Perovion AAP-TBPB L27 is an organic peroxide blend combining acetylacetone peroxide (AAP) and tert-butyl peroxybenzoate (TBPB), formulated for curing unsaturated polyester and vinyl ester resins under ambient and elevated temperature conditions. When used in conjunction with a metal accelerator, this AAP TBPB peroxide blend initiates the crosslinking reaction in thermoset resin systems, supporting consistent cure across a range of composite manufacturing processes.
Key Features
- Organic peroxide blend combining acetylacetone peroxide (AAP) and tert-butyl peroxybenzoate (TBPB) for polyester and vinyl ester curing.
- Dual-peroxide formulation provides initiation activity across ambient and elevated processing temperatures.
- Suitable for curing in conjunction with a cobalt or other metal accelerator system.
- Applicable in GRP laminating, composite panel fabrication, and general thermoset processing.
- Intended for industrial and professional use only.
Typical Applications
Perovion AAP-TBPB L27 can be applied in curing unsaturated polyester and vinyl ester resin systems, including composite laminates, GRP fabrication, and thermoset processing applications where a dual-temperature initiation profile is required. The combination of AAP and TBPB peroxide chemistry makes this blend suitable for both ambient-initiated processes and systems requiring additional elevated-temperature through-cure.
Technical Specifications
- Chemical Type: Acetylacetone Peroxide (AAP) and tert-Butyl Peroxybenzoate (TBPB) blend
- Appearance: Clear liquid (color ≤100 Pt-Co/APHA max.)
- Total Active Oxygen: 4.3-4.7%
- Density at 20°C: 1.054 g/cm³
- Viscosity at 20°C: Low-viscosity liquid (data not specified by manufacturer)
Thermal Stability
- Organic peroxides are thermally unstable substances and must be handled with appropriate care.
- SADT: 60°C
Decomposition Products
Under normal storage and use, Perovion AAP-TBPB L27 decomposes to release carbon dioxide, benzoic acid, tert-butanol, acetone, benzene, methane, ethane, diphenyl, acetylacetone, aliphatic acids, and water. These decomposition products should be considered when assessing ventilation and fire response requirements for storage areas holding this organic peroxide blend.
Why a Dual-Peroxide Blend
Combining acetylacetone peroxide (AAP) with tert-butyl peroxybenzoate (TBPB) in a single formulation gives formulators an initiator system that spans two distinct reactivity ranges rather than relying on a single peroxide chemistry. AAP contributes fast, cobalt-accelerated gel and cure at ambient to moderately elevated temperatures, while TBPB extends activity further into the elevated-temperature range used in continuous laminating and centrifugal casting.
This blended reactivity profile is why Perovion AAP-TBPB L27, used together with a cobalt accelerator, is well suited to processes such as resin transfer molding and filament winding, where the resin must gel promptly at the start of the cycle and then continue curing through to a fully hardened part as the process moves into its elevated-temperature stage.
Storage Recommendations
- Recommended maximum storage temperature: 25°C (Ts max.); minimum -5°C (Ts min.) to prevent crystallization
- Store in a dry, well-ventilated area away from heat sources and direct sunlight.
- Keep containers tightly closed.
- Avoid contact with reducing agents, acids, alkalis, and heavy metal compounds.
Related Perovion Peroxide Systems
Innovexar offers several organic peroxide products for unsaturated polyester and vinyl ester curing beyond the AAP-TBPB dual-blend chemistry. Where a single-peroxide system or a different reactivity profile is preferred, formulators can compare Perovion AAP-TBPB L27 against related grades in the Perovion organic peroxide range to identify the best fit for a given resin system, section thickness, and cure schedule.
Cobalt Accelerator System
Perovion AAP-TBPB L27 is designed to be used together with a cobalt accelerator, most commonly a cobalt octoate or cobalt naphthenate solution supplying approximately 1% cobalt metal. The cobalt accelerator reacts with the AAP component to generate free radicals rapidly at room temperature, initiating the gel stage of the cure.
As the exotherm from the initial AAP-cobalt reaction raises the resin temperature, the TBPB component becomes active and drives the cure through to a fully hardened part. This two-stage mechanism is what allows a single peroxide package to cover both the gel and cure phases of the process without needing a separate high-temperature post-bake step in many applications.
Accelerator dosage, peroxide dosage, and ambient temperature should be adjusted together during process qualification, since cobalt accelerator level has a strong influence on both gel time and peak exotherm temperature. Formulators typically run bench-scale gel time and exotherm trials before scaling a new resin-accelerator-peroxide combination to production.
Process Considerations
Because Perovion AAP-TBPB L27 is supplied as a ready-to-use blend rather than two peroxides dosed separately, the AAP-to-TBPB ratio is fixed at the point of manufacture. This simplifies dosing on the shop floor, since operators work with a single metered addition rather than coordinating two separate peroxide streams with different activity profiles.
Typical dosage levels for continuous laminating, resin transfer molding, filament winding, and centrifugal casting are established during process qualification and depend on the specific resin system, ambient temperature, section thickness, and target gel and cure times. As with any organic peroxide system, trial batches at production scale are recommended before committing to a fixed dosage for a new application.
Packaging & Transport
- Standard Packaging: 25 kg container
- Net Weight: 25 kg
- UN Number: UN 3107
- Transport Class: Organic peroxide type E, liquid, Division 5.2
Safety & Handling
Perovion AAP-TBPB L27 should be handled in accordance with applicable safety procedures for organic peroxides. As with all organic peroxide products, appropriate personal protective equipment and safe storage conditions are required.
Safety Data Sheet and destination-compliant labeling information should be reviewed before use and are available upon request. For related organic peroxide initiators used in polyester curing, see also Perovion MEKP L50R and Perovion TBPB LC.