High-Density Polyethylene, usually shortened to HDPE pipe fittings, is a plastic polymer with flexible properties which can make it ideal for an array of applications.
High-density polyethylene, as the name suggests, features a higher specific density than low-density polyethylene, though this difference is simply marginal. What really helps make the difference within the physical properties of HDPE is lacking branching, meaning it really is light having a high tensile strength. Because there is no branching the dwelling is much more closely packed, make HDPE a linear polymer. The branching might be controlled and reduced by using specific catalysts during production.
HDPE has many advantageous properties that make it essential in the manufacturing of various products. HDPE carries a comparatively high density in comparison to other polymers, having a specific gravity of .95. HDPE is comparatively hard and immune to impact and will be exposed to temperatures of up to 120oC without having to be affected.
These durable properties allow it to be perfect for heavy-duty containers and HDPE is primarily useful for milk containers, along with Tupperware, shampoo bottles, bleach bottles and motor oil bottles. Also, HDPE fails to absorb liquid readily, making it good barrier material for liquid containers. Almost a third (about eight million tons) of HDPE produced worldwide is commonly used for these sorts of containers.
Furthermore HDPE is definitely a resistant material to many chemicals, hence it widespread utilize in healthcare and laboratory environments. It can be resistant to many acids, alcohols, aldehydes, esters, bases and oils.
HDPE is accepted at most recycling centres worldwide, because 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 eliminate any unwanted debris. The plastic then has to homogenised, to ensure that only HDPE will be processed. If there are other plastic polymers from the batch, this may ruin the recycled end-product.
HDPE carries a specific density of .93 to .97 g/cm3. This is certainly much lower compared to PET which is 1.43-1.45 g/cm3, which means that these plastic polymers could be separated through the use of sink-float separation. However, HDPE pipe fittings carries a similar specific density to PP, meaning the sink-float separation cannot be used. In such a case, Near Infrared Radiation (NIR) techniques works extremely well, unless the plastic is way too dark and absorbs the infrared waves.
HDPE is going to be shredded and melted to further refine the polymer. The plastic is going to be cooled into pellets which can be used in manufacturing.
Recycling plants could also take advantage of using a baler, which could compress the post-consumer waste to minimise energy used in transport.
Small steps at home can also be come to recycle HDPE. With regards to milk bottles, these can easily be reused if washed out thoroughly first. To reduce packaging waste, buying plastic containers in bulk is another wise decision.
Equally, carrier bags can be reused when going shopping. Many large supermarkets also provide collection points for used carrier bags to become recycled. Some plastic films contain a message to recycle these with carrier bags at the supermarket and not to go out of ‘kerbside’.
Recycling of HDPE is aided from the resin code about the product, that is an indiscriminate number assigned to different plastic polymers to help you separate plastics at the recycling stage. The resin identification code for high-density polyethylene is ‘2’.
The Environmental Benefits of Recycling HDPE
The worldwide marketplace for HDPE is large, having a market level of around 30million tons per year.
The quantity of plastic employed in plastic bags has reduced by around 70% within the last 2 decades on account of the introduction of reusable canvas bags and making use of biodegradable materials, but dexqpky02 largest part of bags remain created from PEX-AL-PEX pipe. Furthermore, you will discover a growing industry 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, it is therefore imperative these particular bags and containers are recycled and used again.
Recycling HDPE has many benefits. For example, it is more cost efficient to generate a product from recycled HDPE than it is to manufacture ‘virgin’ plastic.
HDPE, like many plastic polymers, is produced using considerable levels of standard fuels plus it requires a total of 1.75kg of oil to produce just 1kg of HDPE.