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Home / Products / Toluene Diisocyanate (TDI) / TDI 65/35 Specialty Foam Grade

TDI 65/35 Specialty Foam Grade

TDI T65/35 is a toluene diisocyanate designed for polyurethane foaming processes characterized by medium to low reactivity. Due to its higher 2.6-TDI content, it offers an extended working time and improved flowability during foam formation, making it well-suited for the production of large molded parts and complex shapes that require excellent foam uniformity.

The product has an NCO content of approximately 48.3% and a freezing point of about 13°C. It remains a stable liquid at room temperature, which facilitates storage, transportation, and continuous production processes.

Compared to standard TDI grades, T65/35 provides a wider processing window during the initial stage of foaming, allowing the material to spread sufficiently before gelation occurs and ensuring more uniform mold filling. This helps to reduce density variations in large foam products and improves the consistency of the cellular structure.

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Product Application

TDI T65/35 is suitable for the production of flexible polyurethane foam where a controlled foaming rate, extended flow time, and high molding uniformity are required, including:

Continuous foam production lines.
Large-scale foam blocks and sponge-based products.
Slow-recovery (memory) foam and functional bedding/sleep materials.
Medical cushioning, pillow inserts, and high-quality mattress foam.
Large, complex-geometry molded foam parts.
Automotive seating, furniture cushioning, and vibration-absorbing materials.

With its extended flow time and stable processing characteristics, TDI T65/35 is well-suited for polyurethane production systems that require a balance between processing efficiency and foam quality, ensuring a more uniform cell structure and consistent performance in the final product.

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Established in 2022 and headquartered in Shanghai, DOMI (HK) INDUSTRIAL CO., LIMITED is a trusted supplier and officially authorized distributor of globally recognized polyurethane manufacturers, including Covestro, Wanhua Chemical, Cangzhou Dahua, and Gansu Yinguang. Leveraging strong partnerships with leading producers, we ensure a stable and reliable supply of premium polyurethane raw materials to customers worldwide. As a China-based TDI 65/35 Specialty Foam Grade factory and wholesale supplier of polyurethane raw materials, DOMI (HK) INDUSTRIAL CO., LIMITED provides reliable sourcing and customized solutions to meet the needs of customers worldwide.

With annual sales exceeding 20,000 metric tons and a global customer network spanning more than 30 countries and regions, we have built a solid reputation for quality, reliability, and professional service. Our core product portfolio includes TDI (Toluene Diisocyanate), Polymeric MDI, Polyether Polyol, and Polymer Polyol (POP), widely used in furniture, mattresses, automotive components, insulation materials, coatings, adhesives, and other polyurethane applications.

Driven by a commitment to customer satisfaction, competitive pricing, and efficient logistics solutions, Dongmei (HK) Industrial provides stable, high-quality, and cost-effective supply services. Backed by comprehensive documentation support, including MSDS, TDS, and COA, as well as flexible sea and land transportation options, we help customers streamline procurement processes and achieve long-term business success.
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TDI 65/35 Specialty Foam Grade Industry knowledge

TDI 65/35 Specialty Foam Grade is a toluene diisocyanate blend with an isomer ratio of 65% 2.4-TDI to 35% 2.6-TDI , a composition that differs significantly from the more common 80/20 grade used in general-purpose flexible foam. This higher proportion of the 2,6-isomer slows the overall reactivity curve and changes the balance between the two isocyanate positions, which is why the 65/35 grade is classified as a specialty product rather than a general-purpose one. It is typically chosen when a formulator needs a slower, more controlled reaction profile for demanding molded or high-resilience foam systems.

Key Advantages of the 65/35 Isomer Ratio

  • Longer cream and gel time compared with 80/20 TDI, giving processors a wider window to fill complex mold cavities before the foam sets.
  • More balanced reactivity between the two isomers, which can reduce localized over-curing in thick or complex-shaped foam parts.
  • Better suited to high-resilience (HR) and semi-flexible molded foam that requires fine surface detail.
  • Useful for specialty formulations where standard 80/20 or 100% 2,4-TDI reacts too fast for the intended process.

How TDI 65/35 Behaves in a Foam Formulation

Isomer Reactivity Differences

The 2,4-isomer reacts faster with polyol hydroxyl groups than the 2,6-isomer, mainly because of steric and electronic effects around the isocyanate groups. In a standard 80/20 blend, the dominant 2,4-isomer drives have a relatively fast reaction. Shifting the ratio to 65/35 increases the share of the slower-reacting 2,6-isomer, which lowers the overall cure rate and helps formulators achieve a more gradual gelling profile.

Formulation Adjustments

Because the reaction kinetics differ from the 80/20 grade, catalyst type and loading, water content, and NCO index often need to be re-optimized when switching to 65/35 TDI. Processors typically run small trial batches to confirm demolded time and foam properties before moving to full-scale production.

Comparing TDI 65/35 with the Standard 80/20 Grade

Property TDI 65/35 TDI 80/20
2.4-TDI Content 65% 80%
Reactivity Rate Slower, more even Faster
Typical Use Specialty molded/HR foam Conventional slabstock foam
General comparison based on standard TDI isomer chemistry; actual foam performance depends on the complete formulation.

Typical Applications of Specialty-Grade TDI Foam

Thanks to its moderate reactivity, TDI 65/35 is commonly considered for:

  1. High-resilience molded foam for seating and cushioning where surface finish requirements are high.
  2. Thick-section specialty foam parts where slower gelling helps avoid internal scorching.
  3. Custom formulations that require a specific balance between open-cell structure and load-bearing support.

Sourcing TDI 65/35 Through DOMI (HK) INDUSTRIAL

DOMI (HK) INDUSTRIAL CO., LIMITED , founded in 2022 and headquartered in Hong Kong, is a trusted supplier and officially authorized distributor for world-recognized polyurethane manufacturers. With annual sales exceeding 50,000 metric tons and a global customer network across more than 30 countries and regions , DOMI (HK) INDUSTRIAL helps specialty foam manufacturers secure stable supplies of TDI grades, backed by full documentation such as MSDS, TDS, and COA, along with flexible sea and land transport options for smoother procurement.

Frequently Asked Questions

Q1: Why choose TDI 65/35 over the more common 80/20 grade?
The 65/35 ratio offers slower, more even reactivity, which is useful for molded or thick-section foam parts where the faster 80/20 grade may cure too unevenly.

Q2: Does switching to TDI 65/35 require changes to an existing foam formulation?
Yes. Because the reaction rate differs from TDI 80/20, catalyst levels, water content, and NCO index usually need adjustment and trial testing.

Q3: Is TDI 65/35 suitable for standard slabstock foam lines?
It can be used, but it is primarily selected for specialty applications and molded foam, where its slower reactivity offers specific processing advantages.

Q4: How should TDI 65/35 be stored to maintain quality?
It should be stored in sealed containers in a cool, dry, well-ventilated area, away from moisture and direct sunlight, since TDI is moisture-sensitive.

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