How to avoid fatty spew on leather? Download our free whitepaper on fatty spew and learn about its background, where it comes from, and what can be done to prevent its formation. On processed leathers it is sometimes observed that, over time, an undesired white milky film appears on top of the leather. This white layer often gives rise to debates on its origin and causes, and in some cases leads to a claim for damages. The phenomenon described is called ‘fatty spew’. The possible sources of fatty spew may be of diverse nature, they are similar in one respect. They always originate from high melting point substances. Download the whitepaper ‘Fatty Spew’ My email address** First name** Last name** Company name** Stay informed Please keep me informed about the latest news on Royal Smit & Zoon and the leather industry.Consent* I have read and accepted the Terms & conditions and Privacy Statement. Δ What is fatty spew? All fats have a tendency to migrate through the leather when they are not irreversibly fixed to the matrix. Free saturated fatty acids, as all other substances, are sensitive to the influence of temperature. One of temperature’s effects is that it can change a substance’s appearance. The reason for the white layer on the grain is the high melting point, which is about 60°C to 70°C for all of the substances causing fatty spew. Below this temperature they begin to solidify but remain undetectable to the eye. Interesting for you Discover more on Wet End Whitepaper Color Analysis on Leather The SmiTool Light and Heat already discussed the subject of heat yellowing and light fastness tests on leather. The current SmiTool explains the differences between subjective and objective assessments of tested leather and how to report test results for heat yellowing and light fastness. Exploring the Different Types of Leather Chemicals Used in Leather Production From Tanning Agents to Finishing Chemicals: A Comprehensive Overview of the Different Types of Leather Chemicals. Certifications for safer chemistry you should know about How to source sustainable materials? Asking for the right certifications helps. For the leather supply chain there are 4 certification every brand should know of. Wet End Discover Stay informed Receive the latest company news and industry updates Subscribe Share this:
