Zincalum Flat Sheet Made of aluminum, zinc and silicon, Zincalume steel is a durable metal. With a service life nearly four times that of galvanized steel, Zincalume steel has been designed as a product built to last. This not only ensures lifetime savings for property owners, but also reduces the environmental problems associated with replacing building materials. Zincalume is available in the sizes and thicknesses listed, if you require a different size, contact Harijaya Insulation Surabaya and we will try to find the material you need.