The expansion, scheduled to be operational within the next 18 months and located at Singur in the Hooghly district, will be funded through internal accruals. This additional capacity of 70,000 tonnes per annum will increase the company's speciality carbon black capacity to 1.3 lakh tonnes per annum, enhancing the cumulative capacity to 2.5 lakh tonnes from the current 1.8 lakh tonnes, the official added.