Aquadry was granted BBA Certification in November 2016 with a stated durability of 25 years. A number of laboratory tests were carried out by the British Board of Agrément (BBA) as part of the certification process.
To provide independent verification of product performance and to allow Aquadry to be used in conjunction with insulation measures carried out under ECO and the Green Deal which require 25-year durability.
Summary of Tests Carried Out
Water Vapour Transmission
Tests were carried out in accordance with BS EN 12572 : 2001 Hydrothermal Performance of Building Materials and Products – Determination of water vapour transmission properties in order to test the “breathability” of samples treated with Aquadry compared with that of untreated samples.
Tests were carried out in accordance with BS EN ISO 15148 : 2002 Hygrothermal performance of materials and products – Determination of water absorption coefficient by partial immersion in order to test the effect of Aquadry in reducing water absorption compared with untreated samples.
The water absorption tests (see above) were carried out before and after aggressive accelerated ageing using UV and freeze-thaw.
UV aged – In accordance with BS EN ISO 4892-3 : 2000 Plastics – Methods of exposure to laboratory light sources – Part 3 Fluorescent lamps. Exposed to UVB 313 lamps cycling 4 hours UV at 50°C followed by 4 hours condensation at 50°C. The samples were removed for testing after intervals of 2000 hours and 2500 hours.
Freeze thaw – Stored in a sealed cabinet controlled at -5°C for 8 hours and then at 23°C and 50% RH for 16 hours. Samples were exposed removed for testing after intervals of 30, 60 and 75 cycles.
Depth of Penetration
Sample of the various substrates prepared for the capillary absorption test were used to calculate the depth of penetration. The samples were broken in half and wetted with water to highlight the depth of penetration of the Aquadry. This was measured at five points across the width of the sample to the nearest half mm. The mean value and the maximum and minimum values were determined and recorded.
Determination of Drying Time
The brick samples prepared for the capillary absorption test were used on completion of the testing. The samples were immersed in water until saturated and then sealed in a vapour impermeable membrane with silicone sealant leaving only the Aquadry coated face exposed. The samples were kept in an atmosphere of 50% relative humidity and at a temperature of 23°C and were weighed at intervals until constant weight was acheived.