Biresin® S8 is a Two component epoxy system, Component A epoxy resin, filled, black. Component B amine, unfilled, amber.

Chemical Family: Epoxy & Epoxy Derivatives

Functions: Surface Finish

Processing Methods: Vacuum Bagging

Color: Black

Technical Data Sheet

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Knowde Enhanced TDS

Identification & Functionality

Composite Materials Functions

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
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
ValueUnitsTest Method / Conditions
Compressive Strength120MPaISO 604
Density1.22g/cm³ISO 1183
Flexural Modulus3500MPaISO 178
Flexural Strength90MPaISO 178
Impact Resistance9kJ/m²ISO 179
Hardness86Shore DISO 868
Component A
ValueUnitsTest Method / Conditions
Viscosity at 23°CpastymPa.s
Density at 23°C1.21g/cm³
Component B
ValueUnitsTest Method / Conditions
Density at 23°C1g/cm³
Viscosity at 23°C~ 130mPa.s
Thermal Properties
ValueUnitsTest Method / Conditions
Heat deflection temperature130°CISO 75B
Glass transition temperature134°CISO 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.