Paints and coatings of all types are widely used to provide colour and pleasing aesthetics, and to prevent deterioration of the underlying substrate when exposed to various environments. Besides protection and beauty, however, coatings provide light reflectivity, camouflage surfaces, reflect and absorb heat, and provide a variety of other functions. With exposure to environmental parameters, coating degrades over time. This leads to crack initiation, propagation & delamination. If the coating is overheated, it can lead to loss of mass or decomposition and ingress of aqueous media can lead to change in the chemical composition of the coating as well.
ISO 4628-5 is part of the ISO 4628 series on the assessment and analysis of paint and varnish degradation due to weathering and age. ISO 4628-5 specifies a method for assessing the degree of flaking of coatings by comparison with pictorial standards. This system is intended to be used for defects caused by ageing and weathering, and for uniform changes, for example, yellowing.
ISO 4628-5 - the standard for paint coating degradation is useful for:
Most of the protective coatings perform well until an old age, at which time natural deterioration and degradation occur. Energy acting on a coating can degrade a material by breaking or interfering with the chemical bonds holding the resin together and to a substrate.
ISO 4628-5 provides guidelines for the assessment techniques to evaluate the degradation of coatings and to designate the quantity and size of defects. ISO 4628-5 guides you with assessing the intensity of uniform changes in appearance, and assessing the degree of flaking of the coating. This helps you to design better products and mitigate weathering challenges for coatings, so that your customers can enjoy long-lasting products.
BS EN ISO 4628-5:2016 supersedes BS EN ISO 4628-5:2003. BS EN ISO 4628-5:2016 includes a technical change with respect to BS EN ISO 4628-5:2003 which is:
EN ISO 4628-5:2016
ISO 4628-5:2016