DMTDA Equivalent To Ethacure 300

1. Product Overview:

Dimethylthiotoulenediamine (DMTDA) is equivalent to Ethacure 300 (Albemarle). It is a liquid aromatic diamine with low chronic toxicity, is an effective curative for polyurethane cast elastomers.It is used in both hot and room-temperature casting. It can also be used as a slower chain extender for polyurethane urea and polyurea elastomers in reaction injection molding, structural reaction injection molding and hand-applied and spray coating applications, alone or in blends with DETDA curative.

2. Physical and chemical properties:

• Appearance: Light yellowish liquid
• Boiling point,():353
• Density (g/cm3) @(20): 1.2
• Pour point(): 4
• Flash point():176
• Viscosity,cps @ 20:690
• Equivalent weight with isocyanates: 107
• Equivalent weight with epoxy resins: 53.5

3. Quality standard:

• Appearance: light yellowish liquid
• Color value: 8
• Diamine content(%): 99.0
• Amine value(mgKOH/g): 525-535
• Moisture(%): 0.1

4. Safety information:

• Class: 9
• Packing group: III
• UN No.: 3082
• EINECS NO.: 403-240-8

5. Packing size:

• 25kg/steel drum
• 200kg/steel drum
• According to customer requirements, with special packaging

6. Considerations: 

• To be nitrogen-sealed, if cannot be used as a packaging, should be subject to nitrogen-sealed storage.
• Avoid outdoor exposure or long-term placement under high temperature conditions.
• This product is in storage, preferably above 0 centigrade degree, can guarantee the same long-term quality.
• Darkens with time and exposure to air.

7. Processing:

Ethacure 300 is a low viscosity liquid that is ready for immediate use. Loading can be accomplised with simple hand pumps or gravity feed. Dry nitrogen should be used to blanket curative tanks.

8. % Theory

Selection of 95% theory is generally recommended. Lowering it to 85% theory will improve compression set and raise 300% modulus (tensile). Increasing to 105% theory will enhance tear strength and elongation.

9. Mix ratio

The following equiation calculates the amount of Ethacure 300 required for 100parts (by weight) of prepolymer.

% NCO×2.55×%Theory=Ethacure 300pph

%Theory is expressed as a decimal, i.e. 95% Theory is 0.95 for the calculation.