Polypropylene in the construction industry
Contents |
[edit] Introduction
Polypropylene (PP, also known as polypropene or polymerised propene) is a type of thermoplastic polymer resin that has similar qualities to polyethylene (PE) but is slightly harder and has better resistance to heat and organic solvents. After PE, polypropylene is the second-most widely produced commodity plastic with a global market (2013) of around 55 million tonnes.
A member of the polyolefin family of resins, PP can be injection moulded and extruded into many shapes and products such as cups, cutlery, containers, housewares and car parts e.g batteries. It is also spun into fibres for inclusion in industrial and domestic textiles, including for clothing.
As a plastic it is extremely versatile and found in common household items and used in both commercial and industrial applications.
[edit] Properties
- Lightweight, tough and flexible
- Heat resistant (high melting point (around 160°C) – used in microwaves, dishwashers, food containers
- Chemically inert
- Impact and freeze-resistant
- High shatter resistance
- Low moisture absorption
- Mould resistant
- Low density allows lower-weight mouldings to be made
- Resistant to fats and organic solvents
- Accepts colour and dye without degrading
- Reasonably inexpensive
- Does not contain BPA (bisphenol A - which some claim can leach into food products)
- Fatigue resistance – allows use as a plastic hinge
- It can float in water
[edit] Typical applications
It has a large number of end-use applications in the construction industry due to the wide range of grades available and the use of additives to modify properties:
- PP fibres are added to concrete to increase strength and reduce cracking and spalling
- Non-woven fabrics for ground stabilisation
- Roofing membranes (waterproofing top-layer in single-ply systems)
- Reinforcement in construction and road paving
- Electrical cable insulation (alternative to PVC)
- Piping systems
- Carpets, rugs and upholstery
- Medical and laboratory equipment
- Reusable containers
- Plastic machine parts
- Industrial rope and cordage
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
For the World Autism Awareness Month of April.
70+ experts appointed to public sector fire safety framework
The Fire Safety (FS2) Framework from LHC Procurement.
Project and programme management codes of practice
CIOB publications for built environment professionals.
Sustainable development concepts decade by decade.
The regenerative structural engineer
A call for design that will repair the natural world.
Buildings that mimic the restorative aspects found in nature.
CIAT publishes Principal Designer Competency Framework
For those considering applying for registration as a PD.
BSRIA Building Reg's guidance: The second staircase
An overview focusing on aspects which most affect the building services industry.
Design codes and pattern books
Harmonious proportions and golden sections.
Introducing or next Guest Editor Arun Baybars
Practising architect and design panel review member.
Quick summary by size, shape, test, material, use or bonding.
Types of rapidly renewable content
From forestry to agricultural crops and their by-products.
Terraced houses and the public realm
The discernible difference between the public realm of detached housing and of terraced housing.