R&D Chemist applicants have rated the interview process at Heraeus with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 59.5% positive. This is according to Glassdoor user ratings.
Here are the most commonly searched roles for interview reports -
One phone interview with HR (15 - 20 min)
One MS Teams interview with HR & R&D Head manager (~1hr)
One on-site interview (I was not selected at time of writing)