Forest Products Laboratory

Title: In situ thermal condensation of glucose-diammonium phosphate in wood for fire and fungal decay protection

Author: Chen, George

Date: 2009

Source: Wood and fiber science. Vol. 4, no. 2 (Apr. 2009): pages 105-116.

Description: Thermal condensation of glucose-diammonium phosphate in wood at 160 and 190[degrees]C will protect wood against fire and decay in one treatment using an aqueous system. For fire protection, treatments at 160 or 190[degrees]C led to low flammability as evidenced by fire-tube tests. For nonleached wood, weight losses were 1.9, 2.0, and 2.0% with chemical retentions of 56.7, 44.7, and 64.7%, respectively, for 2-, 4-, and 6-h heating; and for leached wood, weight losses of 5.1, 3.8, and 1.5% with chemical retentions of 24.5, 24.1, and 45.6%, respectively, for 2-, 4-, and 6-h heating compared with 18.8% weight loss for diammonium phosphate-treated wood with chemical retention of 19.4%. The control had 84.4% weight loss. For decay protection, heat treatment at 190[degrees]C for 30 min after 2-wk water leaching also prevents degradation by brown and white rot fungi. Weight loss by Gloeophyllum trabeum (Gt) was 0.4% with 19.5% chemical retention, and weight loss by Trametes versicolor (Tv) was 1.5% with 17.8% chemical retention. The control had 30.6 and 36.8% weight losses by Gt and Tv, respectively.

Keywords: Dehydration, diammonium phosphate, fire and fungal decay protection, glucose, thermal condensation, wood, biodegradation, heat treatment, brown rot, leaching, fire testing, phosphorus compounds, wood-decaying fungi, fireproofing of wood, fireproofing agents, Gloeophyllum trabeum, Trametes versicolor, white rot, flammability, treated wood, resistance to decay, fire resistance, fire retardants, preservation, wood decay

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Citation

Chen, George  2009.  In situ thermal condensation of glucose-diammonium phosphate in wood for fire and fungal decay protection.   Wood and fiber science. Vol. 4, no. 2 (Apr. 2009): pages 105-116..