reflection. Often only one side is processed for real shine and the other side remains feeble. A pattern between the Swedish aluminium foil and Sri Lankan aluminium foil was discovered, where in general Sri Lankan aluminium foil was less shiny and therefore less reflecting. The aluminium foil used in the test on Sri Lanka was Diamond ® Aluminium foil and OSO TM Aluminium Foil. When untreated foil was tested in the reflection device Diamond ® had a reflection of 48.1 % and OSO TM 57.0 %.
39 The Diamond ® Aluminium foil had the proportions 762*45.7 cm and was of pretty heavy quality. Diamond lacked in reflecting ability but had advantageous proportions and durability. Continuous problems occurred when testing OSO TM Aluminium Foil. After a couple of meters the surface of the roll was partly oxidized. Two rolls where bought and both showed the same fabrication flaw. OSO TM aluminium had the proportions 30*2000 cm and was slightly more reflecting then Diamond ® Aluminium foil but as stated before had fabrication flaws and was more delicate. The prices for the foils where 245 rupees respectively 225 rupees, which gives a price per square meter of 70 rupees (0.7 USD) for Diamond ® and 38 rupees (0.38 USD) for OSO TM . 184.108.40.206 Aluminium Plate on Rolls In many of the Sri Lankan hardware stores aluminium plate on rolls in different qualities could be found. Some of the qualities are rather shiny and can be compared in some ways with galvanized iron plate. The rolls are approximately 20 m long and 0.6096 or 0.9144 m wide. There are also different qualities when it comes to thickness, between 0.5 mm and 2 mm. The thin qualities are easy to fold but lack in stability if you want it to work as both stabilizing material and reflecting material. The thicker qualities could carry its own weight and be folded so it stays in a certain angle. Untreated thin respectively thick aluminium plate had a reflection of 59.8 respectively 52.2 percent. Both of the qualities became poorer when polished. The polisher used was Brasso ® manufactured by Reckitt Lackiser. Aluminium in general reacts badly with polisher and tends to get more matt then before. Polished thin aluminium plate had 30.3 percent reflection and thick aluminium plate had 26.1 percent. Varnish seems to have a better effect. A fact to consider is that varnish did not bring up the reflection but can protect the surface from oxidation. Studies carried out with the reflecting device 1 showed that varnished thin aluminium plate got a reflection of 53.4 percent and varnished thick aluminium got a reflection of 34.1 percent. Since no metal varnish was available in the Arugam Bay area wood varnish was used. The varnished used was polyurethane based and named Nippolac ® . Silicone Coating (Pvt) Limited was the firm behind the brand. The varnish was not thinned before applying.