High-Density Polyethylene, usually shortened to PEX-AL-PEX pipe, is actually a plastic polymer with flexible properties that make it suitable for a variety of applications.
High-density polyethylene, as the name suggests, carries a higher specific density than low-density polyethylene, though this difference is simply marginal. What really definitely makes the difference from the physical properties of HDPE is lacking branching, meaning it can be light having a high tensile strength. Since there is no branching the structure is much more closely packed, make HDPE a linear polymer. The branching may be controlled and reduced by using specific catalysts during production.
HDPE has numerous advantageous properties making it important in the manufacturing of various products. HDPE has a comparatively high density when compared with other polymers, by using a specific gravity of .95. HDPE is fairly hard and resistant to impact and might be subjected to temperatures up to 120oC without being affected.
These durable properties help it become ideal for durable containers and HDPE is primarily utilized for milk containers, and also Tupperware, shampoo bottles, bleach bottles and motor oil bottles. Also, HDPE fails to absorb liquid readily, which makes it good barrier material for liquid containers. Almost another (about eight million tons) of HDPE produced worldwide is used for these types of containers.
Furthermore HDPE is an extremely resistant material to many people chemicals, hence it widespread utilization in healthcare and laboratory environments. It is actually resistant to many acids, alcohols, aldehydes, esters, bases and oils.
HDPE is accepted at most recycling centres on the planet, as it is among the easiest plastic polymers to recycle. Most recycling companies will collect HDPE products and take those to large facilities to become processed.
First, the plastic is sorted and cleaned, to take out any unwanted debris. The plastic then needs to homogenised, in order that only HDPE will likely be processed. If there are many plastic polymers inside the batch, this may ruin the recycled end-product.
HDPE has a specific density of .93 to .97 g/cm3. This really is reduced compared to PET which happens to be 1.43-1.45 g/cm3, which means that these plastic polymers could be separated by making use of sink-float separation. However, HDPE pipe fittings carries a similar specific density to PP, which suggests the sink-float separation cannot be used. In such a case, Near Infrared Radiation (NIR) techniques works extremely well, unless the plastic is 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 going to be cooled into pellets that may be found in manufacturing.
Recycling plants can also benefit from the use of a baler, which can compress the post-consumer waste to minimise energy utilized in transport.
Small steps at home can also be taken up 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 great choice.
Equally, carrier bags can be reused when going shopping. Many large supermarkets provide collection points for used carrier bags to get recycled. Some plastic films contain a message to recycle these with carrier bags on the supermarket and never to depart ‘kerbside’.
Recycling of HDPE is aided through the resin code around the product, which can be an indiscriminate number allotted to different plastic polymers to assist separate plastics at the recycling stage. The resin identification code for top-density polyethylene is ‘2’.
The Environmental Advantages of Recycling HDPE
The worldwide industry for HDPE is large, having a market level of around 30million tons a year.
The level of plastic found in plastic bags has reduced by around 70% in the last 2 decades because of the introduction of reusable canvas bags and taking advantage of biodegradable materials, but dexqpkyy02 most of bags will still be created from PEX-AL-PEX pipe. Furthermore, you will find a growing market for HDPE containers in China and India because of increased standards of just living, together with a higher need for HDPE pipes and cables due to rapidly growing industries.
HDPE is non-biodegradable and may take centuries to decompose, so it is imperative these particular bags and containers are recycled and used again.
Recycling HDPE has lots of benefits. As an example, it is actually more cost efficient to make a product from recycled HDPE than it is to produce ‘virgin’ plastic.
HDPE, like many plastic polymers, is produced using considerable quantities of non-renewable fuels and yes it has a total of 1.75kg of oil to manufacture just 1kg of HDPE.