Guangdong Well-t Nanotech Co., Ltd. is a company based in China that lists colloidal silica sol, 5 nm particle-size colloidal silica, and refractory fibers with silica sol on Global Trade Plaza. The 5 nm product has a particle size range of 2–7 nm, pH 9–11, viscosity 6.5 mPa·s at 25 °C and a shelf life of six months. Buyers can send an enquiry through Global Trade Plaza.