This is the reply I got from donaghys
Armour-Prus is a class 2 type braid however is unique in its design in the sense that it has a very high break load in the sheath so can share the load.
Depending on the application it is possible to use a class 1 type splice where the jacket and core are sharing the load.
We do know of some Arborists who choose to do a modified class 1 type splice which has a shorten tail and tapered sheath which goes back through the braid at the neck of the splice which can also be whipped.
The major advantage you get with Armour-Prus is the extremely high wear resistance and extended life of the braid you get from the jacket.
It would not be our recommendation to expose the core as Spectra has a low melt point.
Under the circumstance where you maybe quickly descending or any instance where the core would be subject to high friction and temp, you then run the risk of melting the Spectra core when exposed and inturn shortening the life of the rope and its integrity.
The advantage you get from having Spectra in the core is its light weight and high strength.
Having said this, it is best to use a splice that best suits the application which should be determined by the end user.
As the manufacturer we can only provide suggestions on what splice best suits the product as a whole i.e Class 2 In the instance where a prussic knot is tied you are always going to getting much better strength out of a splice, no matter which splice you choose to use.
