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Posts Tagged ‘Plastic’

High-density polyethylene (HDPE) is a type of plastic made from petroleum. Since subsequent melting and shaping can remould this material, it is classified as a polyethylene thermoplastic. It can also be joined in segments when welded or machined. However, it does not accept adhesives very well. Also known as polyethylene high-density (PEHD), products made of high-density polyethylene are marked by the imprint of the number “2″ surrounded by the Möbius strip recognized as the universal recycling symbol.

As the name implies, high-density polyethylene is denser than most other polymer plastics, namely low-density polyethylene. This is due to its crystallization structure occurring in a linear fashion rather than branching out to form long chains of polyethylene. Instead, the lack of branching results in its carbon molecules bonding with more hydrogen molecules. This allows the final product to possess greater tensile strength, even though it is lighter than water. It also makes high-density polyethylene highly resistant to acids and solvents.

The production of high-density polyethylene does not happen by accident or natural event, however. In fact, the lack of branching during the polymerisation process is deliberately induced by the addition of a type of reagent known as a Ziegler-Natta catalyst. Usually, these catalysts are derived from titanium compounds.

Since high-density polyethylene is so durable and chemically non-reactive, it has numerous applications in various industries. It is used in many different types of packaging containers, such as milk and laundry detergent bottles, as well as plastic grocery bags. It is also found in storage systems designed to store chemicals and fuels. In fact, high-density polyethylene is used to produce materials to act as chemical barriers, such as liners that are placed under landfills to help prevent soil and groundwater contamination. One of the most common uses of this material is in the manufacturing of wood plastic composites to make furniture, flooring, fencing, and landscaping materials.

In terms of environmental impact, products made of high-density polyethylene do not readily biodegrade in landfills. Such products can be recycled, though, albeit at the risk of losing some of its original tensile strength. Since this material is constructed of hydrogen and carbon, being subjected to high heat merely results in the release of water and carbon dioxide. However, additives, such as fire retardants, UV-stabilizers, and dyes, can produce other toxins.

Related Polyethylene Welding Articles

With the high price of plumbers it is understandable that so many people are now deciding that the do it yourself route is a far more affordable option. Plastic pipe is the perfect material for the job as even the lay man can manage to put together a piping system. Naturally plastic pipe is an umbrella term that covers a number of different plastics, usually of the thermo variety but still disparate enough to note the differences. Here are some of the most popular plastic pipe variants used.

PVC or polyvinyl chloride is an extremely popular plastic in the piping world; it is extremely rigid and is adept at resisting many chemicals. The main form of welding is though solvents and is predominantly used for applications such as sewers, drain pipes and cold water pressurised water piping. It comes in a variety of different colours.

ABS or acrylonitrile butadiene styrene is used for many of the same purposes as PVC although its chemical resistance is lower and it is normally produced with a black colouration.

CPVC or chlorinated polyvinyl chloride is like PVC but stands up to high temperatures more effectively and hence is used for hot and cold water supply applications.

The previous three plastic pipe variants are all rigid whereas PB (polybutylene) and PE (polyethylene) are flexible; the former being rigid and used for the same purposes as CPVC and the latter being low cost. Both of these types are not joined with solvents but are instead formed with mechanical and clamped couplings.

In terms of buying the pipe for your plumbing needs pipes normally come in sizes along two lines, these being pipe sizes and tubing sizes. Pipe sizes relate to the old steel pipes while tube sizes relate to copper tube. It is important to note that different plastic pipes should not be connected together, like for like connections are always advisable. Because the plastic pipe industry moves quickly it is important to recognise that building regulations should always be consulted before undertaking any work.

For instance regulations permit the use of CPVC and PB pipe for hot water applications. These two pipes are perfect for constructing in-home hot water systems as they are corrosion free and durable. It should be remembered however that this form of pipe should not be used for electrical grounding as it is non-conductive. PVC pressure pipes should predominantly be used for cold water movement in outdoor areas; such as water sprinkling systems in gardens. PE pipe is similar although it is flexible rather than rigid, and is perfectly suited to deep piping well purposes.

There are two major methods of fitting piping systems together; these are solvent welding and mechanical coupling. Solvent welding is simple enough although care should be taken to carry out the task effectively to prevent any leaks. The pipe must be cut squarely, cleaned thoroughly, coated with solvent and then joined with the fitting piece. It should be remembered however that cuts are final, there is no way back should you cut the pipe too short. Mechanical coupling however is used with plastic pipes that cannot be welded with solvents. Normally it requires a simple click into place as the fittings have barbs and clamps that prevent leaking.

Hopefully this information has given an idea on the types of plastic pipe out their and their uses. Additionally it is also hoped that the information on fitting will give DIY enthusiasts the knowledge that is needed to construct their own plumbing systems.

• Fills holes and voids
• Dries black

Product Description
Plastic Steel/Steel Weld Epoxy is a two part, fast curing, high strength, general purpose epoxy. A cold welding compound, when fully cured it can be drilled, threaded, machined, tapped or filed. Contains a steel alloy that does not rust. WORKS BEST ON: All metals, steel, stainless steel, aluminum, brass, iron, pewter.. Does not bond to polyethylene or
polypropylene plastics. DO NOT USE ON AREAS THAT WILL COME IN CONTACT WITH FOOD RELATED ITEMS. USE ON: Household, industrial, automotive and crafts that require a high-strength, high quality bond. Can be use to repair cracked housings, cover and cylinder heads, gas tank leaks, radiator leaks, torn keyways, stripped threads, worn pulleys, toys, broken furniture, tools, appliances. Fills holes and voids. Dries black.

Devcon Plastic Steel Weld Epoxy 2oz 52345 3 Pack FREE SHIPPING

Variable temperature control allows you to easily repair plastic bumpers, grills, door panels or any plastic part like a professional. Visit www.eastwood.com

Plastic Welding made easy with the Leister Triac S

Video demonstration of a bumper cover being welded with an airless plastic welder.

• Sold Individually

Product Description
Item #: 230-14320. Toughened adhesive for high strength load-bearing bonds to engineered plastics, metals, composites, ceramics, and dissimilar substrates

• Capacity Volume = 47 mL
• Packing Type = DevPak
• Color = Straw
• Gap Fill = 1/8 in
• Adhesive Tensile Shear = 3500 psi
• Viscosity = 50000.0 cP
• Hardness = 78.0 Shore D
• Temp. Range = -40.0 øF [Min], 250.0 øF [Max]
• Fix Cure Time @ Temp. = 1 h @ 72 øF
• Full Cure Time @ Temp. = 4 h @ 75 øF
• Chemical Compound = Methyl Methacrylate
• Applications = Multi-Purpose
• Applicable Materials = Wood, Most Metals, Ceramic, Concrete, Plastic, PVC, Fiberglass, Steel, Aluminum, Stainless Steel, PET
• Resistance = Weather, Gasoline, Motor Oil, Moisture, Jet Fuel, Hydrocarbon, Hydraulic Fluid
• Usage = Adhesives
• Physical Form = Paste

Peel strength tested according to ASTM D1876-61P.|Resistance tested by immersion of bonded steel lap joints for 2 weeks in antifreeze, jet fuel, 10% and 50% sulfuric acid, and 10% and 20% potassium hydroxide, and by immersion for 2 months in gasoline at 72 øF.|Shear strength tested according to ASTM D1002.|Compression shear strength tested according to ASTM D3931.|Impact resistance tested according to ASTM D950.
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50ml. Dev Pack Plastic Welder Category: Epoxy

Demonstration of bumper repair using a hot air welder.

• Excellent UV/IR protection
• Sturdy plastic frame
• Available in a variety of shades
• Glass Lenses

Product Description
This lens is a green in color. The spectral response of this glass shows excellent ultraviolet and infrared protection. The visible light transmission will depend on the chosen shade. The higher the number the darker the glasses. The filter DOES NOT pr

QUARTZWORKING GLASS SPECTACLES IN PLASTIC SAFETY FRAME 50mm EYE SIZE – SHADE #8 WELDERS LENS

• Dimensions: 14ft. x 12.25in. x 4.5in. (36cm x 31cm x 11cm)
• Electrical: 115V/60 Hz (240V/50 Hz available on special order)
• Features durable 80 watt heating element
• Portable temperature control unit with belt clip for freedom of movement

Product Description
The most popular plastic welder in the automotive repair industry. The Mini-Weld Model 6 is ideal for making quality repairs to virtually any type of plastic. Problem plastics like PP and PE are easy to repair using the included FiberFlex stick and polyethylene welding rods. Includes eight types of welding rod for repairing cracked bumpers, underhood and interior plastics, ATVs, canoes, kayaks, motorcycles, aviation and marine plastics, and many industrial and agricultural plastics. The 80 watt heating element achieves tip temperatures of about 1000deg F for fast and easy welding. Included stainless steel reinforcing wire mesh can make the repair stronger than the original! Includes instructional DVD that shows you how to use the tool. Packaged in a custom-molded plastic case for easy storage and transport. USA.

Urethane Supply Co. Mini-Weld Model 6 Airless Plastic Welder, Model# 5600HT