Home
Products
Polijel Gelcoats
Hardeners - Catalysts
Allied Chemicals for Composites
Total solution provider "One Stop Shopping" for Composites.
Product Technical Information
You can find detailed information about Poliya products at the online documents section or you can simply click the following items for information about the items on this page


Hardeners - Catalysts
Catalyst allows polyester, gelcoat and vinyl ester resins to cure by reacting with the promoter in the resin, or with heat. This starts the chemical reaction of the resin with the styrene monomer (present in the resin) allowing cross-links to form between them.
These cross-links act as braces, joining the components in the liquid resin together. When some of the cross-links have formed, the resin forms a gel and is said to be “gelled”. When most of the cross-links have formed, the resin forms a solid and is said to be “cured”.
MEKP is the most widely used in contact molding for room temperature cure other catalysts used in curing polyester and vinyl ester resins are:
Methyl Ethyl Ketone Peroxide (MEKP) – general applications for use in ambient temperature.
Benzoyl Peroxide (BPO) – for use above 80°C or in combination with an amine promoter.
Cumene Hydroperoxide (CHP) – for use above 80°C or in combination with promoters.
Acetyl Acetone Peroxide (AAP) – used where fast cure is required.
Tertiary butyl peroctoate (TBPO) – used in heat curing processes such as pultrusion and hot press molding.
Tertiary butyl perbenzoate (TBPB) – used in heat curing processes such as pultrusion and hot press molding.
Cyclohexanone Peroxide (COX) – gives a more gradual cure.


Peroxides and Hardeners for Room - Ambient Temperature
MEKP is the most widely used in contact molding for room temperature cure. It reacts with the resin to turn it from a liquid to a solid (cure it). MEKP is an organic peroxide. Since these compounds are unstable in their pure form, they are mixed with inert compounds to form the catalysts used in the industry. Due to this mixing, MEKP can be bought in various grades, which can give a range of gel times. Whilst various types of catalysts are available to cure polyester and vinyl ester resins.
MEKP allows polyester and vinyl ester resins to cure by reacting with the promoter in the resin, or with heat. This starts the chemical reaction of the resin with the styrene monomer (present in the resin) allowing cross-links to form between them. These cross-links act as braces, joining the components in the liquid resin together.
Butanox™ M-60
Methyl Ethyl
Ketone Peroxide (MEKP)
Butanox M-60 25 kg/Canister
Butanox M-60   5 kg/Canister
Butanox M-50 25 kg/Canister
MEKP is a catalyst used in the composites industry for polyester and vinyl ester resins. It reacts with the resin to turn it from a liquid to a solid (cure it). MEKP is an organic peroxide. Since these compounds are unstable in their pure form, they are mixed with inert compounds to form the catalysts used in the industry. Due to this mixing, MEKP can be bought in various grades,with varios active oxygen ratios such as M-50 or M-60 which can give a range of gel times. Whilst various types of catalysts are available to cure polyester and vinyl ester resins for room temperature cure.
Other AkzoNobel Products
  • Butanox™
  • Cyclonox™
  • Cadox™
  • Lucidol™
  • Lucipal™
  • Trigonox™
Luperox™ K-3
Acetyl Acetone
Peroxide (AAP)
25 kg/Pail
Rapid propagation from gel to peak exotherm in many resin systems. This fast curing and heat dissipation are particularly useful for continuous and semi-continuous production processes. Its high activity make it suitable during the cold season.
  • Hand Lay-up
  • Resin tranfers molding
  • Vacuum molding
  • Cold molding casting
  • Filament winding
  • Panels
  • Sheets
  • Varnishes
  • Concrete
  • Marble
Peroxan™
BP-Paste 50 PF

Dibenzoylperoxide
(BPO) Paste
25 kg/Pail
Peroxan BP-Paste 50 PF is used for the curing of unsaturated polyester resins at ambient temperature in combination with a tertiary amine accelerator.
Peroxan BP-Paste 50 PF has been developped for the curing of putties, e.g. for car repair kits, body fillers.
The curing system, Peroxan BP -Paste 50 PF in combination with an amine accelerator shows a very fast cure that is hardly influenced by humidity and fillers. Even at low temperatures a relatively good cure will be obtained. A disadvantage may be the yellow color and poor light resistance of the molded product.


Hardeners for Higher Temperatures
SMC, BMC and Pultrusion
Tertiary butyl peroctoate (TBPO) – used in heat curing processes such as pultrusion and hot press molding. Tertiary butyl perbenzoate (TBPB) – used in heat curing processes such as pultrusion and hot press molding. Cyclohexanone Peroxide (COX) – gives a more gradual cure. Benzoyl Peroxide (BPO) – for use above 80°C or in combination with an amine promoter, Cumene Hydroperoxide (CHP) – for use above 80°C or in combination with promoters.
Peroxan PK295 V
1,1-Di-(tert-butylperoxy)
-3,3,5-trimethylcyclohexane
20 kg/Canister
Peroxan PK295 V is used for the curing of unsaturated polyester resins at elevated temperatures.
Peroxan PK295 V is preferred for the curing of UP resin based hot press molding formulations in the temperature range from
120°C – 170°C.
The stability of this peroxyketal in an UP resin is hardly influenced by the presence of metal accelerators, pigments or fillers.
Peroxan PK295 V is therefore very suitable for pigmented and non-pigmented hot press moulding formulations where a long shelf life of the compound is required.
Depending on working conditions, the following peroxide dosage level is recommended: Peroxan PK295 V: 2,0 to 3,0 phr