Abstract: Disclosed is a sealing composition for treating a metal substrate comprising: a polyolefin component; and a colloidal layered silicate. Also disclosed is a system for treating a metal substrate comprising: a cleaner composition; and/or a pretreatment composition for treating at least a portion of the substrate, the pretreatment composition comprising a Group IVB metal; and a sealing composition for treating at least a portion of the substrate treated with the cleaner composition and/or the pretreated composition, the sealing composition comprising a polyolefin component. Also disclosed is a method of treating a substrate comprising contacting at least a portion of a surface of the substrate with any of the compositions disclosed herein or any of the systems disclosed herein.

Abstract: A pipeline inspection vehicle comprises a main body (10) driven through a pipeline by fluid flow against resilient cups (12). Resilient fingers (20) carry a circumferential array of magnetic proximity sensors for sensing the spacing between each sensor and the metal of the pipeline wall. Wheels (18) biased into engagement with the pipeline wall provide one form of distance measurement. The vehicle has on-board data storage by way of a memory housed within a pressure vessel.

Abstract: A treated inorganic solid comprises particulate inorganic material the particles of which are coated with an alkylphosphonic acid or ester thereof, the alkylphosphonic acid containing 6 to 22 carbon atoms. The particulate material is usually a pigment, extender or filler which is treated by mixing with the alkylphosphonic acid or ester for example in an aqueous dispersion or during a process step such as milling. The treated inorganic solid is particularly useful for preparing polymer compositions such as masterbatches.