ASA (Acrylic-styrene-acrylonitrile) is a similar plastic to ABS in mechanical properties but has the added resistance to outdoor weathering (UV resistance) which ABS does poorly in.  This should be the principle considering when choosing ASA as you printing material.

Since Ultimaker uses an open filament system, it is not mandatory to always use OEM filament.  As such, Shop3D wants to carry a nice selection of filaments at different price ranges to suit all users.  Of course the durability of your printer is paramount so this is why it has taken us so long to test a whole array of suppliers to find one that will produce a quality filament for an economical price.

This is an economy filament we've tested with our Ultimaker's and found it is of good quality and consistency.  It should work natively with your Ultimaker 2+ with the stock ABS settings.  Some tuning adjustments and fine tuning your settings may be required for ASA.  The spool fits your Ultimaker spool holder without modification.  They are 1kg spools so you have more material per spool vs. OEM 750gr spools.

Our testing has shown that it is not as suitable for use on the Ultimaker 3 Series of Printers.  Bed adhesion is more difficult, the spool size of the Ultimaker 3 is smaller so the fit is tight and finally Generic ASA requires HIPS to pair for soluble support.  We recommend using this material with Ultimaker 2+ Printers.

* Note on use of ASA in 3D Printing:  ASA should not be used in a classroom environment without an enclosure and filtration.  ASA printing should be conducted in a well ventilated workshop for best safety practices. *