BS 1088:2018 pdf download – Marine plywood – Requirements
BS 1088 specifies requirements for two classes of marine plywood:standard; and
intended for use primarily in the manufacture of marine craft and in other marine and waterwayapplications.
The requirements also take into consideration the use of marine plywood in building construction.BS 1088 addresses in particular the resistance of plywood to bio-deterioration and loss of bondstrength with time.It does not make provision for other properties which might additionally berelevant in a particular end use.
Plywood made in accordance with this standard might also need to meet additional requirements inlegislation and/or standards specific to its end use that are not covered by this standard.
With particular reference to building construction, experience has shown that rapid ingress of waterat the panel edge during the build process can cause differential swelling in the core, resulting inlocalized catastrophic rupture of the wood fibres, thus giving the appearance of delamination. Ifsubsequent integrity of the waterproof envelope of the building is not maintained, similar problemscan arise.BS 1088 cannot make provision for such events since the choice of veneer species is basedonly on density and resistance to bio-deterioration.
NOTE 1 where marine plywood is to be used in building construction, attention is drawn to the ConstructionProducts Regulations 2013 .Conformity with these can be verified through demonstrating conformity withBS EN 13986.
NOTE 2 When used in building construction, good site practice with particular reference to protection of thebuilding elements against wetting is of the highest importance for ensuring the intended results for the building.
The following documents are referred to in the text in such a way that some or all of theircontent constitutes provisions of this document. For dated references, only the edition citedapplies.For undated references, the latest edition of the referenced document (including anyamendments) applies.
BS 1203,Hot-setting phenolic and aminoplastic wood adhesives — Classification and test methodsBSEN 314-1,Plywood — Bonding quality — Part 1: Test methods
BSEN 314-2:1993,Plywood — Bonding quality — Part 2: RequirementsBS EN 322,Wood-based panels — Determination of moisture content
BS EN 324-1, Wood-based panels —Determination of dimensions of boards — Part 1: Determination ofthickness, width and length
BS EN 324-2,Wood-based panels —Determination of dimensions of boards — Part 2: Determination ofsquareness and edge straightness
BS EN 326-1, Wood-based panels —Sampling, cutting and inspection —Part 1: Sampling and cuttingof test pieces and expression of test results
BS EN 335:2013, Durability of wood and wood-based products —Use classes: definitions, application tosolid wood and wood-based products
3Terms and definitions
For the purposes of this British Standard, the following terms and definitions apply.3.1amino resin
thermosetting synthetic resin derived from a condensation reaction of the-NH- groups of amines oramides with aldehydes
NoTE“Urea-formaldehyde (UF)” and “melamine-formaldehyde (MF)” resins are mainly of significance in theadhesives field.
[SOURCE:BS EN 923:2015,2.3.51, modified]
output, which may comprise boards of more than one thickness, of a single product type within asingle shift of maximum 8 h duration
either one ply or two or more plies glued together with their grain direction parallel, oranother material
[SOURCE: BS EN 313-2:2000,2.11]
3.4standard marine plywood
veneer plywood comprising heartwood of wood species of superior natural biological durability withan exterior glue bond
[SOURCE:BS EN 314-2:1993]
3.5 lightweight marine plywood
veneer plywood comprising wood species of lower density than those used in standard marineplywood (see 3.4) with an exterior glue bond
NOTE1 Lower density wood species in most cases have lower natural biological durability than the species used instandard marine plywood.
NOTE2 Lightweight marine plywood is generally specified only where low weight is of critical importance to thedesign.An example of a lower density timber species is gaboon.
3.6pMDI (diphenylmethane diisocyanate, isomers and homologues)
mixture containing 4,4′-methylenediphenyl diisocyanate (MDI), other methylenediphenyldiisocyanate isomers,and low oligomers
NOTElt is produced by the reaction of aniline and formaldehyde, using hydrochloric acid as a catalyst toproduce a mixture of diamine precursors, as well as their corresponding polyamines. These diamines are reactedwith phosgene to form a mixture of isocyanates. Distillation of the mixture leads to pMDI.
thermosetting synthetic resin derived from a condensation reaction of a phenol with an aldehyde.BS 1088 pdf download.