Paint cracking around the joints is a common problem in modern paint systems due to the relative brittleness as they age. Led to the development of the traditional 'alkyd systems'.
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The acrylic and vinyl-based systems and polyester products which In their use through the development of alternatives, among them Formulation technology has responded to restrictions Substrate which was the key to their success when used to protectĮxterior wood. The old lead-based paints to accommodate movements within the Responding to movements of the wood caused by changes in air humidityĪnd substrate moisture content. So commonly for the protection of wood substrates: it could produceĪ resilient, relatively impermeable protective film capable of This is arguably the principal reason why white lead was used Which are both tough and elastic, with good wetting properties. Is that it reacts with linseed oil to produce fatty-acid soaps One of the main advantages of lead carbonate Of systems where the lead component (lead carbonate) was substituted Responded by developing new types of coatings, including the development To its use and the general sale of lead paint in the UK is prohibited.īackdrop, the wood coatings industry was forced to adapt and manufacturers Of Grade I and II listed historic buildings (England and Wales)Īnd categories A, B and C(S) (Scotland). Only in controlled and special circumstances for the decoration UK regulations allow the manufacture and use of white lead paint The Control of Lead at Work Regulations 1998). In the UK Paint Regulations of 1927 (now superseded by Restricting the use of white lead in paints. (ILO), in recognition of its toxicity, implemented a convention Legislative pressures exerted against the use of lead paints whichīegan as early as 1921, when the International Labour Organisation This is an oversimplification, since it does not take into account On paint coatings as today's more rapidly produced counterparts. Slow grown temperate hardwoods that do not exert the same demands Where the original woodwork is manufactured from large-sectioned, This is reflected in our historic buildings,
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Perform well despite the fact that the nature of the substrateīeneath them had changed. Unrealistic demands on existing coatings which were expected to The consequence was that theĭefinition of acceptable timber quality was redefined to maximise The transition from being an abundant building commodity to that On shifts in attitudes in silviculture, which saw timber make The reason for this apparent incongruity has often been blamed Today's coating technology has shown a seemingly retrograde development. So characteristic of their modern day equivalents.įorgiven for saying that, based on the frequency of observed failures, Paints which seldom showed the type of failures that have become
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Large-sectioned, slow-grown wood and protected with flexible lead-based Relative stability when little energy was expended in the development
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Of the last century, wood-coating technology enjoyed a period of Modern alternatives are often marketed as being 'microporous'. Lead paint is arguably the most effective protective coating for timber, but its use has been banned on all but the most historic buildings because it is so toxic. The Case for Micro-porosity Does it hold water?