Chemical/Physical Properties
Palatal® K 775 V-02 is a bisphenol A epoxy vinyl ester resin dissolved in styrene. This resin has moderate reactivity and moderate viscosity.
Palatal® K 775 V-02 is pre-promoted with an amine.
Main Applications
Palatal® K 775 V-02 is primarily used for chemical anchoring. It is also suitable for fiber-reinforced coatings and automotive body fillers/putty.
This resin exhibits excellent mechanical properties and high chemical resistance, particularly against alkaline media. Laminates made from Palatal® K 775 V-02 demonstrate outstanding long-term heat resistance.
Approvals
Cured, unreinforced Palatal® K 775 V-02 complies with Type 1310 of DIN 16946/2 and is classified as Group 5 according to DIN 18820/1.
Product Specifications at Delivery
| Properties | Range | Unit | TM |
|---|---|---|---|
| Appearance | Transparent | - | 2265 |
| Color, Lico 200 | 0–7 | G | 2017 |
| Refractive Index | 1.5580–1.5630 | - | 2150 |
| Viscosity, 23°C | 390–490 | mPa·s | 2013 |
| Solid content, IR | 59–62 | % | 2033 |
| Cure time at 25 to 35°C | 4.5–8.5 | min | 2625 |
| Curing time from 25°C to peak temperature | 7–12 | min | 2625 |
| Peak temperature | 125–150 | °C | 2625 |
Viscosity measurement: S 2/100 s⁻¹ at 23°C
. Reactivity was determined by adding 2 g of Perkadox CH 50 (AKZO-Nobel) to 100 g of resin.
Properties of the liquid resin (typical values)
| Property | Value | Unit | TM |
|---|---|---|---|
| Flash Point | Approx. 33 | °C | 2800 |
| Stability, without initiator, in the dark, at 25°C | 6 | Mon | - |
Properties of unfilled resin castings (typical values)
| Property | Value | Unit | TM |
|---|---|---|---|
| Tensile Strength | 95 | MPa | ISO 527-2 |
| Tensile Modulus | 3.6 | GPa | ISO 527-2 |
| Elongation at break | 6.1 | % | ISO 527-2 |
| Flexural strength | 150 | MPa | ISO 178 |
| Flexural modulus | 3.4 | GPa | ISO 178 |
| Flexural elongation | 6.5 | % | ISO 178 |
| Impact Strength—Notched Specimen | 28 | kJ/m² | ISO 179 |
| Heat Deflection Temperature (HDT) | 105 | °C | ISO 75-A |
| Glass Transition Temperature (Tg) | 130 | °C | DIN 53445 |
Mechanical properties depend on the resin rather than the amine accelerator. Cure
with 2 mL of Butanox LPT (AKZO-Nobel)
and add 1 mL of cobalt octoate solution (a 1% cobalt solution in styrene) to
100 g of resin. Cure at room temperature for 24 hours, then at
120°C for 24 hours
Processing
Palatal® K 775 V-02 typically exhibits tack-free curing. However, the surface may not be fully cured.
To ensure that surfaces exposed to air are non-tacky, a suitable additive (e.g., a paraffin solution) should be added.
The final cure state can be optimized by post-curing for several hours at a high temperature (e.g., 80 or 100°C).
Palatal® K 775 V-02 is pre-activated with an amine and can be cured using common benzoyl peroxide (BP)-based curing agents. It is important to note that fillers, color pigments, and other additives affect not only the resin’s shelf life but also its curing properties.
Pre-Use Guidelines
The resin should be conditioned at a specific temperature determined by the application (MEKP/Co curing typically requires a minimum temperature of 15 °C). Curing with BP peroxides allows for curing at lower temperatures.