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particular is frequently used as a material for bearings, since its porosity allows lubricants to flow through it or remain captured within it. in the case of materials with high melting points such as teflon and tungsten, sintering is used when there is no alternative manufacturing technique. in these cases
very low porosity is desirable and can often be achieved. metallurgists can sinter most, if not all, metals. this applies especially to pure metals produced in vacuum which suffer no surface contamination. many nonmetallic substances also sinter, such as glass, alumina, zirconia, silica, magnesia, lime...
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