FH-7 is medium-low temperature powder, mainly used in high ... wattage loading or liquid heating element. Electrical grade magnesium oxideType FH-7Characteristics FH-7 is medium-low temperature powder, mainly used in ... .minisite.productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); electrical grade magnesium oxide (FH-7)