by the ring and ball method according to en 1427 penetration was determined by the standard method as described in en 1426 flow was determined as described in the standard nfp 84 350 staining was determined as described in en 13301 cold bending was determined as described in standard nfp 84 350 density was determined using a pycnometer elastic recovery at 200 was determined as described in ueatc guide for the assessment of reinforced waterproofing roofing sheets made of bitumen modified with app or sbs 2001 ageing was performed using an oven according to en 1296 generally the coating formulations of the present invention can be prepared by the following recipe ii 5 50 w w petroleum coke petcoke and optionally mineral filler and coating formulations were prepared by standard blending methods at 200 u00b0 c composition of the coating formulation expressed as a by weight the testing results at fresh state and after ageing at 80 u00b0 c are presented in the below table 1 and show that substitution of limestone filler with petcoke gives rise to products having lower density 1 1 g cm 3 and comparable physical properties of the finished formulation the formulations comprising only petcoke examples 2 3 compared.