A specialised chemical called PTBC, made only in Vapi town of Gujarat, will be sent to Visakhapatnam on an urgent basis to help in neutralising the effects of gas leak at a polymer plant, a Gujarat government official said on Thursday.A major leak from a chemical plant of LG Polymers near Visakhapatnam in Andhra Pradesh in the wee hours of Thursday impacted villages within a five-km radius, leaving eight people dead and scores of citizens complaining of breathlessness, nausea and other problems.