.
3. Low Energy Consumption
Wear resistant UHMWPE pipe is self-lubrication and non-adhesive. Its coefficient of friction resistance is 0.009 while that of steel pipe is 0.013. With the same diameter, flow rate of UHMWPE pipe is larger than steel pipe, and with the same flow rate, UHMWPE pipe can save 25% energy.
4. Non-scaling
With roughness of 0. and smooth pipe inner wall, it can efficiently avoid scaling without acid cleaning, which save a lot of maintenance cost.
5. High Flexibility
With High Toughness and elongation of no less than 350%, the UHMWPE pipe and the connection site will not crack when crust settling which maximally ensures to supply water normally.
Coke, mining powder, pulp and slag from mining and metallurgy is quite abrasive to pipelines. Traditional steel pipe can only use for 6 or 12 months for transmission of above media and need to turn 90 degrees every half year. Meantime, UHMWPE pipe has extraordinary wear resistance which greatly reduces damage of pipes from abrasion and its working life is more than 4 times that of traditional steel pipe. With good impact resistance and high flexibility, UHMWPE pipe can withstand impact from external force and diastrophism. Wear resistant UHMWPE pipe is better alternative as transmission pipe for mining and metallurgy.
Custom sizes available, where moulds already exist from 20-mm OD, up to 65 WT. Product can be manufactured in any colour, and to all conformance requirements.
UHMW Polystone:
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Reduced coefficient of friction
Exceptional abrasion resistance
High-impact strength (will certainly not damage or ruin).
Chemical resistance.
FDA and also USDA accepted.
Broad temperature level variety (-450 ° to + 180 ° F). Little or no moisture absorption.
Noise resistance.
Easy to device.
UHMW Polyethylene stands for ultra-high molecular weight polyethylene which has outstanding abrasion and also influence resistance. It will certainly last longer than steel, nylons and also other engineering plastics under continuous wear applications. Usual uses include marine dock building, bed linings as well as fenders for autos and components for broadband equipment. UHMW Polyethylene is offered in virgin and also recycled; virgin UHMW polyethylene is FDA certified and can be utilized in food applications while recycled UHMW polyethylene is not FDA certified and typically utilized in industrial setups. Call Acme Plastics for more information regarding UHMW Tubes.
HDPE (high-density polyethylene) and UHMW (ultra-high molecular weight polyethylene) are both thermoplastic polymers made from ethylene monomers. The two plastics are indistinguishable based on appearance. The raw materials for both plastics are the reactive gases ethylene and hydrogen. These are polymerized in the presence of a catalyst, which differs depending on which plastic is being produced: a Ziegler-Natta catalyst for HDPE, or a metallocene catalyst for UHMW.
HDPE can be injection molded or blow molded, or formed into sheets and then further shaped using thermoforming, vacuum forming, or plastic welding techniques. It is a great option for manufactured chemical and water tanks. UHMW is a highly durable, affordable, and abrasion-resistant material used in a variety of wear applications. This article will compare the properties, applications, and costs of HDPE and UHMW.
High-density polyethylene, or HDPE, is a type of thermoplastic polymer. Compared to other polyethylene types, it has a high density (0.95 g/cm3). The polymer chains can be closely packed in this substance because the degree of polymer chain branching is quite low. HDPE is fairly hard and offers good impact resistance. HDPE’s properties are unchanged by exposure to temperatures of up to 120°C and are autoclavable as a result. Some of HDPE's key characteristics are: high impact resistance, autoclavability, opaque/translucent appearance, high strength-to-weight ratio, low liquid permeability, and good chemical resistance.
To produce HDPE, ethylene monomers, a Ziegler-Natta catalyst, hydrogen, and a comonomer are polymerized with a solvent. The solvent's main role is to carry heat away from the reaction sites where polymerization occurs. An external circulation heat exchanger then removes excess heat from the reaction chamber. The separation/drying process receives the reacted slurry. Transferring the slurry to a high-speed centrifuge allows the separation and recycling of the inert solvent from the newly-formed HDPE particles. The HDPE particles are dried under an atmosphere of high-temperature nitrogen and steam, which removes any remaining solvent, and leaves a dry, uniform HDPE powder behind.
In the powder dryer, the solvent is evaporated using high-temperature nitrogen and steam, which dries the wet powders. The scrubber recovers the solvent that has evaporated. The dried HDPE powder is transferred to an extruder, which melts and pelletizes the powder into the final raw HDPE material. Typical applications of HDPE include: containers for liquids, plastic shopping bags, pipe fittings, trays, and cutting boards. For more information, see our guide on What is High Density Polyethylene.
Both HDPE and UHMW have wide applications in many industries, due to their favorable properties. In some cases, these materials have shared applications, and for others, only one of the two materials is preferred due to its unique properties. The list below highlights some of the shared applications of HDPE vs. UHMW materials:
UHMW is a very durable lightweight material that is also chemical and corrosion resistant. Listed below are the UHMW exclusive applications:
HDPE also has a variety of unique applications. Durability and weather resistance are two of HDPE plastic's most appealing qualities: the material is resistant to insects, rot, mold, and mildew. Additionally, it is easily moldable into virtually any shape, making it ideal for a wide range of products that may spend a lot of time outdoors, such as:
It's also a common material for kitchen accessories. Cutting boards, cabinets, counters, tables, and small appliances can all be made of HDPE plastic, in addition to a variety of food and beverage container products.
Both HDPE and UHMW have some impressive physical properties. Table 1 below compares the two materials:
Both HDPE and UHMW are recyclable, and are considered to be environmentally-friendly plastics. HDPE is one of the easiest plastic materials to recycle. It can be remelted and made into new parts at least 10 times before the quality of the plastic is affected.
UHMW plastic cannot be recycled quite as easily as HDPE. It can only be recycled less than 10 times while maintaining its original properties. Recycled UHMW can be mixed into raw UHMW to further extend its recyclability.
The cost of both HDPE and UHMW varies depending on the form you purchase it in. The average price for HDPE is roughly $1.2 /kg, and the cost for UHMW can be anything between $2– and –$6 /kg.
Alternative materials to HDPE and UHMW include:
This article presented HDPE and UHMW, explained what they are, and discussed each are used in manufacturing. To learn more about HDPE and UHMW, contact a Xometry representative.
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