Graded density particle board
Graded density particle board is based on the same principle as three-layer particle board, just with coarser particles to the outer edges and a softwood centre. It makes a denser product than standard particle boards but lighter than three-layer particle boards, which is likely to have higher levels of resin.
Standard particle board was originally made in late 19th century Germany, then produced commercially around the Second World War. The earlier board products were often made using blood albumin glue, whilst later commercial products used phenolic resins, amino formaldehyde-, urea formaldehyde-, or urea melamine-based, today there are also particle board products that use glues with lesser environmental impacts. Graded density as well as three-layer particle boards were introduced some time later, as a method to reduce the volumes of glue and wood used, whilst retaining similar characteristics with a lighter board.
All particle boards comprise of a small chips and flakes of softwood of varying sizes and density that are impregnated with adhesive (usually amino formaldehyde-, urea formaldehyde-, or urea melamine-based) and subjected to high temperature(up to 220°C) and pressure (2-4MP). When cooled, the boards are cut and sanded, sold either as plain board or faced with laminate.
[edit] Related articles on Designing Buildings
- Adhesives.
- Blockboard.
- Cedar.
- Chipboard.
- Confederation of Timber Industries.
- Cross-laminated timber.
- Engineered bamboo.
- Glulam.
- Hardboard.
- Laminated veneer lumber LVL.
- Lime wood.
- Low-density fibreboard LDF.
- Medium density fibreboard - MDF.
- Modified wood.
- Oriented strand board.
- Particle board.
- Plywood.
- Single-layer particle board.
- Softwood.
- Timber.
- Timber construction for London.
- Timber preservation.
- Timber vs wood.
- Types of timber.
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.