What does the number on the packaging barrel mean?

N-Methylpyrrolidone (DMP): 1. Uses of N-Methylpyrrolidone: This substance is an excellent high-quality solvent, offering advantages such as low toxicity, high boiling point, strong solvating power, low flammability, biodegradability, recyclability, safe use, and suitability for a variety of formulation applications. It is widely used in fields such as petrochemicals, pesticides, pharmaceuticals, and electronic materials. 1. N-methylpyrrolidine and its industrial grade variants: used in lubricant refining, as antifreeze additives for lubricants, for the desulfurization of syngas, as electronic insulating materials, in agricultural herbicides, as additives for pesticides, for the recovery of PVC by-products, and as additives and dispersants in the production of high-quality coatings, inks, and pigments. For example, it is used to extract aromatics from lubricating oils in order to refine them ； Due to its high solvency for resins, NMP can be used as a solvent in resin processing for the production of coatings, floor finishes, varnishes, composite coating films, insulating materials for printed circuit wire coatings, fiber fabrics, and adhesives, among other products. 2. N-Methylpyrrolidine and aramid grades: Extraction and recovery of basic organic raw materials, such as acetylene concentration and the extraction of butadiene, isoprene, aromatics, etc. It can be used as a solvent for recovering acetylene from the thermal cracking gases of natural gas or light naphtha, achieving a purity of 99.7% in the recovered acetylene; it serves as an extractant for separating and recovering high-purity butadiene from cracked C4 hydrocarbons, with a recovery rate of 97% and a butadiene purity of 99.7%; it is utilized as an extractant for recovering high-purity isoprene from cracked C5 hydrocarbons, giving an isoprene purity of 99%. When used as an extractant for aromatics, its high solubility for aromatics along with low vapor pressure results in low losses of the extractant during the process and high recovery rates of aromatics. 3. N-Methylpyrrolidone: It is used as an auxiliary material for electrode production in polymer lithium-ion batteries, as well as in the production of LCD liquid crystal materials ； Solvents for polyvinylidene fluoride, etc ； As well as industrial detergents—used for cleaning chemical processing equipment, blockages, deposits, and coating layers, etc. Used as a solvent for polymers and polymerization reactions. For example, polymerization solvents for producing insoluble engineering plastics (polyphenylene sulfide, polyimide, polyamide, polyurethane) and aramid fibers and other polymers. 4. N-Methylpyrrolidine, reagent grade: Used for degreasing, descaling, dewaxing, polishing, rust prevention, and paint removal in industries where strict control of metal ions and particles is required, such as integrated circuits and hard drives. It can also be used as a solvent for removing photoresist, as well as for cleaning precision instruments in the IC semiconductor industry, LCD materials, PCBs, and hard drives ； As well as solvents produced for the pharmaceutical industry, such as those used in artificial kidney function membranes and seawater desalination membranes. II. Properties of N-methylpyrrolidine: Molecular formula: C5H9NO; Molecular weight: 99.134; Boiling point: 204°C; Flash point: 95°C. Molecular structure: N-methylpyrrolidine is a colorless and transparent liquid with strong hygroscopicity; it is soluble in water as well as various solvents such as acetaldehyde, ether, and propanol. III. Specifications for N-methylpyrrolidine:
Grade: Reagent grade, Electronic grade, Aramid grade, Industrial grade
Purity (wt%, GC): ≥99.9, ≥99.9, ≥99.9, ≥99.8
Moisture content (wt%, K.F.): ≤0.008, ≤0.01, ≤0.02, ≤0.03
Colority (Hazen): ≤8, ≤10, ≤15, ≤20
Density (D420, g/ml): 1.032–1.035, 1.032–1.035, 1.032–1.035, 1.032–1.035
Refractive index (ND20): 1.466–1.472, 1.466–1.472, 1.466–1.472, 1.466–1.472
IV. N-methylpyrrolidine is packaged in galvanized iron drums or plastic containers, with a net weight of 200 Kg per drum. Custom-made. V. Storage and transportation of N-methylpyrrolidine: Store in a cool, well-ventilated warehouse, away from sources of fire and heat. When handling, be gentle to avoid damage or leakage.