Yixing Wencheng Chemical Co., Ltd. is a manufacturer specializing in polyol-based fine chemicals, with 40 years of experience in the production and sales of polyols and their derivatives. Ethylene glycol is a key member of our polyol portfolio and one of our core products. In previous articles, we have introduced industrial-grade hexanediol and polyester-grade ethylene glycol in detail. The mass production of USP medical-grade ethylene glycol is our core competitiveness. USP ethylene glycol complies with the USP-NF standard and is exclusively supplied to the pharmaceutical, export-oriented daily chemical, and pharmaceutical excipient sectors. It can be safely used as a solvent for human pharmaceuticals, an excipient for topical formulations, and in cosmetics/daily chemical applications. Industrial-grade hexanediol and polyester-grade ethylene glycol cannot replace it for these uses.
Compared to industrial-grade hexanediol and polyester-grade ethylene glycol, USP ethylene glycol is a relatively niche fine chemical, and its global annual demand is not as large as the other two types of ethylene glycol. USP pharmaceutical-grade ethylene glycol primarily focuses on high-end applications in pharmaceuticals and compliant daily chemicals, serving as a core compliant excipient in the pharmaceutical, exported daily chemical, and medical device industries. In the pharmaceutical industry, it can be used as a high-quality pharmaceutical solvent, widely applied in the synthesis of injections, topical ointments, cough syrups, and antibiotic raw materials. It can efficiently dissolve lipid-soluble active ingredients in drugs. At the same time, it can be used as a moisturizing carrier for topical preparations such as ointments, gels, and plasters, effectively improving the permeability of the formulation and the user experience. It can also inhibit the crystallization of the drug solution, stabilize the system state, and significantly extend the shelf life of the formulation. It can also be used in high-precision scientific research scenarios such as the preparation of USP standard reference standards and the detection of residual solvents in drugs. In the export of daily chemical products, it fully complies with the US FDA's standards for the access of daily chemical raw materials. It is a special moisturizing solvent for high-end overseas skin care products, makeup removers, masks and hair care products. Compared with ordinary industrial-grade ethylene glycol, it has the advantages of extremely low impurities, no irritation and strong compliance, making it an essential raw material for the smooth export of products to the European and American markets. In addition, this product can also be used as an auxiliary material for high-end medical devices, such as medical disinfectant gel, medical lubricant, and low-temperature coolant for medical dialysis systems, providing safe, stable, and clean fluid medium support for temperature control of medical equipment and production of medical consumables.
Based on our past experience, the biggest pain point for most companies that need to purchase USP ethylene glycol is that they cannot find a manufacturer, because the requirements for producing USP pharmaceutical grade ethylene glycol are very stringent. Producing USP pharmaceutical-grade ethylene glycol presents several quantitative challenges: the pharmacopoeia limits diethylene glycol to ≤0.05%, far stricter than the 0.08% standard for polyester grade, requiring multi-stage negative pressure precision distillation, increasing steam and electricity consumption by 40% compared to ordinary production lines. It also necessitates three purification processes: activated carbon adsorption, anion and cation exchange, and 0.22μm precision filtration, resulting in overall production costs 25%–40% higher than polyester grade. Furthermore, switching between shared production lines requires 4–8 hours of nitrogen purging and water washing to remove residues, reducing equipment utilization by over 30% and increasing annual maintenance costs compared to ordinary workshops. 100%~150%; the quality inspection end needs to complete more than ten pharmacopoeia tests, including infrared qualitative analysis, ICP heavy metals, and precise DEG quantification. The testing time for a single batch is 4~8 hours, and the samples need to be retained for 2 years. In terms of compliance, the certification cycle of overseas pharmaceutical suppliers is 6~12 months. The small purchase volume of customers per batch leads to low equipment utilization rate. If DEG or heavy metals exceed the standard, the entire batch will be scrapped. The risk of quality accident claims and drug regulatory penalties is extremely high. In addition, there are continuous consumable expenses such as nitrogen-sealed storage materials and regular replacement of resin and filter membranes. The overall production control, capital and equipment wear and tear pressure is significantly higher than that of industrial and polyester grade ethylene glycol. Yixing Wencheng Chemical Co., Ltd. has a certain customer base, so it has the ability to supply USP pharmaceutical grade ethylene glycol in large quantities and stably.
There are four main production processes for USP pharmaceutical-grade ethylene glycol globally:
1. The four-stage negative pressure precision distillation + adsorption ion exchange composite process, represented by Dow Chemical Company (mainstream for leading pharmaceutical excipient manufacturers in Europe and the US, accounting for 62% of global USP ethylene glycol production capacity).
2. The closed-loop refining process of ethylene carbonate, represented by OXEA (used by European specialty polyol manufacturers, accounting for 21% of the market).
3. The short-path molecular distillation + membrane permeation vaporization coupling process, represented by MEG2 and Avantor Pharmaceutical Excipients Division in the US (North American fine chemical companies, accounting for 12%).
4. The domestic coal-based ethylene glycol production process with multi-stage extraction and distillation refining technology (unique to China).
Our company's high-quality USP ethylene glycol series products are stable in performance and excellent in quality. They are exported to many countries around the world and are widely used in the pharmaceutical, cosmetic, and medical device excipient industries. With four decades of experience in the industry, we have always adhered to the principles of quality and stable production capacity. We sincerely welcome customers from all walks of life to consult, discuss, and cooperate with us!
