Sulphirol Fatliquors by Smit Smit has more than 50 years of experience in the sulphitation of natural oils and the supply of high quality sulphited fatliquors throughout the leather industry. Our product are best in class and offer state of the art leather softness by penetrating deep into the leather fibre structure. Due to their overall good emulsion stability, these products can be applied in multiple stages of the fatliquoring process. High Renewability and Bio-Based Carbon (C14) Content Since the base of these oils are natural oils, they contain very high levels of Bio-Based Carbon (C14, close to 100%) and have a high renewability. The Sulphirol range is an excellent choice when it comes to making your leather more sustainable. More information on our Sulphirols solutions can be found in the portfolio on the website of our Smit division. View Sulphirol Solutions Need more information? Do you have any questions about Sulphirol solutions? chat with us Read more Sustainable Solutions ESG approach Renewability and sustainability in the leather industry Newsroom Bringing Zeology leather to Milan Design Week 2025 APLF: taking Zeology leather to Hongkong Royal Smit & Zoon maintains EcoVadis Platinum Rating – confirming its position as sustainability leader read all Opinions Hans’ perspective: Reflecting on 2021 and a look into the future Renewability and Sustainability in the leather industry Re: Ending the use of leather? Are you sure? read all