1.Basic Product Information

Product Name: DMTDA (Dimethyl Thio Toluene Diamine)

Alias: E-300, Ethacure 300, Liquid PU Chain Extender, MOCA Replacement Curing Agent

CAS No.: 106264-79-3

Molecular Formula: C₉H₁₄N₂S₂

Molecular Weight: approx. 214.35 g/mol

Molecular Structure: 

Grade Type: Industrial high-purity liquid PU & polyurea special grade

2.Product Overview

DMTDA (E-300), also known as Dimethyl Thio Toluene Diamine, is an advanced liquid aromatic amine curing agent and chain extender optimized for high-performance polyurethane elastomers and premium polyurea systems. As an eco-friendly and high-efficiency alternative to traditional MOCA, E-300 features room-temperature liquid state, low viscosity, moderate curing speed, excellent mechanical toughness and superior heat resistance. It effectively solves the defects of solid curing agents such as preheating melting, high energy consumption and unstable reaction. Cured PU products show outstanding wear resistance, low-temperature flexibility and structural stability, becoming the preferred core material for high-end industrial elastomers, precision accessories and heavy-duty anti-corrosion coatings.

3.Typical Specifications

4.Physical & Chemical Properties

Physical Properties

DMTDA E-300 is a stable amber transparent liquid at room temperature with moderate viscosity and excellent fluidity. Different from traditional solid MOCA curing agent, it requires no preheating and melting, supporting direct room-temperature batching and construction. The product features low volatility, stable physical state and excellent compatibility with isocyanates, polyurea prepolymers, epoxy resins and various PU additives. No delamination, precipitation or agglomeration occurs during mixing, perfectly adapting to manual pouring, mechanical spraying and continuous industrial production processes.

Chemical Properties

DMTDA E-300 contains highly active aromatic amino groups, capable of stable and controllable cross-linking reaction with isocyanate (-NCO) groups. It features moderate curing speed, gentle exothermic reaction and sufficient cross-linking density, effectively avoiding product internal stress and cracking. The unique sulfur-containing aromatic molecular structure endows cured products with excellent heat resistance, solvent resistance, hydrolytic stability and anti-aging performance. It maintains stable mechanical properties under high-temperature, humid and corrosive working environments, with better toughness and wear resistance than conventional amine curing agents.

5.Main Applications

9.Finemax Advantages

Finemax Chemical supplies high-purity DMTDA E-300 liquid chain extender with stable batch quality and reliable performance. Our E-300 features accurate amine value, low moisture, stable viscosity and controllable curing activity, perfectly matching the formulation requirements of high-end PU elastomers and polyurea coatings. Replacing traditional MOCA safely and efficiently, our products help customers optimize production processes, improve finished product grades and reduce comprehensive costs. With strict quality control, mature production technology and sufficient stable supply, we provide professional one-stop raw material solutions for global new material and industrial manufacturing enterprises.

10.Inquiry & Service

Free Sample Support | Custom Technical Parameters | Professional Formulation Guidance

Contact us to get the latest factory wholesale price and complete technical datasheet.