Perkadox BTW-50 is a phthalate-free, white homogeneous paste containing 50% dibenzoyl peroxide, supplied by Nouryon for the curing of unsaturated polyester resins at ambient and elevated temperature. It has primarily been developed for the putty market and is widely selected where good chemical and physical stability are needed for tube filling. This page summarizes the specification data published for this curing paste so composite manufacturers and resin formulators can evaluate it for sourcing.
What Is Perkadox BTW-50?
Perkadox BTW-50 is a paste containing 50% dibenzoyl peroxide (CAS 94-36-0), formulated without phthalate. It is a white homogeneous paste with an assay of 48.5–51.0% and a density of 1.200 g/cm³ at 20℃. Unlike free-flowing powder peroxide grades, this curing agent is supplied as a thixotropic paste, which is part of what makes it well suited to putty and tube-fill formats where a stable, non-settling paste consistency is required.
Technical Specifications of Perkadox BTW-50
The table below lists the core specification and physical properties published for this product.
| Property | Value |
|---|---|
| Appearance | White homogeneous paste |
| Assay | 48.5–51.0% |
| Density, 20℃ | 1.200 g/cm³ |
| Viscosity, 20℃ | Thixotropic paste |
| Phthalate content | None (phthalate-free formulation) |
| CAS number | 94-36-0 (dibenzoyl peroxide) |
Curing Behavior of Perkadox BTW-50
This curing paste is used for the curing of unsaturated polyester resins at both ambient and elevated temperature. At temperatures up to 80℃, it should be used in combination with an aromatic tertiary amine accelerator, and above 80℃ the use of an accelerator is not required. The curing system formed by combining this peroxide paste with an amine accelerator produces a fast cure that is described as hardly influenced by humidity and fillers, with a relatively good cure obtained even at low temperatures.
Applications for Perkadox BTW-50
Perkadox BTW-50 has primarily been developed for the putty market, where its thixotropic paste form and stable chemical and physical properties make it well suited to organic peroxide curing of filled unsaturated polyester putty systems and tube-filled products. For non-filled systems, the manufacturer’s own documentation notes that Perkadox 40E is better suited with respect to miscibility with the unsaturated polyester resin, which is a useful reference point for formulators comparing peroxide options for a specific system.
One limitation to note when specifying Perkadox BTW-50 is that the cured, molded product can show a yellow color and comparatively poor light resistance, which should be weighed against its fast cure and good filler tolerance when the application involves a visible or UV-exposed surface. Formulators should confirm gel time and final color against their own filler package and target appearance before committing to production volume. For hidden or subsurface putty applications where color and light exposure are not a concern, this tradeoff is generally less relevant, and the fast, filler-tolerant cure profile becomes the more important selection criterion.
Handling Considerations
As with other organic peroxide curing agents, Perkadox BTW-50 should be stored, transported, and handled in line with standard organic peroxide practice: keep it away from heat, direct sunlight, and sources of contamination, and avoid mixing it directly with accelerators or reducing agents outside of the intended resin formulation. Buyers should request the current Technical Data Sheet and Safety Data Sheet from the supplier for full handling, storage temperature, and shelf-life guidance specific to their shipment and packaging format before use.
Sourcing This Curing Paste Through chemicalsstore.com
Putty manufacturers, tube-fill producers, and resin formulators sourcing Perkadox BTW-50 can contact chemicalsstore.com for current availability, supply chain resource support, and coordination on order volumes, packaging, and documentation requests, including the manufacturer’s Technical Data Sheet and Safety Data Sheet. As a Nouryon-branded organic peroxide, it can also be sourced together with related accelerators and unsaturated polyester resins to simplify procurement for a single production batch.
Frequently Asked Questions About Perkadox BTW-50
What is it made of?
It is 48.5–51.0% dibenzoyl peroxide (CAS 94-36-0) formulated as a phthalate-free, white homogeneous paste, without added liquid diluent.
Does it need an accelerator?
Only below 80℃. At temperatures up to 80℃, Perkadox BTW-50 should be combined with an aromatic tertiary amine accelerator. Above 80℃, an accelerator is not required.
What is it best suited for?
It was primarily developed for the putty market and is well suited to tube filling due to its good chemical and physical stability. For non-filled systems, Perkadox 40E is noted as better suited for resin miscibility.
Does the cured product have any drawbacks?
The molded product can show a yellow color and comparatively poor light resistance, which should be considered for applications with visible or UV-exposed surfaces.
How should it be stored?
As with other organic peroxides, keep it away from heat, direct sunlight, and contamination. Contact the supplier for the current Technical Data Sheet and Safety Data Sheet for full storage guidance.
To request current availability, technical documentation, or a formal quotation for Perkadox BTW-50, contact the chemicalsstore.com sourcing team with your target volume and application details.
