Spray head intended for a spray can, and spray can provided with such a spray head

A spray head for a spray can having a pressure container, a control valve and an outflow channel for dispensing a material which expands after dispensing, said spray head comprising a flow channel having an inlet and an outlet, the inlet being communicable with the outflow channel of the spray can;

• a control part operable to control the valve of the spray can;
• a biassed valve located in the spray head outlet;
• and a material expansion absorption arrangement in communication with the flow channel for interacting with the control part to absorb expanding residual material wherein a predetermined, threshold pressure of the biassed valve is higher than a predetermined threshold pressure needed to put the material expansion absorption arrangement into operation, whereby after dispensing of a quantity of material, the material expansion absorption arrangement can absorb expanding residual material from the control valve, and on a subsequent use, the material expansion absorption arrangement is returned first to an initial position before the control valve of the spray can is opened.