Statement of Problem: Marginal impression tearing causes defect that reduce the accuracy of the impression and consequently affect the accuracy of final restoration. Aim of study: The aim of this study was to evaluate the effect of time elapsed after setting on the tear strength of different elastomeric impression materials.Materials and methods: Three types of elastomeric impression materials (Polyether, Poly-vinyl siloxane and Vinylsiloxanether). The specimens were divided into three groups with (n= 15) according to type of impression material. Each group were further subdivided into three subgroups (n= 5) according to time elapsed after setting. The specimens were loaded in tension until failure with a crosshead speed of 500 mm/minute.Results: Regression analysis using two-way Analysis of Variance (ANOVA) was used for studying the effect of impression material, time after setting and their interactions on mean tear strength. The significance level was set at P ≤ 0.05. Statistical analysis was performed with PASW Statistics 18.0® (Predictive Analytics SoftWare) for Windows.Immediately after setting, Addition Silicone showed the statistically significantly highest mean tear strength. This was followed by Vinylsiloxanether. Polyether impression showed the statistically significantly lowest mean tear strength value. Each material showed enhances in tear strength by time elapsed after setting.Conclusion: Time elapsed after setting is directly proportion to improving the tear strength of the impression material used. poly-vinyl siloxane impression materials are recommended in clinical situations which contain fine details.