Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
- Product Families
- Components
- EPWA27-A and EPWA27-B
- May be thinned with MEK (methyl ethyl ketone).
Features & Benefits
- Ready-to-Use Product Features
Applications & Uses
- Markets
- Applications
- Uses
- Uses included the engine rings of the AB-8B Harrier.
- Used in fan track linings where grooves are machined into the material; this is common in the compressor case area as ‘knife seals’ as it is denser then materials used in other areas.
- Processing
Processing of EPWA27 for Rolls Royce machinery is given in RPS 340/1. This data is evolved from the original use of the material on the Pegasus engine. The material will fully cure at room temperature; 90 - 95 % cure is achieved after 24 hours at typical working temperatures; the final 5 - 10 %of the cure will take place over the next few days. Provided that ambient temperatures are not too low, EPWA27 will be sufficiently cured after 24 hours to be fully resistant to solvents and cutting oils. EPWA27 is designed not to slump and thus allows faster application into thicker, deeper grooves.
- Application
Surface Preparation
- Dry abrasive blast using 120/220 grade Aluminum Oxide grit. Ensure all dust is removed from the substrate prior to primer or EPWA27 application
- Baking epoxy primer or ambient cure 2pk Epoxy may be used as a base for EPWA27. Refer to OEM requirements before selecting primer to choose a direct to metal application.
- Direct to metal applications must be validated by the user before use.
- Suitable Primers, 700-155-003, IP9064-6362 (chromate options), IP985-6500, IP9064-6500, IP3-6700 (non-chromate options)
- The baking primer must be part-baked in line with the manufacturer’s recommendations for coating systems that are made up of multiple paint layers.
Paint Preparation
- EPWA27 is a two-part mix with a 2:1 part A to B mix ratio by weight.
- The product must be thoroughly mixed at ambient temperature before use. The mixing of large volumes can be problematic due to the thickness of the material and the exothermic reaction between parts A and B. Mixing small amounts per application is the most effective method of use.
- The final layer of EPWA27 may be thinned in the ratio 100g mixed EPWA27 to 10 - 15 cc of MEK. This procedure allows the final layer to achieve a smoother initial profile prior to any finishing /machining operations.
Application Method
- EPWA27 is applied by spatula that is used to press the coating onto the substrate and into groves.
- The work piece may be heated up to a limit of 60oC prior to application. The heat from the substrate has been found to help substrate wetting and flow of the coating.
- Multiple applications will be required to achieve thick film builds.
Drying Curing
The EPWA27 coating may be cured at ambient temperature or a heated process.
Drying process options:
- 24 hours at room temperature (18 - 23 °C)
- 3 hours at 65 - 75 °C
- 1 hour at 95 - 105 °C
- 1.5 hours at 92 - 108 °C
- Solvent/Cleanup
40006 Gun Cleaner
Properties
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Hardness | 72 - 75 | Shore D | ASTM D2240 |
| Supply Viscosity | Ready for Use | - | - |
| Flash Point | min. 200oC | °C | - |
| VOC Content (As Supplied Mix) | 0.0 | g/l | - |
| Density (Mixed) | 1.08 | g/ml | - |
| Catalyst | 2 Part Kit | - | - |
| Theoretical Coverage (100 Micron) | 9.2 | sq.m/kg | - |
Regulatory & Compliance
- Approvals/Specifications
- MSRR 9316
- RPS 340/1
Technical Details & Test Data
- Performance
- Oil, Grease, Resistant attrition coating.
- Cured coating – Shore D hardness – 70 - 85 units
Packaging & Availability
- Pack Size
- 1kg kit
- 7.5kg kit
Storage & Handling
- Storage
- Use suitable chemical storage for semi-solid materials.
- Shelf Life - 12 months temperate; 6 months tropical