As Howard pointed out, its not urea free, but nevertheless, it is a good foliar feed. All the components of the fertilizer are water soluble and meant to be absorbed by the leaves. If given in the right proportion urea (less than 75-100 ppm) is good for orchids as a foliar feed (Its bad for orchid roots as in orchid media urea is converted to ammonia by bacteria very quickly causing the pH to rise and burning the roots.)
There was a long article in the AOS magazine sometime last year, I also remember the title, it was Growing the Best Phalaenopsis, and it recommended Urea in their fertilizer regimen.
As the product mentions, give it a try on some Phals for a week or two before spraying your whole collection. I would recommend you adding 0.5 g of fertilizer to 1 litre of water, this will give you 100 ppm each of NPK also the amount of N from urea will be 62.5 ppm which is acceptable. Just remember that it should be sprayed on the leaves of the plants (Once every week or so). Also at such low conc. Urea will not be bad for the roots.