DMTDA (E-300 EQUIVALENT)

DMTDA (E-300 equivalent) is a liquid aromatic diamine curing agent and chain extender.
DMTDA (E-300 equivalent) reacts with isocyanate-terminated prepolymers to form polyurethane and polyurea networks.
DMTDA (E-300 equivalent) is used in cast elastomers, coatings, adhesives, seals, rollers, belts, wheels, and wear-resistant components.

CAS Number: 106264-79-3
EC Number: 403-240-8
Molecular Formula: C₉H₁₄N₂S₂
Molecular Weight: 214.35 g/mol

SYNONYMS

DMTDA (E-300 equivalent), DMTDA, DMTDA E-300 Equivalent, DMTDA E300 Equivalent, E-300 Equivalent Curative, E300 Equivalent Curative, Dimethylthiotoluenediamine, Dimethyl Thio-Toluene Diamine, Dimethyl Thio Toluene Diamine, Dimethylthiotoluene Diamine, Dimethylthiodiaminotoluene, Dimethylthio Toluenediamine, DMTTDA, DM-C-TDA, DADMT, Bis(methylthio)toluenediamine, Di(methylthio)toluenediamine, Di-(methylthio)toluenediamine, 3,5-Dimethylthio-2,4-toluenediamine, 3,5-Dimethylthio-2,6-toluenediamine, 3,5-Bis(methylthio)-2,4-toluenediamine, 3,5-Bis(methylthio)-2,6-toluenediamine, 2,4-Diamino-3,5-dimethylthiotoluene, 2,6-Diamino-3,5-dimethylthiotoluene, 2-Methyl-4,6-bis(methylthio)-1,3-benzenediamine, 4-Methyl-2,6-bis(methylthio)-1,3-benzenediamine, Bis(methylsulfanyl)methylbenzenediamine, Aromatic Diamine Curative, Liquid Aromatic Diamine, Liquid Polyurethane Curative, Polyurethane Amine Curative, Polyurethane Chain Extender, Polyurea Chain Extender, Aromatic Amine Chain Extender, Cast Polyurethane Hardener, Cast Elastomer Curative, Isocyanate Prepolymer Curative, TDI Prepolymer Curative, MDI Prepolymer Curative, NDI Prepolymer Curative, PPDI Prepolymer Curative, Liquid Diamine Crosslinker, Sulfur-Containing Aromatic Diamine, Delayed-Reactivity Aromatic Diamine, Hand-Casting Polyurethane Curative, Machine-Casting Polyurethane Curative, MOCA-Alternative Curative, Chlorine-Free Aromatic Diamine, Wear-Resistant Elastomer Curative, CAS 106264-79-3, EC 403-240-8

APPLICATIONS

DMTDA (E-300 equivalent) serves as an aromatic diamine chain extender for isocyanate-terminated polyurethane prepolymers.
DMTDA (E-300 equivalent) forms substituted urea hard segments that contribute strength, hardness, tear resistance, and thermal performance.

DMTDA (E-300 equivalent) supports cast polyurethane elastomers produced from TDI-terminated prepolymers.
DMTDA (E-300 equivalent) provides liquid handling that can simplify mixing and casting compared with solid aromatic diamine curatives.

DMTDA (E-300 equivalent) functions with compatible MDI-based prepolymers in high-performance polyurethane elastomer systems.
DMTDA (E-300 equivalent) must be matched to prepolymer NCO content, viscosity, processing temperature, and required working time.

DMTDA (E-300 equivalent) can be evaluated with PPDI- and NDI-based prepolymers requiring aromatic amine chain extension.
DMTDA (E-300 equivalent) suitability depends on reaction rate, cure temperature, hardness target, dynamic properties, and post-curing conditions.

DMTDA (E-300 equivalent) contributes to polyurethane wheels used in material-handling and industrial-transport equipment.
DMTDA (E-300 equivalent) supports compounds requiring abrasion resistance, load-bearing capability, resilience, and resistance to repeated deformation.

DMTDA (E-300 equivalent) serves in polyurethane roller coverings for printing, conveying, steel processing, paper handling, and industrial machinery.
DMTDA (E-300 equivalent) can provide durable elastomeric surfaces when hardness, core adhesion, grinding, and cure conditions are properly controlled.

DMTDA (E-300 equivalent) supports papermaking belts and shoe-press belts requiring fatigue resistance and controlled crack development.
DMTDA (E-300 equivalent) has been documented as a hardener for polyurethane layers used in papermaking-belt constructions.

DMTDA (E-300 equivalent) functions in conveyor-belt components, belt coatings, and flexible wear layers.
DMTDA (E-300 equivalent) must be evaluated for flex fatigue, abrasion, tear propagation, reinforcement adhesion, and operating temperature.

DMTDA (E-300 equivalent) contributes to mining screens, hydrocyclone components, liners, and other wear-resistant polyurethane articles.
DMTDA (E-300 equivalent) can support high-strength elastomers where particle abrasion, impact, vibration, and repeated loading are important.

DMTDA (E-300 equivalent) supports scraper blades, squeegees, snowplow edges, and industrial wiping components.
DMTDA (E-300 equivalent) helps produce elastomer networks that balance edge rigidity with flexibility and wear resistance.

DMTDA (E-300 equivalent) functions in polyurethane seals, packing elements, wipers, and hydraulic components.
DMTDA (E-300 equivalent) must be tested for compression set, fluid compatibility, pressure, friction, and service temperature.

DMTDA (E-300 equivalent) contributes to polyurethane gaskets and vibration-isolation components.
DMTDA (E-300 equivalent) allows hardness and damping behavior to be adjusted through prepolymer type, stoichiometry, filler loading, and cure schedule.

DMTDA (E-300 equivalent) supports bumpers, buffers, springs, pads, and shock-absorbing polyurethane components.
DMTDA (E-300 equivalent) can provide load-bearing elastic behavior while component geometry determines stress distribution and fatigue life.

DMTDA (E-300 equivalent) functions in solid tires, caster components, forklift wheels, and heavy-duty wheel coverings.
DMTDA (E-300 equivalent) should be evaluated for heat buildup, rolling resistance, chunking, flat spotting, and bond durability.

DMTDA (E-300 equivalent) contributes to polyurethane-coated shafts, drums, pulleys, and drive components.
DMTDA (E-300 equivalent) can provide traction and abrasion performance when the cured elastomer is securely bonded to the underlying core.

DMTDA (E-300 equivalent) supports polyurethane adhesives formulated for bonding compatible elastomers, plastics, metals, and composites.
DMTDA (E-300 equivalent) has been identified as a primary aromatic diamine component in two-part polyurethane adhesive systems.

DMTDA (E-300 equivalent) functions in polyurethane and polyurea repair compounds for damaged rubber or elastomer components.
DMTDA (E-300 equivalent) must be evaluated for substrate preparation, open time, cure shrinkage, interfacial adhesion, and environmental exposure.

DMTDA (E-300 equivalent) contributes to protective polyurethane coatings applied by casting, spreading, or controlled reactive deposition.
DMTDA (E-300 equivalent) can produce tough films and layers when the substrate, prepolymer, curative ratio, and curing conditions are compatible.

DMTDA (E-300 equivalent) supports thick-section elastomeric linings for tanks, chutes, hoppers, pipes, and process equipment.
DMTDA (E-300 equivalent) processing must account for exotherm, air release, gel time, section thickness, and post-cure uniformity.

DMTDA (E-300 equivalent) functions in polyurethane encapsulation and potting systems requiring a flexible but mechanically strong cured network.
DMTDA (E-300 equivalent) can be evaluated for electrical properties, thermal cycling, moisture resistance, adhesion, and dimensional stability.

DMTDA (E-300 equivalent) contributes to polyurethane tooling materials, molds, patterns, and forming components.
DMTDA (E-300 equivalent) supports machinable or wear-resistant elastomers when hardness and filler loading are appropriately selected.

DMTDA (E-300 equivalent) supports polyurethane soles, heels, and technical footwear components requiring high wear resistance.
DMTDA (E-300 equivalent) must be assessed for flexing, hydrolysis, color, density, rebound, and adhesion to the footwear assembly.

DMTDA (E-300 equivalent) functions in polyurethane sporting goods and recreational components requiring repeated impact absorption.
DMTDA (E-300 equivalent) can be used in wheels, rollers, protective pads, and flexible molded articles after application-specific testing.

DMTDA (E-300 equivalent) can be blended with other compatible diamine or diol chain extenders to modify cure and physical properties.
DMTDA (E-300 equivalent) blended-curative systems can adjust working time, hardness, phase structure, thermal behavior, and dynamic performance.

DMTDA (E-300 equivalent) serves in laboratory and production development of cast polyurethane and polyurea elastomers.
DMTDA (E-300 equivalent) can be assessed through gel-time, rheometry, hardness, tensile, tear, rebound, abrasion, compression-set, aging, and dynamic testing.

DESCRIPTION

DMTDA (E-300 equivalent) is a sulfur-containing aromatic diamine curing agent commonly supplied as a liquid isomeric mixture.
DMTDA (E-300 equivalent) is identified under CAS Number 106264-79-3 and EC Number 403-240-8.

DMTDA (E-300 equivalent) consists primarily of 3,5-dimethylthio-2,4-toluenediamine and 3,5-dimethylthio-2,6-toluenediamine.
DMTDA (E-300 equivalent) is formally described in European chemical records as a reaction mass of these two isomers.

DMTDA (E-300 equivalent) isomers share the empirical molecular formula C₉H₁₄N₂S₂.
DMTDA (E-300 equivalent) has a representative molecular weight of approximately 214.35 g/mol.

DMTDA (E-300 equivalent) contains two primary aromatic amine groups and two methylthio substituents on a methyl-substituted benzene ring.
DMTDA (E-300 equivalent) has a theoretical amine equivalent weight of approximately 107.2 g per equivalent of isocyanate-reactive amine functionality.

DMTDA (E-300 equivalent) is normally supplied as a yellow, amber, or brownish liquid.
DMTDA (E-300 equivalent) liquid form enables pumping, weighing, metering, vacuum degassing, and mixing without preliminary melting.

DMTDA (E-300 equivalent) reacts rapidly with terminal isocyanate groups to produce substituted polyurea linkages.
DMTDA (E-300 equivalent) aromatic and sulfur-containing substituents moderate reactivity sufficiently for controlled casting in compatible formulations.

DMTDA (E-300 equivalent) is commonly associated with predominantly 2,4-isomer chemistry and a smaller 2,6-isomer fraction.
DMTDA (E-300 equivalent) exact isomer ratio should be verified from the current grade specification and certificate of analysis.

DMTDA (E-300 equivalent) creates hard segments through reaction with isocyanate groups in polyurethane prepolymers.
DMTDA (E-300 equivalent) hard-segment concentration and microphase structure influence hardness, modulus, tensile strength, tear resistance, and heat behavior.

DMTDA (E-300 equivalent) can be used with polyester-, polyether-, polycarbonate-, and other compatible polyurethane prepolymer backbones.
DMTDA (E-300 equivalent) final hydrolysis resistance, low-temperature flexibility, resilience, and chemical resistance remain strongly dependent on the prepolymer.

DMTDA (E-300 equivalent) cure stoichiometry is normally calculated from prepolymer NCO content and curative amine equivalent.
DMTDA (E-300 equivalent) under-indexing or over-indexing can alter hardness, residual functionality, network structure, compression set, and long-term durability.

DMTDA (E-300 equivalent) generally requires controlled preheating, thorough mixing, removal of entrained air, mold conditioning, and post-curing.
DMTDA (E-300 equivalent) exact processing temperature and post-cure schedule must be established for the chosen isocyanate prepolymer and component geometry.

DMTDA (E-300 equivalent) has limited water solubility and should be protected from moisture during storage and processing.
DMTDA (E-300 equivalent) moisture contamination can consume isocyanate groups and generate carbon dioxide, bubbles, porosity, and inconsistent physical properties.

DMTDA (E-300 equivalent) hazard notifications commonly identify harmful effects if swallowed, potential allergic skin reaction, and severe long-term aquatic toxicity.
DMTDA (E-300 equivalent) exact classification, labeling, transport status, and exposure controls must be taken from the current regional Safety Data Sheet.

PROPERTIES

Chemical Name: Dimethylthiotoluenediamine

Chemical Class: Sulfur-Containing Aromatic Diamine

Composition: 2,4- and 2,6-Diaminotoluene Methylthio Isomer Mixture

CAS Number: 106264-79-3

EC Number: 403-240-8

Molecular Formula: C₉H₁₄N₂S₂

Molecular Weight: Approximately 214.35 g/mol

Amine Equivalent Weight: Approximately 107.2 g/eq

Physical Form: Liquid

Appearance: Yellow to Amber or Brownish Liquid

Density: Approximately 1.20 g/cm³, Grade and Temperature Dependent

Water Solubility: Low

Primary Function: Aromatic Diamine Curative and Chain Extender

Main Uses: Cast Polyurethane Elastomers, Polyureas, Coatings, Adhesives, Belts, Rollers, Wheels, and Seals

Storage: Cool, Dry, Tightly Closed, and Protected from Moisture, Heat, Oxidizing Agents, and Environmental Release

FIRST AID

Inhalation

DMTDA (E-300 equivalent) inhalation exposure requires movement to fresh air and rest in a position comfortable for breathing.
DMTDA (E-300 equivalent) inhalation requires medical attention if coughing, dizziness, headache, respiratory irritation, or breathing difficulty develops.

Skin Contact

DMTDA (E-300 equivalent) skin contamination requires immediate removal of affected clothing and thorough washing with soap and water.
DMTDA (E-300 equivalent) skin exposure requires medical evaluation if irritation, redness, itching, swelling, or sensitization symptoms develop.

Eye Contact

DMTDA (E-300 equivalent) eye exposure requires immediate continuous rinsing with clean water for at least 15 minutes while the eyelids are held open.
DMTDA (E-300 equivalent) eye exposure requires contact-lens removal when easy and prompt medical attention if discomfort or visual disturbance continues.

Ingestion

DMTDA (E-300 equivalent) ingestion requires rinsing of the mouth without inducing vomiting unless directed by medical personnel.
DMTDA (E-300 equivalent) ingestion requires immediate contact with a physician or poison information center because the substance is harmful if swallowed.

Note to Physicians

DMTDA (E-300 equivalent) exposure should be treated symptomatically with appropriate supportive care.
DMTDA (E-300 equivalent) assessment should consider quantity, exposure route, sensitization potential, accompanying prepolymer components, symptoms, and the current Safety Data Sheet.

HANDLING AND STORAGE

Handling

DMTDA (E-300 equivalent) should be handled using closed transfer, metering, and mixing systems wherever practical.
DMTDA (E-300 equivalent) contact with skin, eyes, clothing, food, drink, moisture, oxidizing agents, and uncontrolled isocyanate residues should be prevented.

Ventilation

DMTDA (E-300 equivalent) transfer, heating, mixing, degassing, casting, and curing areas require effective general and local exhaust ventilation.
DMTDA (E-300 equivalent) respiratory protection should be used when engineering controls cannot adequately limit vapor, mist, aerosol, or heated-process exposure.

Storage

DMTDA (E-300 equivalent) should be stored in tightly closed and chemically compatible containers within a cool, dry, and well-ventilated area.
DMTDA (E-300 equivalent) should be protected from water, humidity, excessive heat, direct sunlight, oxidizing agents, contamination, and damaged packaging.

Spill and Leak Procedures

DMTDA (E-300 equivalent) spills should be isolated, contained with a chemically compatible absorbent, and recovered by trained personnel.
DMTDA (E-300 equivalent) should be prevented from entering drains, soil, groundwater, or surface water because of its aquatic environmental hazard.

Handling Precautions

DMTDA (E-300 equivalent) handling requires chemical-resistant gloves, protective clothing, tightly fitting goggles, and face protection where splashing is possible.
DMTDA (E-300 equivalent) processing should follow the current Safety Data Sheet, occupational risk assessment, environmental controls, emergency procedures, and validated polyurethane-curing instructions.