DEG vs Ethylene Glycol vs TEG: Choose the Right Glycol | DEG Diethylene Glycol Supplier
发布于 2026-10-18
In current alcohol-ether feedstock procurement, diethylene glycol (DEG, CAS 111-46-6), ethylene glycol (MEG), and triethylene glycol (TEG) are often placed on the same price comparison sheet. All three belong to the ethylene glycol ether family, but differences in physical properties determine that their roles in different units are not fully interchangeable. Since 2024, MEG has been affected by polyester demand and port inventory fluctuations, with East China spot prices oscillating in the range of RMB 4,200–4,600/ton for an extended period; DEG, due to diverging demand from unsaturated resin and antifreeze, has mostly traded at RMB 3,900–4,300/ton, with the price spread versus MEG once narrowing to within RMB 200/ton; TEG, supported by natural gas dehydration and polyester polyol, is generally quoted RMB 1,500–2,500/ton higher than DEG. For buyers, the key to selection is not "which is cheaper," but "which delivers the lowest total cost under your formulation and logistics conditions."
I. Property and Application Differences: First "Can It Be Used," Then "Is It Worth It"
The core difference among the three lies in the number of hydroxyl groups and boiling point. MEG is difunctional with a boiling point of approximately 197°C and is the primary raw material for polyester fiber and antifreeze; DEG also contains two hydroxyl groups but has a larger molecular weight and a boiling point of approximately 245°C, with slightly lower reactivity, making it more suitable for unsaturated polyester resin, polyurethane chain extenders, and low-freezing-point antifreeze formulations. TEG contains three hydroxyl groups with a boiling point of approximately 288°C and high viscosity, and is mainly used for natural gas dehydration, polyester polyol, and plasticizers. If DEG is used directly to replace MEG in polyester chip production during procurement, batch downgrading often results from color and hydroxyl value deviations; conversely, using MEG to replace DEG in antifreeze formulations will noticeably shift the freezing point and boiling point curves. Therefore, for procurement involving diethylene glycol antifreeze raw materials, priority should be given to confirming freezing point specifications and metal corrosion test data rather than simply comparing prices. For customers requiring small-batch trial production, diethylene glycol drum/IBC shipping is more flexible than tank trucks and can reduce initial trial-and-error costs.
II. Price and Supply-Demand: The Spread Structure Is Changing in 2024–2025
From the supply side, domestic DEG is mainly a co-product of ethylene-based MEG units, with an output ratio of approximately MEG:DEG = 10:1, so DEG supply elasticity is naturally weaker than that of MEG. In 2024, East China MEG port inventory once dropped below 600,000 tons, driving MEG prices higher in phases, while DEG, due to an unsaturated resin operating rate of only about 50%, lagged noticeably in price increases, with the two sometimes even inverted. TEG is affected by the pace of import arrivals, with tank farm inventory in South China persistently low and quotations firm. For buyers with monthly consumption above 200 tons, it is advisable to pay attention to the tiered pricing mechanism for [diethylene glycol wholesale](https://www.topdeg.com/en/about.html); typically, volumes above 200 tons can be RMB 150–250/ton lower than spot orders. If the enterprise is located in East China or South China, the delivered cost difference between 220 kg iron drum diethylene glycol and tank truck delivery can be controlled within RMB 80/ton, suitable for small and medium-sized customers without storage tanks. It should be noted that the price spread between DEG and MEG is not a stable arbitrage opportunity, and formulation substitution must undergo bench testing and stability verification.
III. Logistics and Compliance: The Logic for Choosing IBCs, Iron Drums, and Tank Trucks
DEG is a low-toxicity chemical, but transportation and storage still need to comply with relevant hazardous chemical labeling requirements. Tank trucks are suitable for continuous production units with monthly consumption above 500 tons; IBCs are suitable for intermittent production of 50–200 tons/month; and 220 kg iron drums are suitable for small batches below 20 tons or remote areas. In terms of packaging costs, IBC turnover and cleaning costs are amortized at approximately RMB 80–120/ton, while one-way iron drum packaging costs more but requires no return management. For export or cross-regional transfers, it is advisable to prioritize a [diethylene glycol supplier](https://www.topdeg.com/en/) with hazardous chemical operating qualifications and to require COA and MSDS for each batch. If the buyer also needs MEG and DEG, consideration can be given to consolidating shipments through the same [DEG manufacturer](https://www.topdeg.com/en/about.html) direct sales channel to reduce per-ton logistics allocation. Regarding storage, DEG is highly hygroscopic; long-term storage should maintain nitrogen blanketing or dry air protection to prevent moisture exceeding specifications and affecting downstream reactions.
Procurement Recommendations
First, lock in the application before comparing prices. For polyester and antifreeze main raw materials, prioritize MEG; for unsaturated resin, polyurethane chain extension, and low-freezing-point formulations, prioritize DEG; for natural gas dehydration and polyols, prioritize TEG. Second, establish a "delivered total cost" model that incorporates packaging, freight, payment terms, and batch consistency rather than looking only at spot quotations. Third, for DEG procurement, it is advisable to lock in more than two [DEG supplier](https://www.topdeg.com/en/) sources simultaneously to avoid supply interruptions caused by co-product output fluctuations; enterprises with monthly consumption exceeding 300 tons can request a monthly average price-linked formula. Fourth, small-batch customers should prioritize IBC or iron drum packaging and confirm whether the supplier supports mixed-load shipments. Fifth, all substitution plans must undergo bench testing and accelerated stability testing; in particular, for formulation changes involving CAS 111-46-6 diethylene glycol, the MSDS and labels must be updated accordingly.
Conclusion
Diethylene glycol, ethylene glycol, and triethylene glycol do not have a simple "high-low substitution" relationship; rather, they are differentiated selections determined by hydroxyl number, boiling point, and downstream reaction pathways. In the 2025 market environment, the narrowing spread between MEG and DEG has prompted some buyers to consider substitution, but formulation verification and logistics costs often offset the apparent price difference. For B2B procurement, a more prudent strategy is: determine the grade by application, determine packaging by volume, and determine the number of suppliers by supply stability. In the DEG segment, choosing a [diethylene glycol supplier](https://www.topdeg.com/en/) with co-production capability, multiple packaging options including IBCs and iron drums, and the ability to issue complete compliance documentation is more effective at controlling full-year total cost than chasing the lowest per-ton price. For current [DEG price per ton](https://www.topdeg.com/en/product.html) trends and [DEG for unsaturated resin](https://www.topdeg.com/en/blog.html) application data, please refer to our product and blog pages.
如需询价，欢迎拨打 139-0618-9208 或邮件 yanfeng.chemical@gmail.com。