The addition of 0.05% calcium chloride had a similar effect to the addition of 0.1% SHMP; the samples did not gel in 500 days at 25 °C, whereas the control milk gelled in 75 days (Kocak and Zadow 1985). The increased stability of samples containing added calcium is opposite to the finding of Samuelson and Holm (1966). Ellerton and Pearce(1964) also reported accelerated age gelation in UHT concentrated milk with added calcium.