en Research Paper Research Paper This article examines the Weibull statistical analysis that was used for investigating the effect of melt filtration on tensile properties and defects formed inside the casting. Forming and entrapping of double oxide films have been explained by using the context of critical velocity of melt in the runner. SutCast software results were used to examine the amounts of the velocity of melt as such. SEM/EDX analysis is used to observe the presence of double oxide films in the fracture surfaces of the tensile specimens. The article goes on to propose that castings made with foam filters with smaller pores show higher mechanical properties and reliability due to higher Weibull modulus and fewer defects Double oxide film defect, Ceramic foam filter, Weibull module, Aluminum A356 alloy, Critical velocity 14 24 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-127-48&slc_lang=en&sid=1 A. Khakzadshahandashti a.khackzad@gmail.com 180031947532846002514 180031947532846002514 Yes N.Varahram 180031947532846002515 180031947532846002515 No P. Davami 180031947532846002516 180031947532846002516 No