High Density Polypropylene (HDPP)
High density polypropylene (HDPP), also called polypropene is a thermoplastic polymer, made up of the monomer, propylene. It can be manufactured as a dense product that has high resistance to chemical cleansers but also relatively light and flexible with a low melting point between 130 and 170 degrees C.
Polypropylene (PP) is a commonly used material for packaging, automotive parts and textiles, whilst HDPP is commonly used to manufacture pipes as an alternative to high density polyethylene (HDPE). HDPE is naturally greater resistance to UV but HDPP can contain additives that increases its UV stability. HDPP can become more brittle at lower temperatures and poorer resistance to oils than HDPE.
Polypropylene (PP) including High density polypropylene (HDPP) comes under category 5 in the Resin Identification Code (RIC) system for plastic classification, where as high density polyethylene (HDPE) falls in category 2. To differentiate between the two under a burn test ,HDPP tends to smell of petroleum whilst HDPE smells more of melted candlewax.
[edit] Related articles on Designing Buildings
- Adhesives.
- Construction plastics market.
- ETFE.
- High density polyethylene (HDPE).
- Glass reinforced plastic GRP.
- Plasticisation.
- Plastic in construction.
- Plastic and recycling.
- Polyethylene.
- Polymers.
- Recyclable construction materials.
- Rubber.
- Thermoplastic materials in buildings.
- Transparent insulation materials.
- Types of plastic.
- Weatherboarding.
Featured articles and news
Registered building inspectors
Building types and conflicts of interest updates explaineed.
Engineering services still struggle with labour shortages
According to latest quarterly services survey of the sector.
Infrastructure that connect the physical and digital domains.
Harnessing robotics and AI in challenging environments
The key to nuclear decommissioning and fusion engineering.
BSRIA announces Lisa Ashworth as new CEO
Tasked with furthering BSRIA’s impressive growth ambitions.
Public buildings get half a million energy efficiency boost
£557 million to switch to cleaner heating and save on energy.
CIOB launches pre-election manifesto
Outlining potential future policies for the next government.
Grenfell Tower Inquiry announcement
Phase 2 hearings come to a close and the final report due in September.
Progress from Parts L, F and O: A whitepaper, one year on.
A replicated study to understand the opinion of practitioners.
ECA announces new president 2024
Electrical engineer and business leader Stuart Smith.
A distinct type of countryside that should be celebrated.
Should Part O be extended to existing buildings?
EAC brands heatwave adaptation a missed opportunity.
Definition of Statutory in workplace and facilities management
Established by IWFM, BESA, CIBSE and BSRIA.
Tackling the transition from traditional heating systems
59% lack the necessary information and confidence to switch.
The general election and the construction industry
As PM, Rishi Sunak announces July 4 date for an election.
Eco apprenticeships continue help grow green workforce
A year after being recognised at the King's coronation.