Perodox® HMa - Methyl isobutyl ketone peroxide

Methyl Isobutyl Ketone Peroxide (MIBKP) is an organic peroxide, specifically a ketone peroxide, widely used as a free-radical initiator and crosslinking agent in the polymerization and curing of unsaturated polyester resins (UPR) and other thermosetting plastics.

The CAS Registry Number for Methyl Isobutyl Ketone Peroxide is 37206-20-5.

The molecular formula of Methyl Isobutyl Ketone Peroxide is C12H26O4.

The primary use of MIBKP is as a curing agent and initiator for unsaturated polyester resins, which are used in the production of fiberglass-reinforced plastics (FRP), coatings, and composite materials.

No, Methyl Isobutyl Ketone Peroxide is a ketone peroxide, not an ester peroxide. Its chemical structure is derived from methyl isobutyl ketone and hydrogen peroxide.

MIBKP is typically supplied as a clear, colorless to pale yellow liquid.

The molecular weight of Methyl Isobutyl Ketone Peroxide is approximately 234.33 g/mol.

Methyl Isobutyl Ketone Peroxide typically has an active oxygen content around 8.4%.

MIBKP should be stored in a cool, well-ventilated area, away from heat, sparks, and flames. It is often recommended to store it at or below 25°C (77°F).

The Self-Accelerating Decomposition Temperature (SADT) for MIBKP is typically around 55°C (131°F).

Key applications include the curing of unsaturated polyester resins in the manufacture of marine parts, automotive components, construction panels, pipes, tanks, and cultured marble.

Necessary safety precautions include using personal protective equipment (PPE) like safety glasses and gloves, ensuring adequate ventilation, avoiding contact with skin and eyes, and keeping away from incompatible materials like strong reducing agents.

Yes, as an organic peroxide, MIBKP is classified as a hazardous substance and should be handled with care.

The UN number for Methyl Isobutyl Ketone Peroxide is typically UN 3105 (Organic peroxide type D, liquid).

Yes, MIBKP is often used with promoters or accelerators (like cobalt salts) to achieve room temperature curing of polyester resins.

Methyl Isobutyl Ketone Peroxide has a flash point of approximately 48°C (118°F).

MIBKP generally offers a different curing profile compared to MEKP. It can provide a better balance of gel time and cure speed in certain resin systems and is often chosen for specific application requirements.

MIBKP is incompatible with strong acids, bases, oxidizing agents, reducing agents, and polymerizing contaminants. Contact can lead to fire or explosion.

The shelf life of MIBKP varies by manufacturer and storage conditions but is typically around 6 to 12 months when stored properly in its original, unopened container.

The density of Methyl Isobutyl Ketone Peroxide is approximately 0.99 g/cm³ at 20°C.

For room temperature curing, yes, an accelerator such as cobalt octoate is commonly used. For high-temperature curing, an accelerator may not be necessary.

The main industries include the marine industry (boat hulls), transportation (automotive parts), construction (panels, sanitary ware), and chemical industry (tanks, pipes).

MIBKP is typically classified under GHS for organic peroxides (Type D), which includes hazards like causing fire or explosion if heated under confinement.

It is commonly supplied as a phlegmatized (desensitized) solution, often in high-density polyethylene (HDPE) containers or drums.

In case of eye contact, immediately flush eyes with plenty of water for at least 15 minutes, holding eyelids open. Seek immediate medical attention.

Use water spray, alcohol-resistant foam, dry chemical, or carbon dioxide. Firefighters should wear self-contained breathing apparatus and full protective gear.

Yes, MIBKP can cause skin irritation and may be harmful if absorbed through the skin.

MIBKP may be toxic to aquatic life. Spills should be contained to prevent environmental contamination.

MIBKP is a mixture of peroxides and does not have a well-defined boiling point. It will decompose before boiling.

Disposal must comply with local, regional, and national regulations. Often, it should be handled by a licensed chemical waste disposal company. Incineration may be an option under controlled conditions.

The vapor pressure of MIBKP is generally low.

MIBKP has limited solubility in water but is miscible with many organic solvents like esters, ketones, and aromatic hydrocarbons.

MIBKP is a liquid with a viscosity that can vary depending on the specific formulation and phlegmatizer used.

Recommended PPE includes chemical-resistant gloves, safety goggles or a face shield, and protective clothing to prevent skin contact.

It is regulated for transport as a Class 5.2 Organic Peroxide (UN 3105, Packaging Group II). Specific regulations depend on the mode of transport (air, sea, road, rail).

Increasing temperature significantly increases the decomposition rate and radical generation of MIBKP, accelerating the curing process. Storage at high temperatures must be avoided to prevent dangerous decomposition.

Decomposition products include gases like carbon monoxide, carbon dioxide, and potentially flammable hydrocarbons.

Generally, no, unless the specific MIBKP grade and the fully cured resin system have been explicitly approved for food-contact applications by relevant authorities (e.g., FDA).

MIBKP is not characterized by a pH in the traditional sense, as it is an organic peroxide, not an aqueous solution.

The activity is primarily measured by its active oxygen content, which can be determined analytically, for example, by iodometric titration.

MIBKP is a ketone peroxide used primarily for curing unsaturated polyesters, often at room temperature with a promoter. BPO is a diacyl peroxide used for curing polyesters and acrylics, often requiring heat or a different type of accelerator (e.g., amines).

Evacuate the area. Wear appropriate PPE. Contain the spill with inert, non-combustible absorbent material (e.g., sand, vermiculite). Place in a suitable container for chemical waste. Prevent entry into sewers or waterways.

MIBKP itself has low volatility, but the solvent it is often dissolved in (e.g., dimethyl phthalate) may contribute to VOC emissions.

The recommended concentration typically ranges from 1% to 2.5% by weight of the resin, but the optimal amount should be determined experimentally for the specific resin system.

While its primary use is with polyesters, MIBKP can be used as an initiator for other monomer and resin systems, including some acrylics, depending on the required curing profile.

The induction time (gel time) depends on the resin system, accelerator concentration, and temperature. It must be determined for each specific application.

Ketone peroxides like MIBKP can contribute to yellowing, especially if the resin is over-accelerated or exposed to heat/UV light. The effect is generally less pronounced than with amine-promoted systems.

This is a specific technical parameter related to explosive properties. The exact oxygen balance value for MIBKP should be obtained from the manufacturer's detailed safety data.

MIBKP is stable under recommended transportation conditions (cool, away from heat and ignition sources), thanks to being phlegmatized. It is classified for transport with specific requirements to ensure safety.

Major global producers of organic peroxides, including MIBKP, include companies like Nouryon, United Initiators, and Arkema. Specific product names include Trigonox HMa from Nouryon.

It is recommended to handle MIBKP at temperatures below 30°C (86°F) to minimize risks.

Yes, MIBKP is suitable for use in transparent gel coats and resin systems.

The heat of decomposition is a key parameter for safety assessments. The specific value should be obtained from the manufacturer's technical data or safety data sheet.

MIBKP should be protected from moisture, as water contamination can affect its performance and stability.

Other ketone peroxides like MEKP or cyclohexanone peroxide, or different classes of initiators like peroxyesters, can be substitutes, but the choice depends on the required curing characteristics and final properties of the product.