Table 3.
Classification of wood resistance to subterranean termite based on antifeedant value (Sornnuwats et al. 1995)

Class	Antifeedant value (%)	Resistance rate
IV	75 ≤ x < 100	very strong
III	50 ≤ x < 75	strong
II	25 ≤ x < 50	moderately strong
I	0 ≤ x < 25	Weak