What are the chemical properties of HDPE?
Flexible, translucent/waxy, weatherproof, good low temperature toughness (to -60’C), easy to process by most methods, low cost, good chemical resistance….HDPE Properties:
| HDPE Physical Properties: | Value: |
|---|---|
| Max. Continued Use Temperature: | 65 oC (149 oF) |
| Melting Point: | 126 oC (259 oF) |
| Density: | 0.941 – 0.965 g/cm3 |
Why is HDPE inert?
HDPE has less side branching than LDPE resulting in a denser 3-D structure. As a result, HDPE is less flexible than LDPE and melts at a higher temperature (120°C). Like other polyolefins, HDPE is chemically inert. Strong oxidizing agents will eventually cause oxidation and embrittlement.
Why is polyethylene so stable?
Because of their symmetric molecular structure, they tend to crystallize; overall polyethylene is partially crystalline. Higher crystallinity increases density and mechanical and chemical stability.
Can you autoclave HDPE?
HDPE is not autoclavable, even though the maximum use temperature (120°C) is very close to the typical autoclave temperature (121°C). Many Nalgene products have the material identification molded into the product to help you determine the material of construction.
Is HDPE chemical resistant?
In general terms, high density polyethylene is more chemical resistant than low density.
Is HDPE UV resistant?
HDPE is one of the world’s most commonly used plastics, is incredibly safe, it emits no harmful emissions, and does not absorb moisture. Typical characteristics of this HDPE material: UV resistance. Good fatigue & wear resistance.
Is HDPE hydrophobic?
However, a problem associated with HDPE is that it has a partially hydrophobic surface, due to its low surface energy and lack of functional groups, resulting in limited adhesion and low chemical reactivity [6–8].
How is plastic sterilized?
Steam Sterilization, also known as autoclaving, involves generating or injecting saturated steam into a pressure chamber at a temperature range of 121-148 °C (250-300 °F) at 15psi for a period of time sufficient to provide sterilization. Some plastics are degraded by autoclaving.
Why is HDPE chemical resistant?
Due to its non-polar nature, the polyethylene resins (PEs) have an exceptionally high resistance to chemicals and other media. It is not affected by aqueous solutions of salts, acids and alkalis. Up to 600C, PEs are resistant to many solvents.
What temperature can HDPE withstand?
The difference in strength exceeds the difference in density, giving HDPE a higher specific strength. It is also harder and more opaque and can withstand somewhat higher temperatures (120 °C/248 °F for short periods).
Is HDPE weather resistant?
ADVANTAGES High Density Polyethylene is somewhat harder and more opaque than LDPE (Low Density Polyethylene) and it can withstand rather higher temperatures (120° Celsius for short periods, 110° Celsius continuously).