Comparative study on weathering durability property of phenol formaldehyde resin modified sweetgum and southern pine specimens

The effects of low molecular weight phenol formaldehyde resin on weathering durability property sweetgum (Liquidambar styraciflua) and southern pine (Pinus taeda) specimens were studied using six wet-dry cycles with ultraviolet light accelerated test following ASTM via evaluating the water repellent efficiency, dimensional stability, crack formation wood. results showed that 1) efficiency treated quarter-sawn was higher than those flat-sawn specimens; 2) stabilities all improved by impregnating resin, especially for sweetgum; 3) there clearly more cracks exposed ends surfaces control ones, indicating modification used in this study not able to improve anti-cracking properties specimens. Generally, suitable be impregnated procedure described according stability order durability.