The original manufacturer of Sonotech couplants continues to make significant advances in couplant technology. RFS is replacing their previous couplant range with the superior performing ECHO ULTRASONICS products which are also environmentally friendly. ECHO ULTRASONICS Forever Wedge won’t dry, run, leach, or dissolve with water or couplants. It will stay in place for months or years until you decide to remove the wedge. Forever Wedge Couplant is not an adhesive and will not bond to the wedge.

Reliable long term coupling of wedges to transducers is a critical technology to insure reproducible results and to eliminate recoupling probes to wedges during inspection. Forever Wedge Couplant is a high viscosity fluid for phased array and angle beam wedge attachment and for coupling delay lines. Forever Wedge Couplant lasts for the life of the probe or wedge without hardening or evaporating and yet is easily removed. Forever Wedge Couplant is impervious to water, heat, light and is non-toxic. Solve your wedge coupling issues once for the life of the wedge.


  • Non-drying – lasts for years
  • Very high viscosity – stays in place
  • Easily removed – does not harden
  • Impervious to water
  • Won’t dissolve or leach
  • Non-toxic