BS EN 927-10:2019 pdf free.Paints and varnishes – Coating materials and coating systems for exterior wood.
The coating material or the coating system under test is applied on test panels or cut strips under specified conditions. After specified drying time and under specified climatic conditions, the two test panels or cut stripes are placed crosswise in contact with each other. This assembly is subsequently placed in a test apparatus to be subjected to a specified load under specified climatic conditions. After a specified period of time, the load is removed and the test panels manually separated under specific climatic conditions and the contact areas examined for any damage to the coating in the area of contact. The wood shall be spruce (Picea abies) that has been selected to be free from knots and cracks, to be straight-grained and of normal growth rate (i.e. between 3 and 8 annual rings per 10 mm). The panels shall be planed all round to a smooth and uniform finish. The inclination of the growth rings to the test face shall be [45土10]°. See Figure 1. The wood shall be free from blue stain and evidence of surface or bulk infection. Abnormal porosity shall be avoided. Condition the wood prior to conversion into test panels in accordance with ISO 554 at (20士2) °C and a relative humidity of [65士5) %. The density of the wood shall be between 0,4 g/cm3 and 0,5 g/cm3 when measured at an equilibrium
moisture content at standard climate in accordance with ISO 554 at (20士2) °C and a relative humidity of[65+5) %.In case of customer-specific requirements or if it might be assumed that other types of wood might give a different result an alternative wood species should be used as substrate. It is also an option for manufacturers to provide an already coated test specimen from which test panels can be cut. The chosen panel shall be precisely described in the test report. The surface of the specimens provided shall  be plane. The test substrate shall be conditioned until constant mass at standard conditions according to ISO 554 [(20士2) °C and [65土5) % relative humidity].BS EN 927-10 pdf download.