Film Stripping Device

The Film Stripping Device (Stripping Value Apparatus) is used to assess the affinity between a bituminous binder and an aggregate — specifically the resistance of the bitumen coating to being stripped off the aggregate surface in the presence of water. Coated aggregate specimens are immersed in distilled water in a beaker or jar and placed on the device, which applies gentle, uniform agitation for a specified period; the extent of coating retained on the aggregate is then visually assessed and expressed as a stripping value, indicating the suitability of the aggregate-bitumen combination for pavement use. For determining the resistance of bituminous mixture to stripping of the asphalt from aggregate particles and for examining the adhesive capacity of bituminous material. Applied to aggregate fraction passing 9.525 mm sieve and retained on No.8 Sieve.

It consists of a disc on which four bottles are mounted. The disc rotates at a rate of 100 r.p.m. approx. The sample is kept in bottles and agitated for 15 minutes. The percentage of aggregate stripped is estimated by visual observation. Provided with a time switch.Suitable for operation on 220 V, 50 Hz, sin-gle phase supply.