BS EN 492:2012 pdf download

BS EN 492:2012 pdf download.Fibre-cement slates and fittings -Product specification and test methods.
For specimens tested dry, either:
— calculate the corresponding wet values v0. using the method in Annex B. in which case t shall conform to Table 1 (see 5.3.3), or
calculate the appropriate revised value for the specifications .T51d, using the method m Annex B in which case the dry results shall conform to the revised value.
7.3.3 Water Impermeability
7.3.3.1 Preparation of specimens
Sample three fib.’e-cemenl slates and keep them for at least seven days in ambient laboratory conditions.
7.3.3.2 Apparatus
7.3.3.2.1 Vertical transparent tube, 300 mm long with a minimum bore of 35 mm.
7.3.3.3 Procedure
Seal the vertical transparent tube to the middle of the upper face of the test specimen supported horizontally for inspection.
Fill the tube with water to a height of approximately 250 mm. measured from the upper surface of the test specimen
Leave for 24 h In ambient laboratory conditions.
Examine the under face of the test piece after 24 h.
7.3.3.4 ExpressIon and interpretation of results
After visual assessment, the result shall conform to the specification of 5.34.
7.3.4 Warm water
7.3.4.1 Preparation of specimens
Sample ten fibre-cement slates as delivered. Gut ten pairs of specimens to sue me bending test in.
Both specimens of a pair shall be cut from the same fibre-cement slate and each given the same number for
later comparison of results.
7.3.4.2 Apparatus
7.3.4.2.1 Water bath, with a temperature control at (60 ± 2) C;
7.3.4.2.2 Bending test machine, as described in 7.3.2.2.
7.3.4.3 Procedure
Divide the paired specimens to form two lots of ten specimens each.
Submit the first lot of ten specimens to the bending test in accordance with 7.3.2 induding the conditioning procedure see Table 4).
The result shall conform to the specification of 5.4,2.
74.2 Heat-rain
7.4.2.1 PreparatIon of specimens
The test shall be carried out on at least eleven full size fibre-cement slates as delivered
7.4.2.2 Apparatus
7.4.2.2.1 Frame, inclined at (25 ± 5) placed in a space without draught but suitably ventilated
7.4.2.2.2 Heating device. capable of maintaining the specified unifom, temperature on the surface of the tested elements.
The heating devce shall have a power output regulated by means of a black body temperature sensor located at the central area of the test ng where the maximum temperature is expected, i.e. at the closest distance underneath a heating unit.
The temperature at this location shall be regulated at (70± 5) C and shall be reached alter 15 mm of heating
Al any lime, the difference between black body temperature In the centre and black body temperatures near the corners of the test rig (also measured undemeath heating units) shall not exceed 15 C.
7.4.2.2.3 Water sprinkling device, with an output of appioxlolately 2,5 li(m2.min). delivering water at ambient temperature (over 5 C).
The area of the frame shall be at least 1,50 m x 1.50 m.
NOTE For this iest, an aluminium plate of 1 mm thiduiess painted with a malt black paint m tiemd as a black body: the
meurement device being a thermocouple or a similar device fixed on the surface of the aluminium plate.
7.42.3 Procedure
Condition the specimens by storing then, to slow them to reach equilibrium for seven days in a latoratory atmosphere.
Fix at least eleven fibre-cement slates according to the manufacturer’s instrudions.
Inspect the fibre-cement slates before cycling commences for appearance, signs of damage due to transportation, fixing and handling. Any damaged slate shall be replaced.
Submit the upper face of the fibre-cement slates to fifty wetting and heating cycles in accordance with Table 5.
7.5.1.1 Slates satisfying the requirements for the external fire performance, due to the deemed to
satisfy list
Slates covered by this European Standard are considered “deemed to satisfty without the need of testing” in
relation to the requirements for extermal fire performance, provided that they meet the definitions given in
Comission Decision 2000/553/EC.
NOTE
Member States may have national “deemed to satisty’ Mists going further than that given in Decision
2000/553/EC.
7.5.1.2
Other slates
Slates not covered by 7.5.1.1 shall be tested and classified in accordance with EN 13501-1. The slates to be tested shall be installed, in addition to the general provisions given in CEN/TS 1187, in a manner representative of their intended use in accordance with the manufacturer’s specifications.
7.5.2 Test for reaction to fire
7.5.2.1
Slates and fttings satisfying the requirements for the fire reaction Class A1 without the
need for testing
Slates or ftings containing 1 % or less organic substances by mass or volume, whichever is the most onerous, are considered to satisfty the requirements for performance Class A1 of the characteristics reaction
to fire, in accordance with the provisions of EC Decisions 96/603/EC, as amended, without the need for testing.