What is medium density polyethylene used for?
MDPE is typically used in gas pipes and fittings, sacks, shrink film, packaging film, carrier bags, and screw closures. In the United Kingdom, black (or blue) MDPE is often used for water and waste water plumbing, and may also be referred to as ‘black alkathene. ‘
What is the difference between HDPE and LDPE?
LDPE is softer and more flexible than HDPE. It also has a lower melting point (115° C) and is more transparent. Compared to HDPE, it is more likely to crack under stress. HDPE is rigid and durable and offers greater chemical resistance.
What is high density polyethylene packaging?
HDPE packaging is a plastic with many applications in packaging due to its unique blend of properties. It is a hydrocarbon polymer created in a catalytic process that results in a final product containing a number of beneficial properties, including a high tensile strength, that complement many packaging needs.
Is medium density polyethylene Food Safe?
Polyethylene Terephthalate (PET) Specially-treated PET containers are microwaveable and used in take-out containers and single-serving food trays. The FDA has approved both virgin and post-consumer recycled (PCR) PET for food contact.
What are the advantages of using transparent medium density polyethylene?
Advantages. Good shock and drop resistance. Less notch sensitive than HDPE, stress cracking resistance is better than HDPE.
Which is stronger LDPE or HDPE?
HDPE has higher abrasion and tear resistance than LDPE, along with higher tensile and shear strength.
Why HDPE has higher density than LDPE?
HDPE’s structure is crystalline. HDPE’s formidable structure gives it a higher density than LDPE. The forces of attraction between polymer molecules are strong.
What is the water absorption of high density polyethylene HDPE?
Water Absorption Values of Several Plastics
| Polymer Name | Min Value (% weight) | Max Value (% weight) |
|---|---|---|
| HDPE – High Density Polyethylene | 0.005 | 0.01 |
| HIPS – High Impact Polystyrene | 0.05 | 0.15 |
| HIPS Flame Retardant V0 | 0.05 | 0.10 |
| Ionomer (Ethylene-Methyl Acrylate Copolymer) | 0.01 | 0.01 |
Is HDPE plastic BPA free?
High-density polyethylene (HDPE) is, like BPA, a material derived from petroleum. The difference is that HDPE plastics are completely free from BPA and are therefore safe for applications that directly impact humans.
Is high density polyethylene cheap?
It’s Cheap! HDPE not only has all of these great properties, but it is low cost as well, as it is so commonly available and used in many different industries.