Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Polymer Name
- Composite Materials Functions
- Technologies
- Product Families
Features & Benefits
- Materials Features
- Features and Benefits
- Fast application, build-up with few passes
- Tough and resilient
- Maintains dimensional tolerance over time
- Low shrinkage, low exotherm
- Easy to cut and machine with carbide tools
- Machines with chips - low dust generation
- Low tool wear
- Remarkable profile of finished parts
- No settling in the equipment
- Easy to repair - bonds to itself
- Compatible with polyester sanding primers
- Constant hardness over time, after 24 hours, or after 6 months
Applications & Uses
- Markets
- Application Method
- Compatible Polymers & Resins
- Composites Processing Methods
- Applications
When applying Crestamould® T29 Sprayable the first layer is critical. The first layer needs to be applied with a thickness between a minimum of 1.5mm (1/16”) and a maximum of 3mm (1/8”). The first layer should be uniformly applied and allowed to gel, exotherm and cool down. Duration approx. 1 - 1.5 hours. Once this first coat cools to room temperature, subsequent coats of up to 3mm (1/8”) can be applied, waiting for a relative cool-down between the passes to approx. 43-49°C (110-120°F). This is repeated until the total desired thickness is achieved. The secondary bonding window is such that no sanding is required between coats if the job is stopped. The coverage is 1 litre/1mm/m2 (0.6 gallons per inch per ft2). Tool marks are removed with 80-120 grit sandpaper. The surface needs no further preparation prior to sanding and primer application.
- Equipment
- Crestamold® T29 Sprayable can be dispensed through a suitable internal mix catalyst pumping/ spraying system, such as a gelcoat dispensing machine, or for more industrial applications a ram-type dispensing machine can be used.
- The recommended tip size for spraying is 0.53mm using a 521 tip, pressurized between 55-70 psi via a pumped unit or 70 psi for air assisted spraying.
- Machining
Use carbide tools. End-mill tools are used for the majority of the work, ball-end tools for finishing. Adjust speeds to avoid overheating or overloading and material pull out. Do not leave the CNC unattended. Brush or blow off material as it accumulates on flat surfaces. If possible, blow air at tool-tip. A shop temperature of 24°C (75°F) and above will improve machining and reduce tool wear. Colder temperature will make the Crestamould® T29 Sprayable harder. Remove shavings daily from part and do not leave machine unattended when in use.
Properties
- Color
- Mechanical Properties
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Hardness (after 24 hours) | 70 | Shore D | — |
| Glass Transition Temperature (Tg) | 90 | °C | — |
| Value | Units | Test Method / Conditions | |
| Viscosity (at 25°C, RV1 PP35Ti at 6) | 3000 - 7000 | mPa.s | — |
| Viscosity (at 25°C, RV1 PP35Ti at 0.6) | 15,000 - 45,000 | mPa.s | — |
| Density | 0.78 - 0.83 | g/cc | — |
| Gel Time (at 25°C, 100g at 2% M50) | 20 - 30 | Minutes | — |
| Peak Exotherm (100g mass) | max. 150 | °C | — |
Storage & Handling
- Shelf Life
- 9 Months
- Storage and Shelf Life
- Shelf life - IIf stored correctly, Crestamould® T29 Sprayable has a shelf life of 9 months.
- Storage - The product should be kept in securely enclosed containers. Storage should be in a dry place and out of direct sunlight. The temperature should be between 18-25°C (65-77°F). Allow material to reach shop temperature before using. Keep containers closed to eliminate styrene evaporation and to avoid change in properties.