Dosing apparatus (101; 201) for dosing incoherent products in form of granules, micro granules, flakes, powder or similar, said products being, in particular, components of a polymeric mixture, said dosing apparatus (101; 201) comprising: - one or more dosing stations each comprising at least one feeding hopper for containing one of said products and at least one shutter element for dosing the product, said feeding hopper comprising at least one dosage opening, said shutter element being configured to adjust said dosage opening with a variable passage section according to a desired quantity of product to be dosed; - at least one batch hopper configured to receive said products from said one or more dosing stations and provided with a weighing unit to detect a weight of a quantity of product introduced into said batch hopper at each dosage of a quantity of product from a dosing station; - a control unit configured to control said shutter element of each dosing station so as to carry out the following operations: * operating said shutter element in a determined open position for a determined opening time to bring down a quantity of said product by gravity from said feeding hopper to said batch hopper; * receiving a signal from said weighing unit, said signal being indicative of a weight value of said quantity; * comparing said measured weight value with a reference weight value, in particular a desired weight dosage; characterized in that said control unit is configured to control said shutter element of each dosing station so as to carry out the following operation: * determining a set point value of the opening position of said shutter element on the basis of the outcome of said comparison and/or determining a set point value of the opening time of said shutter element on the basis of the outcome of said comparison. - one or more dosing stations each comprising at least one feeding hopper for containing one of said products and at least one shutter element for dosing the product, said feeding hopper comprising at least one dosage opening, said shutter element being configured to adjust said dosage opening with a variable passage section according to a desired quantity of product to be dosed; - at least one batch hopper configured to receive said products from said one or more dosing stations and provided with a weighing unit to detect a weight of a quantity of product introduced into said batch hopper at each dosage of a quantity of product from a dosing station; - a control unit configured to control said shutter element of each dosing station so as to carry out the following operations: * operating said shutter element in a determined open position for a determined opening time to bring down a quantity of said product by gravity from said feeding hopper to said batch hopper; * receiving a signal from said weighing unit, said signal being indicative of a weight value of said quantity; * comparing said measured weight value with a reference weight value, in particular a desired weight dosage; characterized in that said control unit is configured to control said shutter element of each dosing station so as to carry out the following operation: * determining a set point value of the opening position of said shutter element on the basis of the outcome of said comparison and/or determining a set point value of the opening time of said shutter element on the basis of the outcome of said comparison. * operating said shutter element in a determined open position for a determined opening time to bring down a quantity of said product by gravity from said feeding hopper to said batch hopper; * receiving a signal from said weighing unit, said signal being indicative of a weight value of said quantity; * comparing said measured weight value with a reference weight value, in particular a desired weight dosage; * determining a set point value of the opening position of said shutter element on the basis of the outcome of said comparison and/or determining a set point value of the opening time of said shutter element on the basis of the outcome of said comparison.