South Africa’s mainly white Solidarity union will begin a strike on Monday at petrochemicals firm Sasol SOLJ.J over a share ownership scheme offered exclusively for black staff.

“We intend to switch off a different section of Sasol each day by means of well-laid and strategic plans,” the union said in a statement.

Under black economic empowerment rules, South African companies are required to meet quotas on black ownership, employment and procurement as part of a drive to reverse decades of exclusion under apartheid.