Morgan Advanced Materials plc (LON:MGAM) has re-opened all of its factories in China, but six other businesses are closed in Italy, India and South Africa.
The situation remains highly uncertain, added the industrial ceramics group, which has dropped its guidance and also suspended its ordinary and preference dividends.
Sales in the quarter to 21 March, when restrictions were in full force in China, dropped by 3.2% and by 0.2% if is excluded.
Morgan added it has cash of £68mln and £150mln of headroom under its credit facility while net debt excluding leases in £157mln.
There are no loans maturing until 2023, it added.