Quality of CA glue

when you're storing CA glue, just shake it every once in a day, just to keep it awake so i say. i keep it on the bench in basement, tho my basements like always 10-20 degrees fahrenheit colder than the house, so its kinda like a mild fridge. NEway, no purity doesn't really have much of an effect. just look at drying time, strength, and thickness i say. really depends on what you plan to use it for...

I just get vca medium gap filling, since it's cheap, available, and works well/

I normally don't select stuff acording to what is written on the apckage or advertising.

There are such a range of CA glues out there that I don't think there is a standard for all of them.

sounds to me like a hokey marketing thing rather than a technical spec. CA glue can have varying concentrations of active ingredient, but usually its purity isnt a serious issue. you should be more concerned with how its been stored, since CA does have a shelf life. the best place to store CA is in the fridge. cant remember why. just make sure that you dont glue tomorow night's dinner together