Copper/chromium/arsenic preparations for wood preservation
BS 4072:1999 pdf free.Copper/chromium/arsenic preparations for wood preservation.
This standard specifies requirements for two types of waterborne preservatives containing mixtures of compounds of copper (II), chromium (VI) and
(i) for applicat ion to timber to 1)rotet it against attack in serice by wood-destroying organisms.
NOTE I Teat methnd.s are given in annex A and annex H and giddanee on methods of timber treatment is given in annex C.
NOTE 2 The preparations are not necessarily suitable for au wood presernition applications. Advice on their suitability is given in ItS 12142 and in commodity specifications and codes of practice for timber preservation.
2 Normative references
The following normative docunwnts contain
l)rosiotLs which, through reference in this text, constitute provisions of this British Standard. For dated references, subsequent amendments to, or revisions of, any of these publwations do not apply. For undated references, the latest edition of the publication referred to applies.
BS 1647-1:1984, pH ineasureincul — Part 1: Specifica I ion for p11 cruur.
BS 1752:1983, Sjx’cificution far laboratory sintered orfrilted filtees including p(nmcity grading.
BS 1792, Specfica I ion for one-nw tvolumeS eEc flasks.
BS 2586, Specification for gla.ss and refrreuee elect rvdes r the metisu returnS of p1!.
BS 2648, Performance requ i return Is for elect ricaliy-hea ted laboratory drying ovens. 85 3145, Sperifica lion for lubora tory p1! im’frrs. BS 5666-1, I!ethods of analysis of wood preservatives and treated timber — Part 1: Guide to sampling and pirpa ration qf wood preservat i vt’s and treated timber for analysis.
BS 5666-3, Method.s of analysis of wood preservatives and treated timber — Part J: Quantitative analysis of preservatives and treated timber containing copper/cb n’ in i u tn/a rseii ic form ulat ions.
US EN ISO 3696:1995, Writer for analytical laboratory use — Specification and test methods.
3.1 Raw materials
The preservatives shall consist of a mixture of compounds of copper (II), chromium (VI) and arsenic (V).
NOTE I The prrfened nuixtures of compounds an’ as follows:
a) copper (III sulfate. soditini d,chn,niatr and hydraled arsenic (V) oxide;
b) copper (U) oxide. chroi,iitrni (VI) oxide and arseiuc (‘.1) oxide. NOTE 2 Minor additives an penuilted.
Two formulations are specified (designated type 1 and type 2, respectively). The nominal proportion and the iiiinimum proportion of each component in the preservative formulation shall be as specified in Table I for salt based formulations or as specified in Table 2 for oxide based formulations. The sum of the proportions of the individual components shall he not less ihan 95% (rn/rn),
NOTE I Variations in compcsution from the nominal composition can arise because of variations in tin’ purity of tiningrediertis of the mixture.
The preservatives shall be supplied as mixtures.
NOTE 2 The usual forms are as a paste or as a concentrated solution for suLi’qtienI dilution.
NOTE 3 PreservatIves a supplied can vary in coiieentndloii as a result of vañations in nater uuflteflt.
The containers in which the preservatives are supplied shall carry information on the mass of the preservative mixture equivalent to unit iuas.s of the preservative formulation as specified in Table 1 or Table 2, aS applicable.BS 4072 pdf download.Copper/chromium/arsenic preparations for wood preservation