General Purpose Resin

Product Features & Benefits:

The general purpose polyester resin is a quick curing unsaturated polyester resin based on Orthophthalic raw material for laminating purpose. It is un-accelerated. Suitable for both hand lay up and gun spray up. The resin offers excellent mechanical properties, impact and water resistance. The glassfibre laminate made with this resin has excellent mechanical strength, good rigidity and outstanding durability.

Typical Applications ( General Purpose Resin ):

  • Automobile Components
  • Flower pot
  • Sports Equipments
  • Safety Helmet
  • Dust Bin
  • Water Tank
  • Garden Furniture
  • Bath Tub
  • Container
  • Panels
  • Machine Cover
  • Statues

Physical data in liquid state at 250C# [Confirm to IS 6746-1994 and BS 3532 - 1990]

Properties Units Values Test Standards
Appearance - Pale Yellow (TM-01)
Specific Gravity - 1.13 ± 0.02 (TM-11)

  • Ford Cup 4 @ 300C
  • Brookfield RVT model #

mPa s(cps)

120 ± 20

600 ± 100



Volatile Content % 33 ± 2 (TM-08)
Acid Value mg-KOH/gm 25 ± 3 (TM-06)
Gel time @ 300C Minutes


15 - 25*

10 - 15ω

Peak Exotherm Temp. 0C 145 - 165 (TM-07)
  • * Using Accelerator, Co (2%) 1 ml, Catalyst, MEKP1.5ml, the gel time, cure time and Peak Exotherm measured.
  • * Summer Winter [TM - Test Method as per ISO-9001-2000-DOC-REV-03]

Properties of cast Resin Laminate:

Properties Units Values Test Standards
a) Barcol Hardness BHU 40* ASTM D - 2583
b) Heat Distortion Temp. 0C 70 ± 5 ISO - R75
c) Specific Gravity - 1.20 ± 0.02 ISO - R1183
d) Volume Shrinkage on cure % 7 - 8 ISO - 3521
e) Tensile Strength N/ 55 ± 5 ISO - R 527
f) Tensile Modulus N/ 3100 ± 100 ISO - R 527
g) Elongation at break % 1.5 - 2.5 ISO - R 527
h) Flexural Strength N/ 80 ± 10 ISO - 178
i) Flexural Modulus N/ 3200 ± 100 ISO - 178
  • * When post cured after maturation.


The general purpose polyster resins performs best if the laminate is completely post cured. The quantity of catalyst and accelerator can be adjusted to get a shorter or longer gel time. The accelerator must be completely mixed before catalyst is added in order to avoid a direct blending which may cause an explosion.

Post Curing:

It is recommended to mature the products for 24 hours and post curing should be done for minimum of three hours at 800C, or 2-3 weeks at room temperature. This is essential for getting the optimum properties.

Storage / Handling:

The polyester resin remains stable for 3 months at 300C in the dark and 4 months at 250C. The resin stability deteriorates markedly at elevated temperature, especially when exposed to direct sunlight. espol 12.00 has a flash point of 340C and is classified as flammable. "NO SMOKING " rules should be strictly followed. In case of spillage, use sand or earth to absorb and shovel off for disposal as per local regulations, In case of fire, use dry chemical foam, Carbon dioxide or water spray to extinguish the flame.


The Polyester resin is packed in HDPE carboys ( 30, 35, 40 & 45 kgs ) and epoxy coated steel drums HDPE barrels ( 220 kgs ) of standard size net weight. Special packing size offered for projects on returnable containers. Technical services are also provided to comply standards.

Health & Safety:

Never add metal salts ( Accelerator ) or Pre Acceleratorated resin to Peroxides when adding peroxides to a resin solution, mix thoroughly the resulting product Do not add organic peroxides to a hot diluents or process. Prevent contamination of Accelerator, promoter from materials like ( Iron Copper, Cobalt ) salts, storing acids and sanding dusts. Suggested containers are glass, polypropylene, Teflon, Poly-ethylene or stainless steel to prevent contamination of material during its handling.