United Initiators CUROX®I-300 Methyl isobutyl ketone peroxide 37206-20-5

CUROX® I-300 is a highly reactive liquid mixture of peroxides based on methyl isobutyl ketone, which are antisensitized by aliphatic hydrocarbons. The peroxide is used as a curing agent (free radical source) for unsaturated polyester resins. The main application is the curing of large molded parts at high temperatures (60-120°C).

Technical data.

• Appearance: Colorless liquid
• Active Oxygen Content: Approx. 10.5% w/w
• Antisensitizer: Fatty esters
• Density (20°C): approx. 0.89 g/cm³
• Viscosity (20°C): approx. 5 mPa.s
• Solubility: insoluble in water, miscible with alcohols, phthalates
• Key temperature (SADT): approx. 50°C
• Refrigeration stability: liquid below -25°C
• Starting temperature: approx. 55°C
• Recommended storage temperature: below 25°C
• Activity retention time at 25°C after delivery: 6 months
• Complies with ElektroG (EU Directives: RoHS 2002/95/EG, WEEE 2002/96/EG)

Applications.

• Polyester resin curing
• Level of use: As a curing agent for UP resins, possibly in combination with cobalt accelerators
• Temperature range: 60-120°C
• Use Level: Use 1-2% of the product in its original packaging and, if required, in conjunction with accelerator COB-1TX at 0.1-0.5%.
• Cures at room temperature, typical "hold time" for resin + peroxide is 4-8 hours.
• Holding time can be extended by lowering the storage temperature
• Resin + peroxide + accelerator "use time" is usually 1-3 hours.
• Can be extended by addition of inhibitor TC-510
• Curing Properties: Relatively long gelatin time at room temperature, but short cure time, can be combined with cobalt accelerators
• Fast curing even in the absence of cobalt above approx. 55°C ("starting temperature")
• Moderate exotherm, low internal stresses
• Moderate cure, post-cure at 80-120°C recommended
• Processing method: specially designed to provide relatively long retention times with the lowest possible starting temperatures and therefore particularly suitable for continuous impregnation of (corrugated) sheets and applied gelatine coatings as well as for fiber winding of pipes and tanks

Measurement data.

• Reactivity for curing polyester resin at room temperature: Curing after DIN 16945 at 25°C with OPA resin (20g in a test tube)
• Reactivity of polyester resin for curing at high temperatures: Curing after DIN 16945 at different temperatures with OPA resin (20g in a test tube)

Packaging.

• CUROX® I-300 comes standard in 20 kg polyethylene bottles.

Disclaimer: This information and all further technical advice reflects our existing knowledge and experience based on in-house testing using local raw materials and is intended to inform about our products and applications. This information should not be construed as a guarantee of the specific properties of the products described or of their suitability for a particular application, nor should it be construed as providing full documentation of the instructions for use. This information does not provide any warranty for the product and shelf-life characteristics, nor does it assume any responsibility or liability on our part, including in relation to existing third-party intellectual property rights (in particular patents). We reserve the right to make any changes in accordance with technological advances or further developments. Responsibility for the use and utilization of our products based on our technical recommendations lies with the user, and we have no control over their application and utilization. It is the responsibility of the user to carry out careful inspection and testing of incoming goods to verify their suitability for the intended application.