BS 3416: 1988 pdf download.Bitumen-based coatings for cold application,suitable for use in contact with potable water.
1 Scope This British Standard specifies performance and marking requirements for a range of bitumen-based solvent-borne coatings. It covers coatings for cold application by either brushing, spraying, rolling or dipping processes intended to give a coat for the corrosion protection and water- proofing of substrates including iron and steel. Two types, each with three classes, are included. All of these give films that are suitable for use on potable water tanks and cisterns as well as for general applications. The level of gloss of the finished film is not specified in this British Standard. NOTE 1. These bitumen coatings are neither intended to withstand hot conditions, 8 on boilers, smoke stacks, etc., for which special coatings should bo obtained, nor to resist contamination with mlneral olls or paint solvents, all of which conditions will ciuse softening of the film. NOTE 2. Guidance on the use of bitumen based coatings is given in appendix A, BS 5493 and BS 6150. NOTE 3. The titls of the publcations referred to in this standurd are listed on the inside back cover.
2 Definitions For the purposes of this British Standard, the definitions given in BS 2015 apply together with the following.
2.1 bitumen. A viscous liquid, or a solid, consisting essentially of hydrocarbons and their derivatives, which is soluble in trichloroethylene and is substantially non-volatile and softens gradually when heated. It is black or brown in colour and possesses waterproofing and adhesive properties. It is obtained by refinery processes from petroleum, and is also found as a natural deposit or as a component of naturally occurring asphalt in which it is associated with mineral matter. NOTE. The international definition of bitumen relates its solubility to carbon disulphide but, in the United Kingdom, the safer material trichoroothylene is used as the test solvent as examination has shown no significant difference.
2.2 bitumen-based coating. A liquid mixture of bitumen in a carrier (solvent or solvent mixture), usually paraffinic hydrocarbons, chlorinated hydrocarbons and aromatic hydrocarbons, with or without fllers, to give a consistency suitable for brushing, spraying, rolling or dipping in accordance with the recommendations of the manufacturer. The coating may exhibit thixotropy.
3 Classification
3.1 Bitumen-based coatings shall be classified into two types as follows.
(a) Type 1, without fllers.
(b) Type 2, with fllers.
3.2 Each type shall be further sub- classified as follows.
(a) Class A, using white spirit complying with BS 245 a the carrier.BS 3416 pdf download.