Sintering hniam chuan PTFE chu a hmin lo a, micro-pores, adhesion tha lo, rough surface, mechanical strength hniam, leh milky appearance a siam thin. A lum lutuk hian PTFE a tichhe a, pinhole, bubble, brittleness, yellow-to-black color, leh toxic fumes a siam chhuak thin. An pahnih hian compactness, non-stick performance, flexibility, insulation, leh dimensional stability te an tichhe vek a ni. Optimal range 370–400°C ah chuan semi-transparent, smooth, tan coating a pe chhuak thin. Mit hmuh theiha enfiah: matte white = under-sintered; yellow/brittle = a tam lutuk. (296 chars) a ni.