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
Amendment to the GB Energy Bill welcomed by ECA
Move prevents nationally-owned energy company from investing in solar panels produced by modern slavery.
Gregor Harvie argues that AI is state-sanctioned theft of IP.
Heat pumps, vehicle chargers and heating appliances must be sold with smart functionality.
Experimental AI housing target help for councils
Experimental AI could help councils meet housing targets by digitising records.
New-style degrees set for reformed ARB accreditation
Following the ARB Tomorrow's Architects competency outcomes for Architects.
BSRIA Occupant Wellbeing survey BOW
Occupant satisfaction and wellbeing tool inc. physical environment, indoor facilities, functionality and accessibility.
Preserving, waterproofing and decorating buildings.
Many resources for visitors aswell as new features for members.
Using technology to empower communities
The Community data platform; capturing the DNA of a place and fostering participation, for better design.
Heat pump and wind turbine sound calculations for PDRs
MCS publish updated sound calculation standards for permitted development installations.
Homes England creates largest housing-led site in the North
Successful, 34 hectare land acquisition with the residential allocation now completed.
Scottish apprenticeship training proposals
General support although better accountability and transparency is sought.
The history of building regulations
A story of belated action in response to crisis.
Moisture, fire safety and emerging trends in living walls
How wet is your wall?
Current policy explained and newly published consultation by the UK and Welsh Governments.
British architecture 1919–39. Book review.
Conservation of listed prefabs in Moseley.
Energy industry calls for urgent reform.