Basic Information

• Name: CUROX? SOLAR SC
• Chemical composition: 2,5-Dimethyl-2,5-di(tert.butylperoxy)hexane
• CAS No.: 78-63-7
• Form: liquid, technically pure
• Molecular mass: 290.4 g/mol

descriptive

• CUROX? SOLAR SC is a colorless flowable liquid consisting primarily of technically pure 2,5-bis(tert-butylperoxy)hexane.
• Used as an initiator (source of free radicals) for crosslinking of polymers (especially EVA), widely used in photovoltaic applications.

Technical data

• Appearance: colorless liquid
• Purity: >93%
• Active Oxygen Content (calculated): > 10.2% w/w
• No inhibitors
• Density (20°C): ~0.87 g/cm3
• Viscosity (20°C): ~7 mPa s
• Refractive index (20°C): ~1.422
• Color Index (Hazen): ~50-80
• Insoluble in water, but miscible with alcohols and esters
• Vapor pressure (50°C/80°C/110°C): 8/27/95 mbar
• SADT: ~90°C
• Refrigeration stability: freezing point below 10°C
• Recommended storage temperature: 10°C to 40°C
• Storage stability (from date of delivery): 12 months
• Complies with the European Directive on Electronic Waste Equipment (ElektroG) (EU Directives: RoHS 2002/95/EG, WEEE 2002/96/EG)
• Half-life: 10 hours/1 hour/1 minute (0.1 m/benzene): 120/142/190°C

appliance

• Peroxide crosslinker for a wide range of polymers, especially for ethylene/vinyl acetate copolymers (EVA), polyethylene (LDPE, HDPE), ethylene/propylene/(diene) rubbers (EPM, EPDM), silicone rubbers (VMQ) and fluoroelastomers.
• Crosslinking temperature: above 160°C, below 130°C no premature crosslinking occurs.
• Recommended dosage: 0.5-31 TP3T w/w supply depending on the material to be crosslinked. For some inactive polymers, the crosslinking efficiency can be improved by adding a 0.5-11 TP3T w/w synergist (e.g. TAC or EDMA).

EVA crosslinking

• CUROX? SOLAR SC can be premixed with EVA or added directly to a mixer or extruder suitable for thermoplastic materials.
• Special encapsulated EVA types suitable for low softening temperatures (below 100°C) due to their sufficient thermal stability during extrusion.
• The end product (encapsulated sheet) has long-term stability under ambient conditions, ensuring consistency in compound quality over time.
• Vacuum lamination and cross-linking is usually carried out at approx. 145°C, but CUROX? SOLAR SC requires higher cross-linking temperatures and it is recommended to use cross-linking temperatures higher than 160°C or to carry out a second baking.

Measurement data

• Table 1: Effect of peroxide dosage on torque (crosslinking speed) (viscoelastic diagram at 180°C, EVA ELVAX? 1400Z (DuPont))
• Table 2: Effect of temperature on crosslinking speed [min] (viscoelastic diagram, EVA ELVAX? 1400Z (DuPont))

Standard Packaging

• 25 kg (55.12 lb) polyethylene drums

statement denying or limiting responsibility

• The information and technical advice provided is based on in-house testing and local raw materials and is intended only to provide information about the product and its application, does not provide a warranty as to the characteristics or suitability of the product, and does not constitute a complete description of its use.
• This information does not provide a warranty for product or shelf life and does not assume any responsibility or liability for intellectual property rights, especially patents.
• We reserve the right to make any changes based on technological advances or further developments.
• The use and application of products according to our technical recommendations is beyond our control and it is the user's responsibility to scrutinize incoming items to verify their suitability.