De or het loodvrij?

The correct Dutch article is:

de loodvrij

Rule Words ending in -ij and -erij: usually de. See the rule

How to use loodvrij

the loodvrijde loodvrij
this loodvrijdeze loodvrij
that loodvrijdie loodvrij
our loodvrijonze loodvrij
your loodvrijjouw loodvrij
every loodvrijelke loodvrij
which loodvrij?welke loodvrij?
a big loodvrij / the big loodvrijeen grote loodvrij, de grote loodvrij

Dutch words ending in loodvrij

euroloodvrij

In compound words, the last part decides the article. See the rule