After application of a newly formulated paste "BG-1" on all surfaces of air-dried lumbers, the boron have been found diffused completely in permeable and impermeable hardwoods at the rate of 12 mm radial thickness per week. The new paste may be a solution to protect lumbers being used or to be used under cover where timber is susceptible to termite and borer attack. The new cost effective paste was found to sterilize wood through diffusion and found suitable for pole maintenance at groundline and above groundline, e g cut ends, drilled holes, woodpecker's holes etc. as well as suitable for indoor use too. Compared to boron rods for internal diffusion in presence of moisture, this non-aquous boron based formulation will be more effective for external remedial treatment of problematic hardwood and softwood poles because external treatment is more critical to protect a sound shell required to carry maximum bending load. It is evident from field study that the remedial treatment is mandatory for all hardwood poles within first 10 years or earlier. Application of preservative paste during first installation of hardwood poles is an extra precautionary measure in the climatic condition similar to Bangladesh.

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