Obere sintering na-ahapụ PTFE adịghị agbaze, na-eme ka micro-pores, adhesion na-adịghị mma, ebe siri ike, ike ọrụ dị ala, na ọdịdị milky. Ikpo oke ọkụ na-eweda PTFE, na-emepụta pinholes, afụ, nhịkọ, agba odo na-acha oji, na uzuoku na-egbu egbu. Ha abụọ na-emebi kọmpat, ịrụ ọrụ anaghị arụ ọrụ, mgbanwe, mkpuchi, na nkwụsi ike akụkụ. Oke kacha mma 370-400C na-amịpụta ọkara transperent, dị nro, mkpuchi tan. Nlele anya: matte ọcha = under-sintered; odo/nkụri akụ = over-sintered. (296 nkeji)