MOCA (MBOCA)
The industry-standard curing agent for cast polyurethane elastomers — the chlorinated aromatic diamine that gives rollers, wheels, seals and conveyor belting their characteristic toughness and durability.
Chelora Chemicals supplies MOCA to polyurethane casting shops worldwide, with the controlled handling documentation and regulatory support this product requires on every consignment.
Product identity
- CAS Number
- 101-14-4
- IUPAC name
- 4,4'-Methylenebis(2-chloroaniline)
- Molecular formula
- C₁₃H₁₂Cl₂N₂
- Molecular weight
- 267.15 g/mol
- Melting point
- 104-109 °C
- Density
- 1.44 g/cm³
- NFPA 704
- 2-1-0
- HS Code
- 2921 59*
* MOCA is a controlled substance in several jurisdictions. Confirm current import, occupational-use and SVHC/REACH status for your destination with your own regulatory affairs team before ordering.
What MOCA (MBOCA) is used for
MOCA — known interchangeably as MBOCA, and formally as 4,4'-methylenebis(2-chloroaniline) — is a tan to light-grey crystalline solid supplied as flake or pellet for metering into polyurethane casting formulations. Structurally it is the chlorinated analogue of 4,4'-methylenedianiline (MDA): the same two aniline rings joined by a methylene bridge, but each ring now carries a chlorine atom adjacent to its amine group.
That chlorine substitution is what makes MOCA valuable: it slows and moderates the amine's reactivity with isocyanate-terminated prepolymers, giving processors the working time and controllable cure profile needed to cast polyurethane elastomers reliably. MOCA is the long-established, industry-standard curing agent for cast polyurethane parts — rollers, industrial wheels, seals, gaskets, conveyor belting and other components valued for toughness, abrasion resistance and load-bearing performance. It also sees use as a curing agent in select epoxy-resin systems.
Where it sits in the aromatic amine family
- 4,4'-Methylenedianiline (MDA) the unchlorinated parent diamine, used mainly as the MDI precursor. See that page.
- MOCA (this product) the chlorinated analogue, valued for its moderated reactivity as a polyurethane curative.
- 2,4-Toluenediamine another aromatic diamine, precursor to toluene diisocyanate (TDI). See that page.
Appearance and handling character
MOCA is classified by the International Agency for Research on Cancer (IARC) as Group 1, carcinogenic to humans, and is a specifically regulated substance under OSHA's dedicated MBOCA standard in the United States. Controlled handling, engineering controls and medical surveillance are central to working with this material — full detail is in the Safety section below.
| Parameter | Typical value |
|---|---|
| Appearance | Tan to light-grey flake or pellet |
| Assay | 99.0% min |
| Melting point range | 104-109 °C |
| Free amine content | Within producer specification |
Important: the figures above are indicative of commercial material and are offered for planning only. The batch certificate of analysis is the governing document.
| Property | Value |
|---|---|
| Physical state | Tan to light-grey crystalline solid |
| Melting point | 104-109 °C |
| Density | 1.44 g/cm³ |
| Water solubility | Practically insoluble |
| Amine class | Chlorinated bis-primary aromatic amine |
| NFPA 704 rating | Health 2 · Flammability 1 · Reactivity 0 |
Physical constants compiled from public reference data for CAS 101-14-4 and rounded for readability. GHS-format hazard statements are not uniformly published for this substance across all reference sources; the NFPA 704 rating and IARC classification shown are the recognised substitutes. Treat all figures as orientation, not as a specification — the SDS for your specific batch governs.
Where our customers put this curative to work
The long-established curing agent of choice for cast polyurethane elastomer processing.
Cast polyurethane elastomer curing
The industry-standard curing agent for prepolymer-based cast polyurethane elastomer systems.
- Curative grade specification
- Metering-ready flake / pellet form
- Technical desk review on request
Industrial rollers & wheels
Cast into rollers and wheels prized for abrasion resistance, load-bearing strength and durability.
- Documented batch traceability
- Contract & spot supply
- Handling guidance included
Seals, gaskets & conveyor belting
Used in cast polyurethane seals, gaskets and belting valued for toughness under demanding conditions.
- Packs sized to casting-shop volumes
- Full analytical documentation available
- Retained sample held against the lot
Epoxy-resin curative
Used as a curing agent in select epoxy-resin formulations requiring its characteristic cure profile.
- Technical-grade specification
- Documented batch traceability
- Technical desk review on request
Mechanical & load-bearing components
Formulated into cast polyurethane parts used across mining, material handling and heavy-industrial equipment.
- Research & process-scale quantities
- Full documentation supplied
- Technical desk review on request
Contract & scheduled supply
Casting shops running continuous consumption are supported with scheduled, controlled-handling delivery.
- Annual contracts with scheduled call-off
- Price held across the contract period
- Second source held in reserve
How we supply MOCA (MBOCA)
Chelora Chemicals is a supplier and sourcing partner, not a manufacturer. MOCA's IARC Group 1 classification and its status as a specifically regulated substance in several jurisdictions mean controlled handling and complete documentation are central to how we manage this line.
We place your order with whichever qualified producer best matches your required grade, your price point and your delivery window, and confirm your jurisdiction's import, occupational-exposure and controlled-substance requirements before booking.
We keep a second qualified source on this line, so a single-plant disruption never becomes your casting-shop's production problem.
- Assay and melting range confirmed before we quote. Consistency matters to downstream cure performance.
- Controlled-substance documentation managed end to end. Classification, labelling and carrier compliance confirmed before booking.
- Carcinogenicity declarations filed correctly. Every shipment carries the correct hazard and regulatory declarations.
- Scheduled call-off scheduling. We hold contracted tonnage and release it against your consumption calendar.
- Batch traceability to the producing plant. Full chain of custody documentation on request.
- Export machinery handled in-house. Classification, approved packing, labelling, freight booking and customs paperwork are ours to manage.
Packed the way your casting shop receives it
Sealed drums and cartons, sized and labelled for controlled-handling requirements.
Sealed steel or fibre drums
Flake or pellet packed in sealed drums rated for this product's controlled-handling requirements.
Casting-shop-sized cartons
Sized to match metering-line consumption at polyurethane casting facilities.
Closed transfer arrangements
Transfer and handling arrangements discussed with your EHS team consistent with this product's hazard profile.
Incoterms to suit you
Quoted on the Incoterm your purchasing team works to, with documentation filed before booking.
Trial / sample quantities
Small packs dispatched for process trials before a commercial order is placed, with handling guidance attached.
Contracted call-off supply
We hold contracted tonnage and release it against your consumption calendar.
IARC Group 1 carcinogen — controlled handling required
MOCA is a specifically regulated substance, and the safety approach below reflects that. The summary is orientation only — the safety data sheet supplied with your specific batch, and your jurisdiction's controlled-substance and occupational exposure requirements, are the authoritative documents.
Recognised hazard classification
IARC 1Classified by IARC as carcinogenic to humans (Group 1).OSHARegulated in the United States under the dedicated MBOCA standard, 29 CFR 1910.1014.NFPA 2Health hazard rating 2 — intense or continued exposure could cause temporary incapacitation or possible residual injury.SKINSignificant dermal absorption potential; skin contact must be controlled.
No consolidated GHS H-code set or UN transport number is published for this substance across standard reference sources. Its hazard status is instead documented through the NFPA 704 rating and IARC classification shown here, and through the controlled-substance standard that applies in your jurisdiction. Always read the SDS issued with your specific batch and follow your site's engineering controls and medical-surveillance programme for this material.
Storage
Store in tightly closed, clearly labelled containers in a cool, dry, well-ventilated, access-controlled area, segregated from incompatible materials and from general plant traffic consistent with controlled-substance handling practice.
Handling
Use with engineered local exhaust ventilation, closed or minimised-exposure transfer, and the respiratory and dermal PPE specified for this material. Medical surveillance and training for personnel are required wherever MOCA is handled, consistent with applicable controlled-substance regulations.
Transport
We confirm and document the applicable packing, labelling, controlled-substance declarations and exact classification for your specific shipment and destination before booking.
Every batch, documented
We verify documentation before dispatch so there are no surprises at your incoming-goods bench.
Specification agreed
Assay, melting range and regulatory documentation confirmed against your process requirement before order placement.
Producer batch testing
The producing plant tests each batch against the agreed specification before release.
Documentation review
COA, SDS, controlled-substance declarations and transport paperwork checked by our desk before the shipment is booked.
Traceable dispatch
Each shipment is traceable to its producing batch, with full chain-of-custody records on request.
How MOCA is made
MOCA is produced industrially via acid-catalysed condensation chemistry analogous to MDA's, using chlorinated aniline feedstock, followed by purification to the required curative-grade assay.
We do not publish operating process parameters here; this is background only. Full technical, safety and regulatory documentation accompanies every shipment, and any process-specific detail you need is best confirmed directly with our technical desk.
| Chemical family | Chlorinated bis-primary aromatic amine |
|---|---|
| Nitrogen sites | Two primary aromatic amine groups |
| Reactivity | Moderated by ortho-chlorine substitution; reacts with isocyanate-terminated prepolymers |
| Related compounds | 4,4'-Methylenedianiline (unchlorinated parent), 2,4-toluenediamine (related diamine curative chemistry) |
Explore the wider amine range
MOCA (MBOCA), answered
What is MOCA (MBOCA) used for?
Is MOCA the same as MDA?
Is MOCA hazardous?
What grade do you supply?
What packing do you offer?
Do you manufacture this yourself?
- Need a related amine? See our 4,4'-Methylenedianiline and 2,4-Toluenediamine pages.
Get a quote on MOCA (MBOCA) today
Send us your required grade, pack size and delivery window. We will come back with a firm quote, lead time and full documentation.