(1)The felts per volume weight g/cm3can be neither too big it will lose springnor too small it will lose wearabilityBoth its thickness and the furs thickness have effect on different properties. The user can select accoriding to your own requirementbut youd better be told the usage of the products in to avoid the production and the usage.
(2)At present there are two kinds of feltspecial grade felt and general felt.They are divided according to the thickness of raw material,size of per volume weight and the difference of colour. Technologydemands are divided according to whether it has strength stretchstretch and capillary action.The user can select it according to his own requiremet. It can be a checking standard when check up.