Yinguang Juyin TDI 80/20 Flexible Foam Isocyanate

Yinguang Juyin TDI 80/20 Flexible Foam Grade Isocyanate is a toluene diisocyanate (TDI) product manufactured under the Gansu Yinguang brand, blended to the industry-standard 80/20 isomer ratio (2,4-TDI to 2,6-TDI). This ratio is the most widely used specification for slabstock and molded flexible foam production because it offers a balanced reactivity profile, giving foam producers a consistent cell structure, controlled rise time, and predictable curing behavior. As a grade designed specifically for flexible foam, it differs from isocyanates oriented toward rigid foam or coatings, and it is built to perform reliably with the standard polyether polyol systems used in cushioning applications.

Key Advantages of Yinguang Juyin TDI 80/20

Foam producers who choose this grade typically gain the following benefits:

• A stable 80/20 isomer ratio for consistent reaction kinetics from batch to batch.
• Low variation in free monomer content, enabling a more predictable NCO index in the formulation.
• Good compatibility with polyether polyols, water blowing agents, and standard amine/tin catalysts.
• Suitable for both continuous slabstock lines and intermittent foam molding processes.
• Cost-competitive positioning compared with specialty MDI systems for general-purpose flexible foam production.

How Yinguang Juyin TDI 80/20 Works in Flexible Foam Production

Reaction Mechanism

In flexible foam production, the isocyanate group (-NCO) in TDI reacts with the hydroxyl groups (-OH) in the polyether polyol to form urethane linkages, while a parallel reaction with water produces carbon dioxide gas, which acts as the main blowing agent. Because 2,4-TDI reacts faster than 2,6-TDI , the 80/20 ratio provides a reactivity profile that lets the gelling and blowing reactions proceed in balance, which is critical for achieving open, uniform cell structures rather than collapsed or overly tight foam.

Process Considerations

Proper control of the NCO index (typically in the range of 100–115 for standard flexible foam) directly affects foam firmness, resilience, and airflow. Foam producers usually run trial batches when switching TDI sources to fine-tune dosing and catalyst index, because minor differences in viscosity or free TDI between suppliers can shift the optimal formulation window.

Typical Applications

Sourcing Yinguang Juyin TDI 80/20 Through DOMI (HK) INDUSTRIAL

DOMI (HK) INDUSTRIAL CO., LIMITED , founded in 2022 and headquartered in Hong Kong, is an officially authorized distributor of world-recognized polyurethane manufacturers, including the manufacturer of the Yinguang Juyin TDI 80/20 grade. With annual sales exceeding 50,000 metric tons and a customer network spanning more than 30 countries and regions , DOMI (HK) INDUSTRIAL specializes in stable, high-quality, and cost-effective supply of TDI and related polyurethane raw materials. Customers purchasing this flexible foam grade through DOMI benefit from documentation support such as MSDS, TDS, and COA, as well as flexible sea and land transport terms designed to simplify international procurement.

Frequently Asked Questions

Q1: What does "80/20" in Yinguang Juyin TDI 80/20 mean?
It refers to the isomer composition: 80% 2,4-TDI and 20% 2,6-TDI, which is the standard ratio used for flexible foam toluene diisocyanate.

Q2: Is this grade suitable for rigid foam applications?
No. This grade is designed for flexible foam. Rigid foam typically uses polymeric MDI systems rather than TDI 80/20.

Q3: How should Yinguang Juyin TDI 80/20 be stored?
It should be stored in sealed, moisture-proof containers, away from direct sunlight and sources of moisture, since TDI reacts readily with water and humid air.

Q4: What documentation is typically provided with a shipment?
Standard documentation usually includes a Material Safety Data Sheet (MSDS), a Technical Data Sheet (TDS), and a Certificate of Analysis (COA) confirming the specifications of the specific batch.