Stearic acid: Scientific name: stearic acid. White or white powder or crystalline lumps of greasy feel, the cross-section of microstrip luster of fine needle-like crystals; grease-like micro-smelly, tasteless. Almost insoluble in water. The pour point of the pour point of the product (Appendix VI D) not less than 54 ° C. Iodine value of the goods iodine value (Appendix VII H) is not greater than 4. The acid value of the acid value of the goods (Appendix VII H) 203 to 210. Water-soluble acid of the product 5g, heating and melting, and other contents of the new boiling hot water, shake for 2 minutes, let cool, filtered, and the filtrate was added 1 drop of methyl orange indicator solution, not red color. Neutral fat or wax to take this product 1.0g of anhydrous sodium carbonate 0.5 g with 30 ml of water and boil to dissolve, the solution should be clear. Residue on ignition to take this product 4.0g, according to inspection (Appendix VIII), no residue left over 0.1%. Heavy metals ignition residue left over residue, according to inspection (Appendix VIII H method), containing heavy metals should not exceed five millionths.