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Identification & Functionality
- Chemical Family
- Polymer Name
- Composite Materials Functions
- Technologies
Features & Benefits
- Materials Features
- Chemical resistance
Crystic 625PA is suitable for use in process engineering chemical environments and has equal properties to those of Crystic® 491PA. Performance figures for GRP laminates made with this resin in more than 200 different chemical environments are contained in Scott Bader Technical Leaflet No. 145.3, “Safe Chemical Containment”, available on request.
Applications & Uses
- Markets
- Formulation Guidelines
Crystic® 625PA should be allowed to attain workshop temperature (18ºC - 20ºC) before use. Stir well by hand, or with a low shear mixer to avoid aeration, and then allow to stand to regain thixotropy. Crystic 625PA requires only the addition of a catalyst to start the curing reaction. The recommended catalyst is Norox® KP9, which should be added at 1% into the resin. Norox® MEKP-925H will increase the pot life. The catalyst should be thoroughly incorporated into the resin, with a low shear mechanical stirrer where possible. Crystic625PA is formulated for room temperature curing applications. It requires only addition of the correct amount of catalyst to start the curing reaction. The recommended formulations are given in Table 1:
Component Parts by weight Crystic 625PA 100 Catalysts Andonox® KP9 or Norox® MEKP-925H 1.0 - 3.0 Andonox® KP9 catalyst is suitable for general purpose use. Norox® MEKP-925H catalyst is recommended where extended pot life is required.
N.B. Peroxide catalysts are highly reactive and may decompose with explosive violence, or cause fires, if they come into contact with flammable materials, metals or accelerators. For this reason they must never be stored in metal containers or be mixed directly with accelerators.
The catalyst must be stirred thoroughly into the resin shortly before use. Curing should not be carried out at temperatures below 15ºC. Scott Bader (Pty) Ltd. will not be liable for problems caused by use at lower temperatures than recommended. The resin must be allowed to attain workshop temperature (15-30ºC) before being formulated for use.
Properties
- Color
- Typical Liquid Resin Properties
- Resin Properties - Unfilled Casting (Cured)
- Note
*Curing schedule - 24hrs at 20ºC, 3hrs at 80ºC
†Curing schedule - 24hrs at 20ºC, 5hrs at 80ºC, 3hrs at 120ºC
| Value | Units | Test Method / Conditions | |
| Viscosity (at 25°C,100 rpm, Brookfield RVT) | 700 | Centipoise | BS 2782 |
| Thixotropic Index | 1.6 | Ratio | BS 2782 |
| Specific Gravity (at 25°C) | 1.13 | — | BS 2782 |
| Volatile Content | 40 | % | BS 2782 |
| Stability (at 20°C) | 3 | Months | BS 2782 |
| Gel Time (at 25°C, using 1% Andonox® KP9 catalyst) | 20 | Minutes | BS 2782 |
| Value | Units | Test Method / Conditions | |
| Barcol Hardness (GYZJ 934-1)* | 46 | — | BS 2782 |
| Deflection Temperature (under load 1.80 MPa) †* | 110 | ºC | BS 2782 |
| Water Absorption (24h, at 23°C)* | 20 | mg | BS 2782 |
| Volumetric Shrinkage* | 8 | % | BS 2782 |
| Tensile Strength* | 70 | MPa | BS 2782 |
| Tensile Modulus* | 3400 | MPa | BS 2782 |
| Elongation (at break)* | 3 | % | BS 2782 |
Technical Details & Test Data
- Post Curing
Satisfactory laminates for many applications can be made from Crystic 625PA by curing at workshop temperature (20°C). However, in order to develop optimum heat and chemical resistance, laminates made with this resins must be post cured. After release from the mold, laminates should be allowed to mature for 24 hours at workshop temperature (20°C). They should then be post cured for a minimum of three hours at 80°C, or 15 hours at 50°C. When laminates are required to withstand temperatures between 50 and 100°C in service, the post-curing temperature should always be at least as high as that at which the laminate is required to operate. The post cure is most effective if it is carried out immediately after the 24 hour maturing period.
- Additives
Crystic 625PA can be pigmented with up to 5% Crystic Pigment Paste. Since the addition of certain pigments may affect the chemical resistant properties of laminates, users should seek advice from our Technical Service Department before making any additions
Packaging & Availability
- Packaging Type
- Packaging
- Crystic® 625PA is supplied in 25kg, 225kg drums, and 1125kg intermediate bulk containers. Bulk supplies can be delivered by road tanker.
Storage & Handling
- Storage
- Crystic® 625PA should be stored in the dark in suitable, closed containers. It is recommended that the storage temperature should be less than 20°C where practical, but should not exceed 30°C. Ideally, containers should be opened only immediately prior to use. Where they have to be stored outside, it is recommended that drums be kept in a horizontal position to avoid the possible ingress of water. Wherever possible, containers should be stored under cover.