Hardeners and Catalysts

Hardeners are chemicals which are activated by accelerators or heat and promote gelling and curing of a polyester resin vinyl ester resin matrix. They start crosslinking reactions between resin and reactive monomers such as styrene. Methyl ethyl ketone peroxide (Mek-P) is active at room temperature for curing of polyesters and vinyl esters. Tert-Butyl peroxybenzoate (TBPO) is the preferred choice for heat curing productions such as pultrusion and hot press. Benzoyl Peroxide (BPO) is active over 80°C and also is used with amine accelerators at ambient temperature for hardening systems. Acetyl Acetone Peroxide (AAP), with its fast demolding time, is preferred choice for RTM. Phthalate free grades are recommended where needed. 

Döküm Tipi Hardeners are chemicals which are activated by accelerators or heat and promote gelling and curing of a polyester resin vinyl ester resin matrix.
Commercial Name Chemical Name / Structure Room Temperature Medium Temperature High Temperature VE
    Active Oxygen % *SADT Value °C Hand lay-up
RTM Polymer Concerete Gelcoat Amine Accelerated Putty Chemical Bolting
Button  Centrifugal Casting Filament Winding Continuous Laminate Pultrusion SMC-BMC Engineered Stone Vinyl ester
  Ketone Peroxides                                
Butanox M60 Methyl ethyl ketone peroxide 9,9 60          
Luperox K10 Methyl ethyl ketone peroxide 9,9 60          
Butanox M50 Low Reactivity Methly ethyl ketone peroxide 8,9 60          
Butanox M50-A Methly ethyl ketone peroxide (phthalate free) 8,8 60                    
Luperox K1-G Methly ethyl ketone peroxide (phthalate free) 9,2 60                    
Trigonox 44-B Acetylacetone Peroxide 4,1 60                
Luperox K-3 Acetylacetone Peroxide 4,1 60                
Butanox LPT Low Reactivity Methyl ethyl ketone peroxide 8,5 60                  
Luperox Z11-G Methly ethyl ketone perox. + Acetyl Acetone perox. 7,5 60                    
  Benzoyl Peroxides                                
Peroxan BP Paste F Dibenzoyl peroxide 3,3 55                        
Trigonox C tert. Butylperbenzoate 8,0 60                      
Trigonox 93 tert. Butylperbenzoate 6,5 55                      
Trigonox 29-C50 1,1-Di(tert-butylperoxy)-3,3,5-trimethylcyclohexane 5,3 60                        
Trigonox 29-B50 1,1-Di(tert-butylperoxy)-3,3,5-trimethylcyclohexane 5,3 60                        
Peroxan PK-295V 1,1-Di(tert-butylperoxy)-3,3,5-trimethylcyclohexane 5,3 60                        
Trigonox 239 Cumylhydroperoxide 4,6 60                          


Organic peroxides are unstable products which may undergo self-accelerating decomposition. It is strongly recommended to store at under 25°C (or at specific temperature stated by peroxide producer), in a dark place. Keep peroxides away from accelerators and promoters.
Users should add accelerators and promoters into the resin first. Then, after thoroughly mixing, add peroxides into the system.

*SADT (Self Accelerating Decomposition Temperature).

Modification Description

  • FR   Filled flame retardant
  • D*   Filled (*with filler content)
  • T Thixotropic (no sagging)
  • A Cobalt preaccelerated
  • ABP Amine preaccelerated
  • UV UV Curing
  • L   UV light stabilized
  •   I Lower viscosity
  •   V Higher viscosity
  •   LSE   LSE (low styrene emission)
  •   H* Gel time customized (at room temperature) * minutes
  • H40 Optimized for summer season. Gel time (at room temperature) 40 minutes.
  • H20 Optimized for winter season. Gel time (at room temperature) 20 minutes.
  •   COLOR   White or custom color options

Gelcoat Customizations
Polijel gelcoat table descriptions and modifications.

  • Spray Application (airless preferred)
  • Brush or Roller Application
  • Color Option: White colored
  • Color Option: Light colored (pastel)
  • Color Option: PRO colored

Production Quantity Depending on Process (parts/year)
Regardless of product dimension and complexity..

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