¡ïThe form above is just for reference.
* Attrition Testing Machine 1.96¡Á104pa Times:about
** Ultraviolet Radiation Machine:720hrs of exposure (equivalent
of 1 year's sunshine)
*** Attrition Testing Machine 1.96¡Á104pa Times:20[use
carious kinds of solvets(gasoline,light oil,lamp oil);cotton
fabric infiltrated by acid (PH3) and alkali (PH12)]