That stuff is caustic soda - otherwise known as sodium hydroxide NaOH. Nasty stuff. I have worked in an Alumina plant for many years, and those places are swimming in it. It is needed to dissolve the aluminium oxide out of bauxite. One of my colleagues stepped in a puddle of caustic and it got inside his work boots. All alumina plants have safety showers all over the place and we were told that with ANY spill, rip off all your clothes and hit those showers which also have special eye sprays.
My colleague was off work for 3 months, in great pain because of the exposed nerves the caustic had left, and will be scarred for life. You were lucky with your eyes! Hope you make a full recovery
