Methyl Methacrylate (MMA), also known as MMA monomer, is a colorless, volatile liquid chemical raw material registered under CAS 80-62-6. MMA matters industrially because it is the direct building block of polymethyl methacrylate (PMMA) - the acrylic resin used in everything from construction panels to automotive lighting and medical-grade acrylic sheet - which makes MMA one of the highest-volume monomers in the global polymer supply chain. Industrially, MMA is produced through three main routes: the acetone cyanohydrin (ACH) process, the C4 oxidation process, and the newer ethylene-based process, each with different feedstocks, cost structures, and environmental profiles. This guide covers how MMA is made, the raw materials behind each production route, MMA's core applications, typical commercial-grade specifications, and what buyers should verify before sourcing MMA monomer in bulk.
What Is Methyl Methacrylate (MMA)?
Methyl methacrylate is the methyl ester of methacrylic acid, and its defining industrial role is as the monomer that polymerizes into PMMA acrylic resin. Chemically, MMA (CAS 80-62-6) has the molecular formula C₅H₈O₂ and a molecular weight of 100.12 g/mol; it exists as a colorless, highly volatile liquid with a distinctive sharp odor, a relatively low boiling point, and a low flash point - properties that directly shape how it must be transported, stored, and handled.
| Property | Value |
|---|---|
| CAS Number | 80-62-6 |
| Formula | C₅H₈O₂ |
| Molecular Weight | 100.12 g/mol |
| Appearance | Colorless liquid |
| Boiling Point | 101°C |
| Flash Point | 10°C |
How Is Methyl Methacrylate Made?
MMA monomer is manufactured through three principal industrial routes, and the choice between them largely comes down to feedstock cost, plant scale, and environmental compliance requirements rather than differences in the final product's chemical identity - commercial MMA from any of the three routes meets the same CAS 80-62-6 specification.
1. Acetone Cyanohydrin (ACH) Process
The ACH process is the oldest and most widely used commercial route to MMA, built around a reaction between acetone and hydrogen cyanide. The raw materials are straightforward: acetone and hydrogen cyanide (HCN) react to form acetone cyanohydrin, which is then converted through methacrylamide sulfate before final processing yields MMA.
The ACH route's core advantage is that it is a mature, well-proven technology with decades of operating history and broad availability of licensed process designs, which is why it remains widely used across MMA production capacity globally. Its main challenge is that the process requires handling hydrogen cyanide, a highly toxic intermediate, and generates ammonium sulfate byproduct streams that require dedicated waste treatment - both of which add safety and environmental-compliance cost relative to newer routes.
2. C4 Oxidation Process
The C4 oxidation process starts from C4 hydrocarbon feedstocks - isobutylene or tert-butanol - rather than acetone and cyanide, avoiding HCN handling entirely. The reaction proceeds through a two-step oxidation: isobutylene is oxidized to methacrolein, which is then further oxidized to methacrylic acid before esterification produces MMA.
The primary advantage of the C4 route is its suitability for large-scale production, since isobutylene and tert-butanol are available in high volumes from refinery and petrochemical streams, making this process well suited to large integrated production complexes.
3. Ethylene-Based Process
The ethylene-based process is the newest commercial route to MMA, developed specifically to reduce the waste streams associated with older technologies. Because it does not rely on hydrogen cyanide or generate the same volume of sulfate byproducts as the ACH process, the ethylene-based route offers lower waste generation and better overall sustainability, which is increasingly relevant as producers face tightening environmental regulation on cyanide handling and byproduct disposal.
Comparison of MMA Production Methods
The three production routes differ most clearly in feedstock, scale advantage, and operating challenge, which is useful context for buyers trying to understand why MMA pricing and availability can shift by region and by supplier.
| Process | Raw Material | Advantages | Challenges |
|---|---|---|---|
| ACH | Acetone + HCN | Mature technology, widely available | Cyanide handling, waste treatment |
| C4 Oxidation | Isobutylene / tert-Butanol | Suited to industrial-scale production | Feedstock availability |
| Ethylene-Based | Ethylene | Lower waste, better sustainability | Higher technology cost |
Raw Materials Used for MMA Production
Buyers researching MMA raw materials are typically evaluating supply-chain exposure - since MMA pricing tracks the cost and availability of its upstream feedstocks more closely than it tracks demand alone. The four primary raw materials feeding global MMA production are acetone, hydrogen cyanide, isobutylene, and methanol, with the specific mix depending on which production route a given plant uses. Acetone and hydrogen cyanide feed the ACH route; isobutylene (or tert-butanol) feeds the C4 oxidation route; and methanol is required across all routes as the esterifying agent that converts methacrylic acid or methacrylamide intermediates into the final methyl ester, MMA.
Methyl Methacrylate Applications
MMA's largest end-use by volume is as the monomer for PMMA acrylic sheet, but its application range extends across construction, automotive, coatings, adhesives, and medical materials, which is why MMA demand tends to track broader industrial and construction activity.
| Industry | Application |
|---|---|
| PMMA | Acrylic sheets |
| Construction | Panels and glazing |
| Automotive | Lighting components |
| Coatings | Protective coatings |
| Adhesives | Structural bonding |
| Medical | Dental materials |
MMA Monomer Grades and Specifications
Commercial MMA monomer is sold against a fairly tight specification, since even small deviations in purity or moisture can affect downstream polymerization quality in PMMA production. A typical commercial-grade MMA specification requires purity of 99.9% or higher, water content capped at 0.05%, color limited to APHA 10 or below, and the addition of an MEHQ (hydroquinone monomethyl ether) inhibitor to prevent premature polymerization during storage and transport.
| Parameter | Typical Value |
|---|---|
| Purity | ≥99.9% |
| Water | ≤0.05% |
| Color | APHA ≤10 |
| MEHQ Inhibitor | Added |
The MEHQ inhibitor specification is worth flagging separately for buyers: MMA monomer is inherently reactive and will begin to polymerize spontaneously without an inhibitor present, so any MMA quote or CoA that does not confirm inhibitor content and concentration should be treated as a specification gap, not a minor omission.
Storage and Handling Requirements for MMA
MMA's low flash point of 10°C means it must be classified and stored as a flammable liquid, which is the starting point for any storage or handling protocol. Because MMA is volatile and prone to spontaneous polymerization without adequate inhibitor protection, storage areas require controlled temperature to slow the polymerization reaction, verified inhibitor (MEHQ) content maintained throughout the storage period, and ventilation sufficient to keep vapor concentrations below flammable limits in enclosed spaces. Standard flammable-liquid handling practice - keeping MMA away from heat sources, ignition sources, and strong oxidizers - applies in addition to the inhibitor-specific monitoring that distinguishes MMA from more chemically stable solvents.
Buying Guide: How to Choose a Reliable MMA Supplier
Choosing a reliable MMA supplier requires more than comparing prices. Buyers should verify the CAS No. (80-62-6), purity, inhibitor content, and request batch-specific CoA, SDS, and TDS documents to ensure product quality and safety.
Tianjin Gnee Biotech Co., Ltd. supplies high-quality MMA monomer with complete documentation support, including CoA, SDS, and TDS. We provide flexible packaging options such as 200kg drums, ISO tanks, and flexitanks to meet different order volumes and shipping requirements.
Frequently Asked Questions
Is MMA the same as methyl methacrylate?
Yes. "MMA" is the standard industry abbreviation for methyl methacrylate, registered under CAS 80-62-6; the two terms refer to the identical compound.
What is MMA monomer used for?
MMA monomer's primary use is as the building block for PMMA (acrylic) resin, used in acrylic sheet, construction panels, automotive lighting components, coatings, adhesives, and dental materials.
How is MMA produced industrially?
MMA is produced industrially through three main routes: the acetone cyanohydrin (ACH) process, the C4 oxidation process using isobutylene or tert-butanol, and the newer ethylene-based process.
What raw materials are used to make MMA?
Depending on the production route, MMA is made from acetone and hydrogen cyanide (ACH process), isobutylene or tert-butanol (C4 oxidation process), or ethylene (ethylene-based process), with methanol required across all routes for esterification.
Is methyl methacrylate flammable?
Yes. MMA has a flash point of 10°C, which classifies it as a flammable liquid requiring standard flammable-liquid storage and handling precautions.
What purity is commercial MMA?
Commercial-grade MMA monomer is typically specified at 99.9% purity or higher, with water content ≤0.05%, color ≤APHA 10, and an MEHQ inhibitor added to prevent premature polymerization.