The company, which earns up to half of its profits from petrochemicals, reported a January-March net profit of THB6.86bn (US$212.7m), up from THB5.2bn a year earlier.
The profit was above the THB6.58bn forecast by six analysts polled by Reuters.
Siam Cement had posted a THB5.3bn profit in the 4Q09, turning round from a loss a year earlier thanks to the absence of inventory losses and better earnings from its cement and paper units.
Source: Reuters