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Henkel’s Bonderite M-ED 11001 (was Almeco Seal SLT) is a liquid concentrate which prevents the formation of unsightly smut, during the sealing of anodised aluminium, without adverse effects on quality tests – simply by adding to hot water seal tanks. Bonderite M-ED 11001 has been formulated to adjust the pH of the sealing solution to approximately 5.8 during the first few days of operation. The pH should be monitored regularly, especially in hard water areas, and adjusted accordingly in the range of 5.5 – 6.5. Although the solution is buffered, it is recommended that it is checked regularly, and adjusted when required with ammonia or acetic acid. Adequate and thorough rinsing of parts prior to the sealing bath will help to ensure the range is maintained. (pH adjustments should not be made with caustic or sulphuric acid). Providing the water does not contain an excess of sealing poisons (phosphates, silicates or fluorides), Bonderite M-ED 11001 can be used in tap water of low hardness. Otherwise, deionised water or softened water should be used. Tanks should be constructed from stainless steel or other acid and heat resistant materials. Natural and colour anodised parts can be sealed free from smut.