Overview Reviews Product Description Silicon NanopowderSi-Crystalline, 99+% Pure, APS: 40 nm Product Videos Custom Field CAS Number 7440-21-3 Formula Si Dangerous Goods N/A Product Reviews Write a Review Write a Review × MKNano Silicon, 40 nm Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *