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Mapescreed Foamer L is a high-performance liquid foaming agent, based on an anionic biodegradable surfactant combined with a natural polymer with lubricating action. Mapescreed Foamer L is completely formulated with glycol-free and biodegradable raw materials. It is suitable to produce lightweight screeds in contact with bituminous membranes. Mapescreed Foamer L generates a stable foam over time, with excellent lubricating properties., suitable for producing lightweight, heat-insulating screeds with various densities. The presence of the polymer combined with the foaming agent increases the half-life of the foam and improves its lubricity. Mapescreed Foamer L reduces the water demand in the mix, improves the mechanical strength and the stability of the foam even with high thickness.