Reversol P-9941 is a non-promoted clear orthophthalic unsaturated polyester resin of high unsaturation which has good heat and chemical resistance. Reversol P-9941 is ideal for pultrusion of profiles. This resin can be used to back up other specialty resins, either to produce a combination of properties or for economy. Reversol P-9941 can be used to laminate Celmar (glassfibre backed polypropylene) and to reinforced suitably treated µPVC to upgrade the operation conditions of the material. This resin is also suitable for the fabrication of moulds for heat-assisted contact moulding and hot-press moulding processes.

Available Documents

TDS Download

Technical Informations

Application Advice/Typical Applications

(# Curing schedule was 12 hours at 25°C followed by 12hr at 50°C and 3 hours at 80°C except for Deflection Temperature where schedule was 12 hours 25°C followed by 12hr at 50°C, 3 hours 80°C and 3 hours at 120°C)

Pultrusion of profiles Back laminate on Celmar and treated PVC Tooling resins for mould construction

Shipping and Storage

To ensure maximum stability and maintain optimum resin properties, Reversol P-9941 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-9941 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 Clear yellowish  
Non-Volatile 69 ± 2
Viscosity@ 25 °C - Brookfield #3/6 800 – 1,100 cps 
Geltime @ 25°C -100g resin + 1.6 ml cobalt octoate (1%) + 2ml MEKP 10 – 15 minute 
Acid Value 35 mgKOH/g 
Specific Gravity 1.14  
Volumetric Shrinkage 8
Tensile Strength 54 MPa 
Tensile Modulus 4620 MPa 
Elongation at Break 1.5
Flexural Strength 119 MPa 
Flexural Modulus 3556 mg 
Water Absorption 24 hr at 23°C 15.9 °C 
Barcol hardness (model GYZJ 934-1) 52  

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