SikaPower®-492 G
SikaPower®-492 G is a one-part, epoxy-based, warm-applied, heat-curing, impact modified, structural adhesive. It is designed for sheet metal assembly work in the body shop and is cured with heat, e.g in the paint oven.
- Semi crash resistance
- Adheres well to oily substrates
- High wash-out resistance
- Can be spot-welded
- High strength
- Suitable to join different metals
- Distortion-free joining
- Solvents, PVC and isocyanate free
- Contains fine glass beads for layer thickness control
PRODUCT BENEFITS
- Semi crash resistance
- Adheres well to oily substrates
- High wash-out resistance
- Can be spot-welded
- High strength
- Suitable to join different metals
- Distortion-free joining
- Solvents, PVC and isocyanate free
- Contains fine glass beads for layer thickness control
Areas of Application
SikaPower®-492 G is suitable for structural bonding of different types of metal and specific plastic materials. It is designed for use in combination with spot-welding, riveting, clinching and other mechanical fastening techniques, and in some cases as a partial replacement for them. The bonding of oily substrates (standard anti-corrosion treatment and deep drawing oils, approx. 2 g/m2) is possible because of the oil uptake during the heat curing. The glass beads contained in the adhesive provide an even layer thickness and prevent excessive squeezing out of the adhesive when joining. This product is suitable for experienced professional users only. Tests with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.Product Details
| Chemical base | Epoxy hybrid | |
| Color (CQP001-1) | Black | |
| Solid content (CQP576-1) | 99 % | |
| Density (uncured) | 1.3 kg/l | |
| Application temperature | 50 — 60 °C | |
| Viscosity η* (DIN 54458) | flowability A4 at 45 °C | 230 Pa.s |
| Levelling behavior G' (DIN 54458) | A2 at 45 °C | 40 000 Pa |
| Curing conditions | standard 180 °C minimum 160 °C | 30 minutes A 15 minutes A |
| Tensile lap-shear strength (CQP046-9, CQP580-6 / ISO 4587) | at 10 mm/minute | 28 MPa B/C |
| Dynamic resistance to cleavage (CQP505-1, CQP580-6) | at 2 m/s | 27 N/mm B/D |
| T-peel strength (CQP580-2, -6 / ISO 11339) | at 100 mm/minute | 13 N/mm B/D |
| Tensile strength (CQP580-5, -6 / ISO 527) | at 2 mm/minute | 30 MPa |
| Elongation at break (CQP580-5, -6 / ISO 527) | at 2 mm/minute | 8 % |
| Young's - modulus (CQP580-5, -6 / ISO 527) | at 2 mm/minute | 1 600 MPa |
| Glass transition temperature (CQP039-1 / ISO 6721) | peak | 110 °C F |
| Shelf life | 9 months E |
| CQP = Corporate Quality Procedure | A) substrate temperature | B) steel, HDG, H420, 1.2 mm |
| C) bondline thickness 0.2 mm | D) bondline thickness 0.3 mm | E) stored at temperature below 25 °C |
F) tensile vibration, frequency 1 Hz, deformation stat./dyn. 0.3/0.05 %, heating rate 1 K/min
CURE MECHANISM
SikaPower®-492 G is cured by heat. The cure-rate depends on temperature and time of exposure. The most common heat sources are convection ovens. The maximum temperature must not exceed 210 °C for more than 10 minutes.
Application
METHOD OF APPLICATION
SikaPower®-492 G is typically applied in bead form with a diameter of 1 to 3 mm.
All parts of the application system in contact with the product must be heated. A phased temperature increase from 35 °C at the follower plate to 55 °C at the application nozzle is typically used. During longer breaks (e.g. over night or weekends) suitable standby temperatures and switch-off times must be taken into account.
The time between application and curing must be as short as possible, since moisture uptake could cause formation of blisters during the heat curing process. However, moisture uptake can be prevented by pre-curing the assemblies or car bodies for 15 minutes at 160 °C (substrate temperature).
SikaPower®-492 G can be processed with manual-, pneumatic- or electric driven piston guns as well as dispensing equipment.
For advice on selecting and setting up a suitable pump system and related process parameters, contact the System Engineering Department of Sika Industry.