BPO (benzoyl peroxide) is a peroxide used for curing amine accelerated polyester resins and fillers. It leads to rapid hardening and de-molding, even at low temperatures. It is used with our #4100 and our #4116 fairing and filling compounds. Each kit ships with black hardener. BPO is sold separately. Available Sizes and SKUs • #266-A - 1 oz tube, black • #266-B - 4 oz tube, black BPO (Benzoyl Peroxide) is a commonly used catalyst for curing resins, particularly in the context of polyester and vinyl ester resins. Here is some information about the use of BPO as a curing agent: Curing Process: BPO acts as a free radical initiator that initiates the curing reaction in resin systems. When BPO is added to the resin, it decomposes under heat, releasing free radicals. These free radicals then initiate the crosslinking reaction, causing the resin to harden and cure into a solid composite material. Mixing with Resin: BPO is typically mixed with the resin just before application. The specific amount of BPO to be added depends on factors such as the resin system, desired curing characteristics, and processing conditions. The resin guidelines and recommendations should be followed for the appropriate BPO-to-resin ratio. Temperature and Time: The curing process with BPO is usually accelerated by the application of heat. Elevated temperatures help to speed up the decomposition of BPO and the subsequent curing reaction. The temperature and time required for curing depend on the resin system and the desired properties of the final composite. Safety Precautions: BPO is a hazardous substance and should be handled with caution. It is a strong oxidizing agent and can be flammable. Appropriate safety measures, such as wearing protective gloves, goggles, and working in a well-ventilated area, should be followed. Always consult the safety data sheet (SDS) and follow the manufacturer's guidelines for proper handling, storage, and disposal. Shelf Life: BPO has a limited shelf life and can degrade over time, which can affect its effectiveness as a curing agent. It is important to check the expiration date and use fresh BPO to ensure reliable curing performance. It is important to carefully follow the resin guidelines and recommendations for the proper use and handling of BPO or any other curing agent. The specific curing parameters and processing conditions may vary based on the resin system and application requirements. The choice between white and black BPO (Benzoyl Peroxide) is primarily based on the specific requirements of the application and the desired appearance of the final product. Here are some factors to consider: Pigmentation: White BPO is typically used when a light-colored or translucent final product is desired. Since BPO can have a slight coloration, using white BPO helps minimize any potential discoloration or tinting of the resin. This is particularly important when working with light-colored or transparent resin systems. Aesthetics: White BPO is often preferred for applications where the appearance of the cured resin is critical. It helps maintain the intended color and clarity of the resin, ensuring a visually appealing final product. Visibility: Black BPO, on the other hand, is commonly used when working with dark-colored or opaque resin systems. The black color of the BPO helps blend with the dark resin, reducing any noticeable color differences in the cured composite. UV Stability: White BPO tends to offer better UV stability compared to black BPO. This can be advantageous in applications where exposure to sunlight or outdoor conditions is expected. The improved UV stability helps prevent yellowing or degradation of the cured composite over time. It is important to note that the choice of white or black BPO should align with the resin system and the intended visual appearance of the final product. Always refer to the resin guidelines and recommendations for the most suitable catalyst, including the preferred color, to achieve the desired curing and aesthetic properties. What Is BPO Hardener? BPO Hardener is a benzoyl peroxide cream hardener used to cure amine-accelerated polyester resins and fillers. BPO Hardener acts as a free-radical initiator that starts the crosslinking reaction, leading to rapid hardening and de-molding even at low temperatures. It is supplied as an easy-blend cream that mixes evenly into the base material. Why Choose BPO Hardener? For amine-accelerated systems, BPO Hardener is the matched catalyst, and its rapid cure even in cool conditions keeps production moving when temperature would otherwise slow a job. BPO Hardener is specifically used with the #4100 and #4116 fairing and filling compounds: those kits ship with black hardener included, and additional BPO is sold separately so you can replenish it as needed. The cream form blends easily for a consistent, fully initiated cure. What Are the Best Applications for BPO Hardener? BPO Hardener is designed to cure the #4100 and #4116 fairing and filling compounds and other amine-accelerated polyester resins and fillers, especially where rapid hardening and de-molding at lower temperatures are needed. How Should BPO Hardener Be Used for Best Results? BPO Hardener is blended as a cream directly into the resin or filler at the ratio specified in the product guidelines, just before application. Elevated temperatures speed the cure, so mix only what you can apply within the working time. Follow the manufacturer's recommendations for the specific system and conditions. Technical Specifications • Type: Benzoyl peroxide (BPO) cream hardener, black • Use: Cures amine-accelerated polyester resins and fillers (#4100, #4116 compounds) • Action: Free-radical initiator; rapid hardening and de-molding, even at low temperatures
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