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ELECTRICAL GRADE MAGNESIUM OXIDE1?SD-8 Series:Including SD-8(Grade A)?SD-99A(Grade B)?series MgO products are light silicone or no silicone treatment MgO, including Grade A,Grade B,Grade C,Grade D, which can be used for air heating elements with different wattage loading . It can bear high-heat treatment( such as 1050? annealing),but it can’t be moisture-proof, and need to be sealed immediately and effectively.?2?SD-99Series:Including SD-99 series MgO products are moisture-proof and high temperature resistant magnesium oxide, ?which are mainly used for air heating elements with different wattage loading, isn’t suitable for high-heat treatment(such as 1050? annealing),it has high moisture proof property, simply sealing is available. We suggest to dry the heating elements at 200?-350? before sealing.3?SD-6 Series:Including SD-6 series MgO products are moisture-proof magnesium oxide, ?which are mainly used for non-air heating elements (Such as copper tubes, aluminum tubes ,Bundy tubes or stainless steel tubes etc. with stronger convection and contact thermal transfer), and can satisfy different requirement. It is high moisture-proof, simply sealing is available. We suggest to dry the heating elements at 200?-350? before sealing.4?SD-3(Hot Plate Powder):SD-3 ?is moisture-proof magnesium oxide, GRADE C, used for heating elements such as?hot plate made by oil hydraulic press, commonly known as hot plate powder ,which has high moisture-proof property. The heating wire can be put in the MgO powder ,then press to be any shape or pressed in the metallic channel. We suggest to dry the heating elements at 200?-400? for 2 ~ 4 hours after shaping.link:http://www.superbheater.com/materials-and-fitting/tubular-heater-materials-and-fitting-parts/ucm-tateho-quality-tubular-cartridge-heaters.html