Enhanced TDS
Knowde-enriched technical product data sheet
Identification & Functionality
- Chemical Family
- Composite Materials Functions
- Technologies
- Product Families
Features & Benefits
- Product Highlights
- Polishable to high gloss (degree of gloss up to 85)
- Good grindability and spreading properties
- Heat resistance up to 130 °C
- Dense surface and good edge stability
- Good styrene resistance
Applications & Uses
- Markets
- Applications
- Composites Processing Methods
- Application
- Manufacturing of master models, gages and vacuum forming tools
- Manufacturing of negative molds in composites industry
- Processing
- The material, processing and mold temperature should be at least 18 ─ 25 °C.
- Component A must be stirred thoroughly before use.
- Recommended release agents are Sika® Liquid Wax-815 or Sika® Pasty Wax-818. For more information, see Product Data Sheets of the release agents.
- Pay attention to dry conditions and dry mold surfaces while processing.
- Porous surfaces have to be well sealed before.
- Both components have to be mixed thoroughly according to mixing ratio with a spatula or slow speed mixing equipment.
- Apply the gelcoat in a homogenous thickness on the mold by using a flat, short-haired brush. We recommend to apply the material in a uniform direction in order to get a homogeneous, even and void-free surface coat.
- Within the geltime of gelcoat we recommend to apply a coupling layer or other backfilling layer in order to avoid adhesion problems.
- In order to improve resistance of gelcoat and final part against temperature influences, solvents as well as exposition of water, a post curing process of 4 h / 120 °C of the final part is recommended. In this case a slow increase and slow decrease of temperature is required.
- Further post curing of the demoulded part can improve the final mechanical properties.
- Depending on the geometry and weight of the part, it is recommended to use a conformer while post curing.
- For cleaning the final part from release agent residues, we recommend Sika® Reinigungsmittel-5. Before use of other cleaners, compatibility must be tested.
Properties
- Color
- Mechanical Properties
Value Units Test Method / Conditions Compressive Strength 120 MPa ISO 604 Density 1.22 g/cm³ ISO 1183 Flexural Modulus 3500 MPa ISO 178 Flexural Strength 90 MPa ISO 178 Impact Resistance 9 kJ/m² ISO 179 Hardness 86 Shore D ISO 868 - Component A
Value Units Test Method / Conditions Viscosity at 23°C pasty mPa.s - Density at 23°C 1.21 g/cm³ - - Component B
Value Units Test Method / Conditions Density at 23°C 1 g/cm³ - Viscosity at 23°C ~ 130 mPa.s - - Thermal Properties
Value Units Test Method / Conditions Heat deflection temperature 130 °C ISO 75B Glass transition temperature 134 °C ISO 11357
Packaging & Availability
- Packaging Type
- Packaging
- Resin (A), Biresin® S8 : 0.4 kg / 8 kg
- Hardener (B), Biresin® S8 : 0.08 kg / 1.6 kg
- Kit (AB), Biresin® S8 : Box: 6 x 0.4 kg (A) + 6 x 0.08 kg (B)
Storage & Handling
- Storage Conditions
Shelf life
- Resin (A), Biresin® S8 : 12 months
- Hardener (B), Biresin® S8 : 12 months
Storage temperature- Resin (A), Biresin® S8 : 18 ─ 25 °C
- Hardener (B), Biresin® S8 : 18 ─ 25 °C
Crystallization- After prolonged storage at low temperature, crystallization of components may occur.
- This is easily removed by warming up for a sufficient time to a maximum of 60 ─ 80 °C.
- Allow to cool to room temperature before use.
Opened packagings
- Containers must be closed tightly immediately after use to prevent moisture ingress.
- The residual material needs to be used up as soon as possible.