Fire-retarding properties of nano-silver in solid woods
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Fire-retarding properties of 200 ppm nano-silver solution, with a size ranging from 20 to 80 nm, on five woody species were studied and compared with Borax and Celcune®. Blocks of 150 × 130 × 9 mm³ were prepared and divided into four groups of control samples, nano-silver-, Borax-, and Celcune-impregnated specimens. A special apparatus was designed, and six fire-retarding properties of each specimen were measured, namely ignition, glowing, back-darkening and back-holing times, as well as length and width of burning. Results showed that all three kinds of treatments had improving effects on the fire-retarding properties. Celcune showed the best improvement on glowing time. Cluster analysis showed direct relation between density and fire-retardant properties; also, fire-retarding behaviors of the four hardwoods were quite different to those of the one softwood. Furthermore, there are improvements in some fire-retarding properties of nano-silver-impregnated specimens that are in connection with its heat-transfer property.
The author is grateful to Mr. Mohammad Hossein Nikoonejad, the Dean of The Basije Asatid of Shahid Rajaee Teacher Training University. I appreciate the kind efforts of Mr. Ne’mat Karimi, Mr. Nour-Mohammad Rahmatollahi, and Mr. Yousef Azari, BS graduates at SRTTU, and Mr. Taha Sokhandan and Mr. Abolfazl Rezaii, active members of Wood Industries Scientific Association of SRTTU, as well as Engin. Hadi Gholamiyan (The University of Tehran) for their great cooperation and help in primary wood preparation and tests.
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