Perkadox GB-50L is a granular dibenzoyl peroxide curing agent supplied by Nouryon, containing 50% active peroxide content in a free-flowing powder carrier. It is formulated for curing unsaturated polyester and (meth)acrylic resin systems at ambient and elevated temperature, and is widely specified where a clear, high-transparency cured part is required. This page summarizes the specification data published for this curing agent so composite manufacturers and resin formulators can evaluate it for sourcing.
What Is Perkadox GB-50L?
Perkadox GB-50L is a free-flowing, fine, granular powder containing 50% dibenzoyl peroxide (CAS 94-36-0), with a maximum water content of 0.5%. It dissolves clearly in the resin system, which makes it especially suitable for producing cured parts with acrylic resins when a high degree of optical transparency is needed, such as cast sheet, signage, and clear composite parts. The active content and low water level are what distinguish this grade from lower-assay dibenzoyl peroxide powders offered for less demanding cure profiles.
Technical Specifications of Perkadox GB-50L
The table below lists the core specification and handling properties published for this product.
| Property | Value |
|---|---|
| Appearance | White free flowing powder |
| Assay (active peroxide) | 49.0–51.0% |
| Water content | ≤ 0.5% |
| Bulk density | 640 kg/m³ |
| Density | 1.322 g/cm³ |
| Poured bulk density | 711 kg/m³ |
| Tapped bulk density | 766 kg/m³ |
| CAS number | 94-36-0 (dibenzoyl peroxide) |
These bulk density figures (loose, poured, and tapped) are relevant to how a formulator plans powder metering, feeder calibration, and packaging volume, since a granular peroxide of this density behaves differently in automated dosing equipment than a fine talc-like powder or a liquid/paste peroxide.
Curing Behavior of Perkadox GB-50L
This curing agent is used for the curing of unsaturated polyester and (meth)acrylic resins at both ambient and elevated temperature. At temperatures up to 80℃, it should be used in combination with an aromatic tertiary amine accelerator to achieve a practical cure rate. Above 80℃, the use of an accelerator is not required, since thermal energy alone is sufficient to decompose the peroxide and initiate the curing reaction. This dual-mode behavior gives formulators flexibility to match Perkadox GB-50L to the specific process temperature of their production line, whether that is a cold-cure ambient process or a heated mold or oven cure.
Applications for Perkadox GB-50L
Because it dissolves clearly into the resin matrix rather than leaving visible residue, this product is commonly selected for organic peroxide curing applications where part clarity is a requirement, including cast acrylic sheet, clear coatings, and transparent or lightly tinted composite parts made with unsaturated polyester resin. It is also used in general unsaturated polyester curing where a granular, free-flowing peroxide is preferred for ease of metering and handling compared with liquid or paste peroxide forms. Formulators producing artificial stone, cast panels, or clear laminate parts can evaluate Perkadox GB-50L alongside their existing accelerator package to confirm gel time and exotherm profile for their specific resin system before scaling to production volume.
Handling Considerations
As with other organic peroxide curing agents, this product 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 Agent Through chemicalsstore.com
Composite manufacturers, cast acrylic producers, and resin formulators sourcing this curing agent 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 GB-50L
What is Perkadox GB-50L made of?
It is 49.0–51.0% dibenzoyl peroxide (CAS 94-36-0) carried on a free-flowing powder base, with a maximum water content of 0.5%.
Does Perkadox GB-50L need an accelerator?
Only below 80℃. At temperatures up to 80℃, it should be combined with an aromatic tertiary amine accelerator. Above 80℃, an accelerator is not required.
Why choose it for clear resin parts?
Perkadox GB-50L dissolves clearly into the resin system rather than leaving visible residue, which is why it is often selected when a high degree of optical transparency is required in the cured part.
What is its bulk density?
Bulk density is approximately 640 kg/m³, with poured bulk density around 711 kg/m³ and tapped bulk density around 766 kg/m³.
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 GB-50L, contact the chemicalsstore.com sourcing team with your target volume and application details.
