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Document Designation and Title Year Select Item(s) C1421 Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature 09 C1421 Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature 01b C1421 Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperatures 01a C1421 Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature 01b(2007) C1421 Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperatures 99