BS 5358:1993 pdf free.Specification for solvent-borne priming paints for woodwork.
BS 5358 specifies two types of solvent-borne priming paints for application on softwood for both interior and exterior use (see warning note in foreword).
NOTE 1 Paints complying with the requirements of this specification may be suitable for use on some non-resinous hardwoods, but the user is advised to consult the paint manufacturer in each individual circumstance.
NOTE 2 The titles of the publications referred to in this standard are listed on the inside back cover.
4 Sample
For the purposes of the tests referred to in clauses 5 to 15, a representative sample of the paint, measuring not less than 500 mL, shall be taken and packed by the method described in BS 3900-Al.
5 Composition
5.1 General
The primer shall be based on a pigmented non-aqueous solution or a dispersion of polymeric material. Neither the polymer nor the primer based on it shall contain any added plasticizer.
5.2 Volatile content (type A products only) The volatile content of the primer shall not exceed the limiting values specified in either a) or b) as follows:
a) not more than 50 % (rn/rn), when tested in accordance with BS 3900-B2 at a temperature of 105 ±2 °C;
6 Flashpoint for type A products only
The primer, when tested in accordance with BS 3900-A8 or BS 3900-A13, shall have a flashpoint higher than 32 °C.
7 Condition in container and
consistency
7.1 Initial condition
When the primer in its original container is examined by the method described in BS 3900-A2, it shall not show hard settling, excessive separation, skinning, irreversible gelation, mould growth or putrefaction.
Type A products shall be ready for use without thinning.
Type B products shall be supplied ready for use or in a form requiring thinning in accordance with the manufacturer’s recommendations.
7.2 Keeping properties
The primer, when stored in its original sealed container at between 4 °C and 25 °C for 12 months from the date of manufacture, shall comply with the requirements of 7.1, clauses 8, 9, 10.1 and 15.
NOTE If storage conditions are abnormal, the manufacturer of the primer should be informed so that any special recommendations may be made.
8 Application properties
8.1 Type A products
When the primer is applied in accordance with BS 3900-A5 to a plywood panel with moulding and examined not less than 16 h after application, using normal or corrected vision, the film shall be free from sagging, wrinkling or sheariness (see BS 2015).