High-Density Polyethylene, usually shortened to HDPE pipe fittings, can be a plastic polymer with flexible properties which make it suitable for a wide range of applications.
High-density polyethylene, as the name suggests, features a higher specific density than low-density polyethylene, though this difference is only marginal. What really helps to make the difference from the physical properties of HDPE is the possible lack of branching, meaning it is actually light by using a high tensile strength. Because there is no branching the dwelling is more closely packed, make HDPE a linear polymer. The branching might be controlled and reduced through the use of specific catalysts during production.
HDPE has many advantageous properties which render it important in the manufacturing of numerous products. HDPE features a comparatively high density when compared with other polymers, with a specific gravity of .95. HDPE is comparatively hard and resistant to impact and may be put through temperatures as high as 120oC without being affected.
These durable properties ensure it is perfect for heavy duty containers and HDPE is primarily used for milk containers, in addition to Tupperware, shampoo bottles, bleach bottles and motor oil bottles. Also, HDPE does not absorb liquid readily, which makes it good barrier material for liquid containers. Almost one third (about eight million tons) of HDPE produced worldwide is used for these kinds of containers.
Furthermore HDPE is definitely a resistant material to numerous chemicals, hence it widespread use in healthcare and laboratory environments. It can be immune to many acids, alcohols, aldehydes, esters, bases and oils.
HDPE is accepted at most recycling centres worldwide, since it is among the easiest plastic polymers to recycle. Most recycling companies will collect HDPE products and take those to large facilities to get processed.
First, the plastic is sorted and cleaned, to take out any unwanted debris. The plastic then should homogenised, so that only HDPE will probably be processed. If there are more plastic polymers in the batch, this could ruin the recycled end-product.
HDPE includes a specific density of .93 to .97 g/cm3. This really is far lower than that of PET which can be 1.43-1.45 g/cm3, which means these plastic polymers could be separated by using sink-float separation. However, HDPE pipe fittings carries a similar specific density to PP, which implies the sink-float separation can not be used. In this case, Near Infrared Radiation (NIR) techniques can be used, unless the plastic is just too dark and absorbs the infrared waves.
HDPE is going to be shredded and melted right down to further refine the polymer. The plastic is then cooled into pellets which is often utilized in manufacturing.
Recycling plants also can benefit from utilizing a baler, which could compress the post-consumer waste to minimise energy employed in transport.
Small steps in your house may also be taken up recycle HDPE. Regarding milk bottles, these could be reused if washed out thoroughly first. To lower packaging waste, buying plastic bottles in large quantities is yet another great option.
Equally, carrier bags can be reused when going shopping. Many large supermarkets also offer collection points for used carrier bags to become recycled. Some plastic films contain a message to recycle these with carrier bags at the supermarket rather than to leave ‘kerbside’.
Recycling of HDPE is aided by the resin code in the product, which is an indiscriminate number assigned to different plastic polymers to assist separate plastics in the recycling stage. The resin identification code for top-density polyethylene is ‘2’.
The Environmental Benefits of Recycling HDPE
The worldwide niche for HDPE is big, with a market number of around 30million tons a year.
The amount of plastic found in plastic bags has reduced by around 70% within the last 2 decades because of the introduction of reusable canvas bags and using biodegradable materials, but dexqpkyy02 largest part of bags remain created from PEX-AL-PEX pipe. Furthermore, there is a growing marketplace for HDPE containers in China and India because of increased standards of living, together with a higher need for HDPE pipes and cables because of rapidly growing industries.
HDPE is non-biodegradable and can take centuries to decompose, therefore it is imperative these bags and containers are recycled and used again.
Recycling HDPE has lots of benefits. As an example, it is actually more inexpensive to produce a product from recycled HDPE than it is to manufacture ‘virgin’ plastic.
HDPE, like many plastic polymers, is produced using considerable numbers of standard fuels and it also needs a total of 1.75kg of oil to produce just 1kg of HDPE.