High-Density Polyethylene, usually shortened to PEX-AL-PEX pipe, is a plastic polymer with flexible properties that make it well suited for a wide array of applications.
High-density polyethylene, as the name suggests, carries a higher specific density than low-density polyethylene, though this difference is only marginal. What really helps make the difference within the physical properties of HDPE is the lack of branching, meaning it is actually light with a high tensile strength. As there is no branching the dwelling is much more closely packed, make HDPE a linear polymer. The branching can be controlled and reduced through the use of specific catalysts during production.
HDPE has numerous advantageous properties that make it essential in the manufacturing of various products. HDPE features a comparatively high density when compared with other polymers, using a specific gravity of .95. HDPE is pretty hard and proof against impact and can be subjected to temperatures as high as 120oC without having to be affected.
These durable properties ensure it is ideal for durable containers and HDPE is primarily used for milk containers, in addition to Tupperware, shampoo bottles, bleach bottles and motor oil bottles. Also, HDPE is not going to absorb liquid readily, making it good barrier material for liquid containers. Almost another (about eight million tons) of HDPE produced worldwide is used for these sorts of containers.
Furthermore HDPE is definitely a resistant material to many people chemicals, hence it widespread utilization in healthcare and laboratory environments. It is actually proof against many acids, alcohols, aldehydes, esters, bases and oils.
HDPE is accepted at most of the recycling centres on earth, since it is among the easiest plastic polymers to recycle. Most recycling companies will collect HDPE products and take those to large facilities to be processed.
First, the plastic is sorted and cleaned, to eliminate any unwanted debris. The plastic then needs to homogenised, to ensure that only HDPE will be processed. If there are additional plastic polymers within the batch, this could ruin the recycled end-product.
HDPE has a specific density of .93 to .97 g/cm3. This can be far lower than that of PET which is 1.43-1.45 g/cm3, which means that these plastic polymers may be separated by utilizing sink-float separation. However, HDPE pipe fittings has a similar specific density to PP, which suggests the sink-float separation can not be used. In this instance, Near Infrared Radiation (NIR) techniques may be used, unless the plastic is just too dark and absorbs the infrared waves.
HDPE is then shredded and melted to further refine the polymer. The plastic is then cooled into pellets that may be employed in manufacturing.
Recycling plants could also reap the benefits of the use of a baler, which could compress the post-consumer waste to minimise energy employed in transport.
Small steps in your house can be come to recycle HDPE. Regarding milk bottles, these could be reused if washed out thoroughly first. To minimize packaging waste, buying plastic bottles in mass is another wise decision.
Equally, carrier bags can also be reused when going shopping. Many large supermarkets also provide collection points for used carrier bags to be recycled. Some plastic films consist of a message to recycle these with carrier bags with the supermarket rather than to depart ‘kerbside’.
Recycling of HDPE is aided through the resin code in the product, which happens to be an indiscriminate number assigned to different plastic polymers to aid separate plastics with the recycling stage. The resin identification code for high-density polyethylene is ‘2’.
The Environmental Benefits associated with Recycling HDPE
The worldwide niche for HDPE is large, having a market volume of around 30million tons per year.
The amount of plastic employed in plastic bags has reduced by around 70% over the last two decades on account of the introduction of reusable canvas bags and making use of biodegradable materials, but dexqpkyy02 largest part of bags are still made out of PEX-AL-PEX pipe. Furthermore, there is a growing market for HDPE containers in China and India as a result of increased standards of living, in addition to a higher interest in HDPE pipes and cables due to rapidly growing industries.
HDPE is non-biodegradable and will take centuries to decompose, so it is imperative these particular bags and containers are recycled and used again.
Recycling HDPE has many benefits. By way of example, it can be more cost effective to make a product from recycled HDPE than to produce ‘virgin’ plastic.
HDPE, like many plastic polymers, is produced using considerable levels of standard fuels and yes it needs a total of 1.75kg of oil to produce just 1kg of HDPE.