Aluminum hydroxide products testing methods.

　　1、Measurement of oil absorption value

　　Take 5g of aluminium hydroxide and place it on clean flat glass? Then drop the analytically pure castor oil into the aluminium hydroxide to be measured, stirring while dropping until the aluminium hydroxide to be measured can adhere more firmly together, note down the amount of castor oil (ml) at this time, that is, the amount of castor oil adsorbed for 5g of aluminium hydroxide, and then convert it into the amount of adsorption for 100g of aluminium hydroxide, that is, the amount of oil absorption measured.

　　2、The measurement of unsaturated polyester paste viscosity

　　According to the mass ratio of 2:3 weighing a certain amount of unsaturated polyester and aluminium hydroxide powder, placed in a beaker, put into a constant temperature of glycerine bath, stirring paddle at different heights with the same stirring mode, stirring intensity, stirring length of time to stir the mixture in order to make it mixed uniformly, to be mixed after the paste to reach a predetermined temperature, continue to keep warm for 20min (due to the poor fluidity and heat transfer of unsaturated polyester, so keep A certain time to wait for its temperature everywhere to reach uniform), to be stable temperature measurement with a viscometer, to get the viscosity of the mixed paste value.

　　3、Measurement of loose density and reloading density

　　Take a 10ml clean and dry measuring cylinder, add aluminium hydroxide powder to 10ml, weigh and measure the loose density; then shake 100 times up and down at a height of 30mm to measure the reloading density.

　　Uses of aluminium hydroxide.

　　1、Aluminium hydroxide can be used to produce alumina products.

　　2、It is used to produce aluminium fluoride, cryolite, aluminium sulphate and other inorganic salts.

　　3、It is used in the manufacture of various flame retardants, waterproof fabrics, inks, glassware, paper fillers, roller skates and other supplies. Aluminum hydroxide colloidal solution has a great adsorption capacity, can adsorb colour quality or with it, so that the colour quality is fixed in the cotton fiber, in the dye industry is used as a mordant.

　　4、Aluminium hydroxide is used as a water purifier because it can gum up the turbidity in water and precipitate.

　　5, medicinal aluminum hydroxide is a long history of antacid, can be anti-acid, absorbing, local hemostasis and protection of ulcer surface and other effects, slow, lasting, but the effect is weak. It is often used as a drug to neutralize stomach acid and is the active ingredient of Gastrodia.