Plasterfine Expanded Perlite: 0-0.5mm (14kg bag) P200 Expanded Perlite: 0-1mm (5kg/100L bag) M200 Expanded Perlite: 1-3mm (10kg/100L bag) P400 Expanded Perlite: 0-4mm (10kg/100L bag) P500 Expanded Perlite: 1-5mm (10kg/100L bag) Perlite is the generic name for naturally occurring siliceous volcanic rock. AUSPERL is pleased to offer various grades of perlite ore from which expanded perlite products are produced. We operate our own quarry, in the central North Island of New Zealand as well as importing perliteore for specific applications from Turkey, Greece and the USA. The expansion process is caused by the presence of water in the crude rock. When perlite ore is rapidly heated to above 850°c this water vaporises and causes the softened rock to expand. Tiny glass-like bubbles are produced which account for the lightweight and exceptional physical properties of expanded perlite.
