Galvalume
Galvalume (GL) is a kind coating consisting of of 43.4% zinc, 1.6% silicon, and 55% aluminium that performs the role of protecting metals from oxidation.
Advantages:
- Excellent resistance to corrosion. The corrosion resistance of galvalume products is mainly associated with the protective functions of aluminium. When the zinc starts to degrade, the aluminium will form a thick alumina layer which prevents further corrosion of the materials inside. Its corrosion resistance is 3 times that of galvanized sheet.
- High heat reflectivity. The thermal reflectivity of GL sheet is very high, twice that of galvanized steel sheet, and it is often used as a thermal insulation material. roofing sheet is suitable for hot climates.
- Heat resistance. Galvalume steel has impressive heat resistance that will withstand temperatures that exceed 300 degrees , so it is often used in chimney pipes, ovens, luminaires, and fluorescent lampshades.
- Appearance: The surface of the GL steel sheet is smooth with beautiful and uniform spangles, and the base colour is silver white, so it can be used as cladding.
- GL coating has good adhesion to paint film so it can be the substrate for PPGL (pre-painted galvalume) steel.
- It has good processing performance and can be punched, sheared, welded, etc. for other uses.
Disadvantages:
- High cost: GL coil is more expensive than galvanized, HR and CR coils.
- Thickness: The option of coating thickness and coil thickness is limited. The sheet thickness ranges between 0.2-4mm generally.
- Not-suited for livestock facilities: GL coil is widely used in building materials, household appliances, automobiles, machinery, ships and so on. But it should not be used for animal confinement spaces. Galvalume coil will corrode faster than galvanized metal when exposed to animal urine.
Store GL steel coils and sheets indoors and keep the storage area dry and ventilated. Do not store it for a long time in an acidic environment. When storing outdoors, protect from rain and avoid condensation
To avoid external impact in transport use a skid to support steel coils to reduce stacking and protect from moisture.
[edit] Related articles on Designing Buildings
Featured articles and news
The 2024 update of the Common Assessment Standard
Demonstrating organisational capability’ to fulfil roles under the Building Safety Act.
The story behind the award-winning knowledge quarter building,
SkillELECTRIC Top 8 Competitors Named
in annual search for the UK’s best student electrician.
CIOB Diversity and Inclusion technical Information sheet
Step-by-step guide on implementing D and I practices.
Conservation and the Indian City. Book review.
Reversibility in conservation ethics
Learning from painting conservation.
Where It's AT Podcast launched!
New CIAT Architectural Technology Podcast goes live.
The holistic approach to understanding buildings, their defects and associated remedial action.
Housing Ombudsman raises urgent concerns
About window-related complaints in social housing.
Maintaining and refurbishing PVCu windows
Getting more from old windows that can't be replaced.
The global market for Air Conditioning
Potential growth in Latin America despite challenges ahead.
The Welded Masonry Support (WMS) IG Masonry Support
The first masonry support manufacturer to receive Passive House certification.
Anonymous and safe reporting service to stop meter tampering.
Planning approvals increased by twenty percent in June
Ahead of new housebuilding drive by Labour government.
Tech advances, regulatory standards, but a global demand.
Refrigeration market updates on condensing units.
The National Retrofit Hub at a one year milestone
Four key NRH resources now available.
New built environment degree apprenticeships for Wales
Supporting the need for an extra 11,000 workers by 2028.