China, ranked number seven, had performed way above expectations to reach the final, putting out top seeds Republic of Korea on a tiebreak and fighting back from 4-1 down to beat Portugal in the semi-finals.
Thailand, however, were in a different class. Having beaten Canada 22-0 and bronze medallists Great Britain 18-1, they wasted no time in taking control of the final match with some superbly accurate throwing.
The fourth end effectively put Thailand out of China's reach. Already 3-1 to the good, Pattaya Tadtong sent down a blue ball that seemed almost to glue itself to the jack.
Try as they might, China could not separate the balls and, when their supply was exhausted, Witsanu Huadpradit twice went through the narrowest of openings to claim two points and extend the lead to 5-1.
A brilliant ricochet by Watcharaphon Vongsa paved the way for Thailand to claim five points in the fifth for an unassailable nine-point lead.
Defending Mixed Pairs - BC4 champions Eliseu Dos Santos and Dirceu Pinto of Brazil have worn an aura of invincibility throughout the tournament and showed no signs of letting it slip against Radek Prochazka and Leos Lacina of the Czech Republic in the gold medal match, winning 5-3.
BC4 bronze went to Canada.
In the Mixed Pairs - BC3 gold medal match, Greece - the number one ranked team and strong favourites - beat Portugal 4-1.
Greece gave another lesson in the art of precision Boccia, racking up a 4-0 lead in the first three ends.
They introduced a substitute for the final end, but Grigorios Polychronidis - individual silver medallist at Bejing 2008 - was at his metronomic best to the last, even though Portugal gained some consolation by winning the final end by a single point.
Bronze in the category went to Belgium