Description
PERMABOND 268 is a medium-high viscosity cyanoacrylate for large gap fill applications.
Permabond 268 provides faster set times and improved gap-filling capability compared to conventional cyanoacrylates. The adhesive bonds to a wide range of substrates including metals, ceramics, plastics and elastomers. It is excellent for bonding difficult-to-bond plastics such as polyacetals. It can also be used on passivated metal surfaces.
Features and Benefits
- Versatile and general purpose
- Good gap fill ability
- Instant setting
Approved to MIL-A-46050C Type II Class 3 (existing designs)
Physical Properties of Uncured Adhesive
| Chemical Composition | Ethyl Cyanoacrylate |
| Appearance | Colorless/Clear |
| Viscosity @ 25°C | 1,200-2,400 mPa.s (cP) |
| Specific Gravity | 1.1 |
Typical Curing Properties
| Maximum gap fill | 0.43 mm (0.017 in) |
| Fixture/Handling time *
(0.3 N/mm^2 shear strength is achieved) |
5-10 seconds (Steel)
5-10 seconds (Buna N Rubber) 5-10 seconds (Phenolic) |
| Full strength | 24 hours |
*Handling times can be affected by temperature, humidity and specific surfaces being bonded. Larger gaps or acidic surfaces will also reduce cure speed but this can be overcome by the use of Permabond C Surface Activator (CSA) or Permabond QFS 16.
Typical Performance of Cured Adhesive
| Shear strength*
(ISO4587) |
Steel: 20-22 N/mm² (2900-3200 psi) |
| Impact strength
(ASTM D-950) |
3-5 kJ/m² (1.4-2.4 ft-lb/in²) |
| Coefficient of thermal expansion | 90 x 10^-6 mm/mm/°C |
| Coefficient of thermal conductivity | 0.1 W/(m.K) |
| Hardness
(ISO868) |
85 Shore D |
*Strength results will vary depending on the level of surface preparation and gap.
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