mpa the results are grouped in table 2 it is noticed that with add1 it is possible to significantly reduce the friction coefficient of the muds than with add 5 aerobic biodegradability tests were only conducted on add 1 to 3 and on the hydrocarbon oil edc 95 11 following the oecd 306 protocol for 7 days and 28 days the biodegradability results are gathered in table 3 it is noticed that the results are excellent for add1 and add2 the measured biodegradability percentages are considerably larger than certain regulatory requirements of 20 which is not the case of add 3 after 7 days the flash point nf en iso 2719 the pour point astm d 7346 and kinematic viscosity 40 u00b0 c nf en iso 3104 of lubricant compositions containing 500 ppm 1 or 3 of additive addi are measured and compared with those of the corresponding non additived hydrocarbon oil the results are grouped in table 4 repeatabilities of the measurements for the flash point the repeatability r is 8 10 u00b0 c r 0 071 u00d7 the value found during the measurement for the pour point the repeatability is 6 u00b0 c regardless of the measured value for the viscosity r 0 082 u00d7 value of the measurement 1 it is seen that by incorporating an additive it is possible to slightly increase the value of the flash point of the oil the pour point is.