AMSTERDAM, May 5 (Reuters) - Dutch speciality chemicals company DSM on Wednesday lifted its outlook for 2021, as a strong recovery of demand for its industrial materials helped its first-quarter results beat expectations.

DSM said core earnings in the January-March period increased 13% to 441 million euros ($530 million), as sales rose 7% to 2.19 billion euros.

Analysts polled by the company on average had predicted adjusted earnings before interest, taxes, depreciation and amortisation (EBITDA) to increase to 423 million euros, with a 5% increase of sales.

($1 = 0.8319 euros) (Reporting by Bart Meijer; Editing by Tom Hogue)