Description

Aptflex F21 is a two-part, high performance encapsulation material, exhibiting toughness, excellent hydrolytic stability and an acoustic wave speed similar to that of seawater.

These properties make Aptflex F21 an ideal system for hydrophone potting, marine encapsulation applications or as an acoustic window.

Aptflex F21 is particularly useful where small delicate components are potted since the material exhibits low shrinkage and hence stress during the cure phase.

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 seawater
Very low transmission loss

Technical Specifications

Appearance	Black
Density Part A	0.91g/ml
Density Part B	1.22g/ml
Mix Ratio	3.35:1 (By Weight A:B)
Cured Density	1.050g/ml
Initial Mixed Viscosity	50 poise at 25°C
Usable Life	25 minutes at 25°C
Gel Time	50 minutes at 25°C
Curing times*:	24-48 hours at 25°C over night 30°C 5 hours at 50°C 3 hours at 80°C
Hardness	80-85 Shore A
Tensile Strength	12MPa
Elongation at Break	300%