Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Composite Materials Functions
- Technologies
- Product Families
Features & Benefits
- Materials Features
Applications & Uses
- Applications
- Composites Processing Methods
- Applications
Crystic Topcoat 402PA is designed for application to the back of GRP moldings, as a decorative, protective coating for the laminate. It will resist mild chemical attack from cleaning agents, etc, but it is not designed for use on the inner surfaces of vessels holding water. For such an application, Crystic Topcoat 507PA is recommended.
- Application Guidelines
- Crystic Topcoat 402PA is designed for application by brush or roller to the back of GRP laminates in order to protect the fibers from water attack and to provide an attractive finish. Coverage is affected greatly by the evenness of the laminate.
- Measures taken to achieve a smooth finish, such as sanding or the use of surface tissue, will reduce the amount Crystic Topcoat 402PA required to cover the surface. In normal use, the application of should be controlled to 0.5-0.6 mm wet film thickness. As a guide, approximately 600-800 g/m2 of topcoat mixture will give the required thickness when evenly applied.
- Pot Life
The temperature, and the amount of Catalyst M or O affect the geltime, and hence the pot life of Crystic Topcoat 402PA. The below table shows geltime in minutes of Crystic Topcoat 402PA at varying temperatures.
Catalyst Type Andonox® KP9 Norox® MEKP-925H Catalyst Addition 1% 2% 3% 1% 2% 3% Temperature Geltime In Minutes 15ºC Combination not recommended. 16 14 Combination not recommended. Combination not recommended. Combination not recommended. 25ºC 10 8 Combination not recommended. 19 9 7 35ºC 5 4 Combination not recommended. 8 5 4 The topcoat, molding and workshop should all be at or above 15°C before curing is carried out. Scott Bader (Pty) Ltd. will not be liable for problems caused by use at lower temperatures than recommended.
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.- Formulation Guidelines
- Crystic Topcoat 402PA should be allowed to attain workshop temperature (18ºC-20°C) before use. Stir well by hand, or with a low shear mixer to avoid aeration, and then allow to stand to regain thixotropy. Crystic Topcoat 402PA requires only the addition of catalyst to start the curing reaction. The recommended catalyst is Andonox® KP9. This should be added at 1-3% into the Flowcoat. In hot weather, the pot life can be so short even with 1% Andonox® KP9 catalyst that it is difficult to avoid the material gelling in the pot. Do not use less than 1% Andonox® KP9 catalyst. Rather use Norox® MEKP-925H. The catalyst should be thoroughly incorporated into the Flowcoat, with a low shear mechanical stirrer where possible.
Properties
- Uncured Properties
| Value | Units | Test Method / Conditions | |
| Viscosity (at 25°C, Brookfield RVT, 100 rpm) | 4000 | Centipoise | — |
| Specific Gravity (at 25°C) | 1.307 | — | — |
| Gel Time (at 25°C, using 2% Andonox® KP9 Catalyst) | 8 | Minutes | — |
| Stability (in dark at 20°C) | 3 | Months | — |
| Thixotropic Index | 4.5 | Ratio | — |
Technical Details & Test Data
- Additives
- The addition of fillers to Crystic Topcoat 402PA can adversely affect the water and scuff resistance of the cured topcoat. It may be pigmented to a range of shades using Crystic Pigment Pastes. Should white topcoat be required, Crystic Topcoat 407PA White is recommended.
Packaging & Availability
- Packaging Type
- Packaging
- Crystic Topcoat 402PA is supplied in 25Kg and 225Kg containers.
Storage & Handling
- Storage
- Crystic Topcoat 402PA should be stored in the dark in suitable, closed containers. It is recommended that the storage temperature should be less than 20ºC where practical, but should not exceed 30ºC. 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.