To test the efficiency of the eraser between Luffa cotton and coir fiberAs the course in the past to use the blackboard and chalk for equipment used in teaching, but the use of the chalk dust from the chalk powder, causing And may pose a danger to health. Due to the current who invented new board. Or that we"re familiar with the so-called white board The whiteboard is developed to provide a comfortable and easy to use. But it is still faced with the problem as well as the blackboard.The group of so I choose fiber loofah. Kapok fiber and fiber and coconut. For use in experimental studies. Because it is readily available from local raw materials No adverse effects on the environment. The properties of Luffa fiber cotton and coconut fiber. Found that Luffa qualified water absorb. Kapok fiber and coconut fiber feature that helps to absorb water. Why I choose the 3 group of fiber type of study from you this time.
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