... Product Description According to the principle of light color, train the multiple reflections and refractionsTrain phychemical properties: non-metallic ... powder, acid, alkali, Don't spontaneous combustion, no.Train loose density: 0.14-0.45 g/cm3Train thermal ... is good, most varieties can be used in outdoor long-term.Train resistance transference: no, good fastnessTrain health: avirulent insipidity ...