C & C Safety Glass does not warrant glass for the spontaneous breakage of glass due to Nickel Sulphide Inclusions or for any other reasons.
C & C Safety takes no responsibility for any costs, damages or personal injuries which includes incidental or consequential damages, labour costs directly or indirectly which are as a result of spontaneous breakage due the presence of Nickel Sulphide Inclusions.
Thermally toughened glass carry’s the risk of spontaneous breakage due to the possibility of Nickel Sulphide presence. It is not possible to eliminate Nickel Sulphide in glass raw glass composition. It is therefore recommended to reduce this risk by heat soaking the glass Please note: Heat Soak Treatment cannot fully eliminate the risk of spontaneous breakage, it only minimizes the risk.
Risk of Nickel Sulphide Inclusion – EXPLANATION
Nickel Sulphide Inclusions (NiS) are inherent in glass production and are resultant from the presence of nickel contaminants in the glass melt reacting with sulphur. During thermal toughening these inclusions undergo a crystalline phase change to a smaller form and are fixed in place within the glass upon cooling. Over time the inclusions grow and eventually impart enough stress in the glass to cause spontaneous failure. There is a risk of spontaneous breakage due to the possible presence of nickel sulphide particles in glass. Despite efforts from glass manufacturers all over the world to eliminate or reduce the incidence of nickel sulphide inclusions in glass, there is no glass manufacturer that guarantees the complete absence of Nickel Sulphide Inclusions in their glass and they do not guarantee their products against spontaneous breakage due to NiS.