4,4' - Methylenebis (2-chloroaniline), also called MOCA, is a substance used as a crosslinking agent / chain extender for polyurethane products, especially for cast polyurethane elastomers (CPU).  Polyurethane elastomers are flexible and posse elasticity nature like rubber but with significant properties, it combines high elasticity of rubber and rigidity of plastic.   MOCA features with color stability in high temperature.  MOCA-base elastomers are good for abrasion / impact / chemical / oil / ozone and cold resistance, elasticity no matter with high or low hardness (Shore A to Shore D rating), high tensile / tear / compression strength, and absorption of vibration.  With the long pot life, it’s very easy to handle with, you can even handle manually instead of by machines.  Resulting from those physical properties and advantages, MOCA is the most common crosslinking / chain extender for urethane elastomers (TDI system).  Meanwhile, it’s also a universal curing agent for Epoxy products.   Comparing to DETDA & DMTDA, there are some obvious advantages of MOCA as follows. 1. The finished product is lighter in color. 2. MOCA is solid type, thus, it's much easier to store and less pollution. 3. Easy to handle. Long pot life. 4. Modulus is higher. 5. Lower price. MOCA is an aromatic diamine chain extender or curing agent that widely used in casting polyurethane elastomers, elastomeric pavement materials, PU waterproof coatings, PU adhesives, PU foams, etc. The MOCA-chain-extended PU elastomers are widely applied in the areas including machinery, building, vehicles, transportation, mining industry, electronic components encapsulation and sport facility, etc.  MOCA can also be used in curing epoxy resin. Our MOCA is high purity grade, the melt MOCA is colorless to yellowish transparent liquid, it is recommended used in the applications such as skateboard wheel, polyurethane rice hulling roller, scraper, light color PU coatings, etc. which require good property and almost colorless transparent in appearance. MOCA is a well-known aromatic diamine chain extender or curing agent for casting polyurethane (PU) elastomers. MOCA-base elastomers have excellent properties, are widely used in various areas including construction, building, vehicles, mining, semi-conductor, epoxy, sport facility and so on. 1. Bridging agent for electronic industry. 2. Waterproof material / coating for construction & architectural industry. 3. Chain extender for PU elastomers, i.e. jaw rubber coupling, PU spider. 4. Curing agent for epoxy resin. 5. Components for industrial usage, i.e. conveyor belts, casters, guide rollers, couplings. 6. Shock absorption pads for automotive industry. 7. Printing rollers, drum blades, squeegee blades, cleaning blades, scraper blades for printing industry. 8. Sealing material. 9. Epoxy insulation material. 10. Antibacterial urethane sheet. 11. Mineral separation screen. 12. Pipe linings. Packing: 25 kg or 50kg/fiber drum or bag Slight moisture absorption; avoid contacting with water. Keep away from sunlight. Shelf life: 24 months Iteam Specification Appearance White to yellowish flaky Color Milky white or Light yellow Odor Slight amine Purity (HPLC), % ≥99.0 Water, % ≤0.1 Amine equivalent 131 - 136 Specific weight 1.44 (solid) at 24℃ Specific weight 1.26 (liquid) at 107℃ Melting range ≥105℃ Free amine, % ≤1 Acetone insoluble, % ＜0.04 1.   Desmodur RE 2.   Desmodur RFE 3.   Hydroxyl-Terminated Polybutadiene HTPB CAS 69102-90-5 4.   DETDA CAS 68479-98-1 5.   DMTDA CAS 106264-79-3 6.  MMEA CAS 19900-72-2 7.  TDI-Bases Polyisoyanurate（RC） 8.  RN (40% Polyisocyanate And 60% Ethyl Acetate) 9.  1,5-Naphthalene Diisocyanate(NDI) 10.  DDI (Dimeryl Diisocyanate) 12.  P-Phenylene Diisocyanate (PPDI) 13.   PTSI (P-Toluenesulfonyl Isocyanate / Tosyl Isocyanate) 14.  CTBN (Carboxyl Terminated Butadiene Nitrile Rubber） 15.  www.theoremchem.com