Pure melt-blown ultra-fine filter material of OAM series is produced from high dissolving fat PP used as the special material though the latest melt-blown technique and next treatment. It has used properties of ultra-fine fiber, high filtering performance, and little resistance. This material could be applied to various air filter materials such as filter with low, middle or high performance, air self-clean equipment, and vacuum cleaner. High tolerance of dust content and acid/alkali resistant is its main advantage. Width could be 1.6 or cut according to requirement, while length could be customized. It could be applied to folded or bag air filter and could be ultrasonic fused or sewed.