Reversol P-9539 NW is a rigid, low reactivity, low viscosity, non-waxed, thixotropic, economy general purpose orthophthalic unsaturated polyester resin. It is pre-promoted for ambient temperature cure with addition Methyl Ethyl Ketone Peroxide (MEKP) as catalyst. This resin is as tough as RP9509 with slightly poorer fibre wetting during handlay. Gel, cure and demoulding times are sensitive and dependent on catalyst used and temperature of environment. Generally, use more catalyst on a cold/rainy environment and less on a hot day. FEATURES Suitable for spray-up and hand lay-up application Slower wetting of glass fibre and with easy air release during rollout

Available Documents

TDS Download

Technical Informations

Application Advice/Typical Applications

General fibreglass-reinforced fabricated parts. Marine and other structural fibre reinforcement application.

Shipping and Storage

To ensure maximum stability and maintain optimum resin properties, Reversol P-9539 NW should be stored in closed containers below 32°C and away from heat sources and sunlight. All storage should conform to local fire and building codes. Drums should be stored away from all sources of flame or combustion. Inventory should be maintained at minimum reasonable stock and used on a first-in-first-out basis. When properly stored, Reversol P-9539 NW will remain stable for 3 months from date of delivery.

Product Security/Health and Safety

Before handling, please read the Safety Data Sheet of this product for advice on safety, use and disposal.

Effluents and Pollution Control

Before handling, please read the Safety Data Sheet of this product for advice on safety, use and disposal.

For further information regarding this product please refer to:

Synthomer Limited Head Office
Phone: +44 (0)1279 436 211
FAX: +44 (0)1279 444 025


Character Value Unit
Appearance Hazy; pinkish  
Non-Volatile 54.5 ± 1.5
Viscosity@ 25ºC - Brookfield, #3/60 300-450 cps 
Thixotropic Index 1.05 minimum  
Geltime @ 25ºC - 1% MEKP 25-35 minute 
Specific Gravity 1.12  
Acid Value 32 mg KOH/g 
Volumetric Shrinkage 8
Tensile Strength 52 MPa 
Tensile Modulus 3358 MPa 
Elongation at Break 1.6
Water Absorption 24 hr at 25 ºC 18 mg 
Deflection Temperature (load 1.80 MPa) 59 °C 
Barcol Hardness (Model GYZJ 934-1) 42  

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