Aptflex F7
A two-part, highly-flexible, high performance encapsulation material, exhibiting excellent hydrolytic stability and an acoustic wave speed similar to that of fresh water.
Overview
Aptflex F7 is a highly flexible, high performance encapsulation material, exhibiting excellent hydrolytic stability and an acoustic wave speed and acoustic impedance similar to that of fresh water. It also has the lowest insertion loss and absorption of all encapsulants from Precision Acoustic Ltd
These properties make Aptflex F7 an ideal system for hydrophone windows, marine encapsulation applications or as strain reliefs around cable glands and cable repairs.
It is particularly useful where small, delicate components are being potted since the material exhibits low shrinkage and hence stress during the cure phase. The high flexibility means that F7 is not as tough and durable as other encapsulants.
Key Features
- Flexibility and resistance to temperature extremes of -50 °C to 100 °C
- Low moisture sensitivity during the cure phase
- Excellent hydrolytic stability
- Excellent electrical insulation properties
- Acoustic wave speed similar to that of freshwater
- Very low insertion loss
Technical specifications
| Appearance |
Natural (straw colour) or Black |
| Density Part A | 0.91 g/ml |
| Density Part B | 1.22 g/ml |
| Mix ratio | 6:1 (by weight A:B) |
| Cured density | 0.965 g/ml |
| Initial mixed viscosity | 70 poise at 25 °C |
| Usable life | 25 minutes at 25 °C |
| Gel time | 60 minutes at 25 °C |
| Curing times*: | 48 hours at 30 °C 16 hours at 50 °C 10 hours at 80 °C |
| Hardness | 50 to 55 Shore A |
| Tensile strength | 3.0 MPa |
| Elongation at break | 300% |
*Curing Times are temperature dependant. Precision Acoustics reserves the right to change the specification without notice
The shelf-life of unopened containers is at least 12 months.