If you want to reduce the production cost, I suggest you add some calcium powder instead of rice straw powder or sawdust, because rice straw powder or sawdust is a relatively light thing that floats on the surface of raw materials and is not easy to precipitate to the bottom of the tank for production. And rice straw powder or sawdust has little effect on weight. Only some manufacturers who make high-grade pillows will add some tea leaves or spice powder to the raw materials, but they want to increase the fragrance and fresh smell rather than increase the weight. But calcium powder is different. With good equipment, the proportion of calcium powder can reach 10%-50%, which is of great benefit to reducing costs. However, too much calcium powder will increase the brittleness of the product, so whether some fillers can be added to reduce the cost depends on what kind of products and product requirements are produced.
In addition, the hardness you mentioned, our normal way to improve hardness is to adjust the formula of raw materials, such as increasing the proportion of hardener, which are more effective and stable practices.
Kemasi polyurethane machinery equipment