CRYSTIC 125 PA is a quality orthophthalic based unsaturated polyester resin developed specifically for the manufacture of GRP mouldings.

CRYSTIC 125 PA is a polyester resin of medium viscosity which meets the requirements of BS3532 : 1990, as a Type “A” resin. It can also be used for flat surface laminations.

Laminates made with Crystic 125 PA have good mechanical strength, high rigidity and impact resistance, and excellent dimensional stability. Its curing properties make it especially suitable for fast production processes when used with the recommended curing system.


CRYSTIC 125 PA may be used in the following cold curing formulations:

Parts by Weight Formulation No.1
Crystic 125 PA 100
Butanox M 50 1 – 2


CRYSTIC 125 PA requires only the addition of catalyst to start the curing reaction. It should be thoroughly dispersed
in the resin. The accelerated resin without catalyst will usually remain usable at ambient temperature (25oC) for
approximately three (3) months. Shortly before use, the correct amount of catalyst should be added and stirred
thoroughly into the mixture. When the atalyst is added to resin which has been accelerated for several days, the pot life
may be shorter than that of freshly accelerated resin.

Typical Properties of Liquid Resin

Parameters CRYSTIC 125 PA
Viscosity at 25 Deg. C CPS
(Brookfield LVF SP3, 60 RPM)
Specific Gravity at 25Deg.C 1.10
Acid Value Mg KOH/g 21
Solid Content % 59
Appearance Cloudy
Aspect Thixotropic
Stability (months) in the dark at 25oC 3
Gel time at 25 Deg.C Mins

Crystic 125 PA 100 gms
Butanox M50 2 ml


Typical Properties of Fully Cured Resins (Unfilled Casting)

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Parameters Unit CRYSTIC 125 PA
Barcol hardness (Model GYZJ 934 -1) 40
Water absorption 24 h at 23°C mg 24
Deflection temperature under Load (1.80 MPa) °C 69
Elongation at break at 20°C % 2.0
Tensile strength MPa 65
Tensile modulus MPa 3500
Flexural strength MPa 500
Flexural Modulus MPa 3800
Test methods as in BS 2782 : 1980
Cure 24 hrs at 200C and 16 hrs at 400C
Glass content % 32 After 2 hrs boil in water (tested wet)
Tensile strength MPa 122 117
Tensile modulus MPa 8500 8400
Flexural strength MPa 183 174
Fluxural modulus MPa 6300 5700
Elongation @ break % 2.0 2.0


Made with 4 layer 450g/m2 mat
Test methods as in BS 2782 : 1980[/avia_table]


It is recommended that storage temperatures should not exceed 25oC, and that containers should be stored away from
direct sunlight and not be opened until they are required for use. The shelf life of the resin under these conditions is
three (3) months.


CRYSTIC 125 PA is supplied in 225 kg steel containers. For the purpose of shipping, CRYSTIC 125 PA is class 3.0
in the IMCO Code (Page 3153)


Unsaturated polyester resins and resin systems.

The most important protective measure are:

  • Correct storage
  • Stock rotation
  • Adequate workplace ventilation
  • Fume extraction in work areas where vapour concentrations may be excessive.
  • Use of fresh air masks in confined spaces or spray applications outside of spray booths
  • Work place monitoring of vapour concentrations
  • Good housekeeping
  • Systematic work routines
  • Competent personnel
  • Supervision, training and instruction
  • Fire precautions
  • Correct disposal
  • Points of Precaution

Above certain levels monomer and solvent vapors can be hazardous to health and safety. The safety risks are
associated mainly with fire and possible explosions. The risks to health come essentially from the build up of vapors
in the workplace in excess of certain limits and the limits applicable to the users’ country should be determined. In the
UK these are known as Occupational Exposure Standard (O.E.S.) and reference should be made to the Guidance Note
EH40 from the Health and safety Executive, currently in force and available from HMSO.

The Symptoms

The symptoms of the more common vapors are similar, i.e. dry irritating throat, coughing, drowsiness and headache. Bothliquids and vapors may cause skin irritation and dermatitis to susceptible personnel.

What to do

Correct storage, stock rotation and handling will reduce safety risks. Sensible workshop lay out and systems of work
and good general and local ventilation sufficient to control the concentration of vapor below the O.E.S.’s will severely
limit or remove the health risks. Both health and safely risks can be substantially reduced by good housekeeping.

Proper procedures and equipment are important regarding respiratory matters especially when spraying is involved.
Reference should be made to BS 4275 1974 and BS 4667.

Part 3 1974 for guidance in the selection of suitable respiratory protection or to standards appropriate to the user’s

Contact with the skin must be avoided. Solvent resistant gloves and suitable protective clothing should be worn when
handling resin solutions; the solvents have a defatting action that leaves the skin prone to irritation and dermatitis.

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