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Bitumen
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=== Mastic asphalt === [[Mastic asphalt]] is a type of asphalt that differs from dense graded asphalt ([[asphalt concrete]]) in that it has a higher bitumen ([[binder (material)|binder]]) content, usually around 7β10% of the whole aggregate mix, as opposed to rolled asphalt concrete, which has only around 5% asphalt. This thermoplastic substance is widely used in the building industry for waterproofing flat roofs and tanking underground. Mastic asphalt is heated to a temperature of {{convert|210|Β°C|Β°F}} and is spread in layers to form an impervious barrier about {{convert|20|mm|in|1|abbr=off|sp=us}} thick.
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