For professionals in the polyurethane industry, selecting the correct grade of Toluene Diisocyanate (TDI) is paramount to achieving desired product performance. While several isomer ratios exist, TDI 80/20 and TDI 65/35 are among the most commonly utilized. This article delves into the nuances of these ratios, empowering you to make informed purchasing decisions and understand how to buy the most suitable Toluene Diisocyanate for your specific needs. As a leading manufacturer and supplier of TDI in China, we aim to provide clarity on these critical chemical specifications.

Toluene Diisocyanate (TDI) is an aromatic diisocyanate, a fundamental raw material for producing polyurethane (PU) materials. It is commercially available in various isomer combinations, primarily differing in the proportions of 2,4-TDI and 2,6-TDI. The most prevalent ratio, TDI 80/20, comprises approximately 80% 2,4-toluene diisocyanate and 20% 2,6-toluene diisocyanate. This ratio is widely favored for its balance of reactivity and foam properties, making it an excellent choice when you need to purchase materials for flexible foam production, including sponge making.

Conversely, TDI 65/35 contains roughly 65% 2,4-TDI and 35% 2,6-TDI. This higher concentration of the 2,6-isomer leads to a slightly different reaction profile and can influence the physical characteristics of the resulting polyurethane. For instance, foams made with TDI 65/35 might exhibit subtle differences in hardness, resilience, or processing characteristics compared to those made with TDI 80/20. Understanding these differences is key to optimizing your formulations and production processes.

When evaluating which TDI isomer ratio to source, consider your primary application. For general-purpose flexible polyurethane foams, such as those used in upholstery, mattresses, and automotive seating, TDI 80/20 often provides the best all-around performance. Its well-established processing window and predictable outcomes make it a reliable workhorse. If your project demands specific properties that benefit from the reactivity profile of the 2,6-isomer, exploring TDI 65/35 might be beneficial. Consulting with a knowledgeable chemical supplier like ourselves can provide valuable insights tailored to your application.

Ultimately, the decision between TDI 80/20 and other ratios hinges on detailed product requirements. Factors such as desired foam density, compression set, tear strength, and processing temperatures should guide your choice. By understanding the fundamental differences, you can more effectively communicate your needs when seeking a Toluene Diisocyanate 80/20 price or a quote for alternative ratios. We are committed to being your reliable partner, offering high-quality TDI and expert guidance to ensure your success in the competitive polyurethane market.