Gelatin, a colorless to light yellow solid, in the form of powder, flakes or lumps. It is shiny, odorless, and tasteless. The relative molecular mass is about 50,000 to 100,000. The relative density is 1.3~1.4. It is insoluble in water, but when immersed in water, it can absorb 5-10 times of water to swell and soften. If heated, it will dissolve into a colloid, and it will become a gel when cooled to below 35-40°C; if the aqueous solution is boiled for a long time, The properties change due to decomposition, and no gel is formed after cooling. It is insoluble in ethanol and chloroform, but soluble in hot water, glycerin, propylene glycol, acetic acid, salicylic acid, phthalic acid, urea, thiourea, thiocyanate and potassium bromide. This product does not solidify when the concentration is below 5%, and usually forms a gel with a 10%-15% solution. The gelation temperature varies with concentration, coexisting salts and pH value. Viscosity and gel strength vary with the relative molecular mass distribution, and are also affected by pH, temperature and electrolyte. If the solution of this product encounters formaldehyde, it will become an irreversible gel that is insoluble in water. This product is easy to absorb moisture, due to bacteria, please pay attention to it when storing. When hydrolyzed, various amino acids can be obtained