De or het hardsoldeer?

The correct Dutch article is:

de / het hardsoldeer

Both are correct: You can say both de hardsoldeer and het hardsoldeer.

Rule Words with both de and het. See the rule
Meaning (Dutch) soldeer dat sterkere verbindingen oplevert dan zachtsoldeer

How to use hardsoldeer

the hardsoldeerde / het hardsoldeer
this hardsoldeerdeze / dit hardsoldeer
that hardsoldeerdie / dat hardsoldeer
our hardsoldeeronze / ons hardsoldeer
your hardsoldeerjouw hardsoldeer
every hardsoldeerelke / elk hardsoldeer
which hardsoldeer?welke / welk hardsoldeer?
a big hardsoldeer / the big hardsoldeereen grote / een groot hardsoldeer, de grote / het grote hardsoldeer

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).