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We use an innovative British take on the well-established incising of seasoned fence posts. This game-changing pre-impregnation process ensures that the chemical treatment impregnates 6mm in the analytical zone which delivers the stipulated BS8417 15-year service life. FSC® Certified timber from sustainable sources Note: If the product is to be used in ground contact, it is highly recommended that you use our UC4 Incised Fence Posts which comes with a 15-year warranty.