The anionic surfactant sodium lauryl ether sulfate (SLES) is the main component of most commercial foaming agents (FAs) used in the excavation of highway and railway tunnels with Earth pressure balance-tunnel boring machines (EPB-TBMs). Several hundreds of millions of tons of spoil material. consisting of soil mixed with FAs. are produced worldwide. https://safeersappliancers.shop/product-category/hisense-rs694n4tf1-american-style-fridge-freezer-black-steel/