urn:nasa:pds:context:instrument:em3.ptf_100_friability_tester 1.3 1.25.0.0 Product_Context 2026-07-07 1.3 Removed duplicate Internal_Reference entries from Reference_List. 2025-12-24 1.2 Adding missing "facility" references. 2025-12-24 1.1 Updated schema version. Adding missing "facility" references. 2025-10-23 1.0 Initial export from OLAF urn:nasa:pds:context:facility:laboratory.em3 instrument_to_facility Bhatt, S., Davis, T.P., Cotto-Figueroa, E. Asphaug, Garvie, L.A.J., Hoover, C.G. 2024. Nano-Chemo-Mechanical Behavior of the Carbonaceous Chondrite Meteorite Tarda: Implications for Planetary Defense. In review. PTF 100 Friability Tester Mechanical Properties Instrument The PTF-100 Friability Tester is a precision mechanical tumbler designed to quantify the abrasion and fragmentation resistance of particulate or granular materials under controlled impact conditions. The instrument consists of a transparent rotating drum with an internal baffle that lifts and drops the sample continuously during rotation, generating reproducible normal and shear stresses that simulate natural collisional disaggregation. For each test, a known mass of sample fragments is tumbled at a fixed rotation speed (25 ± 1 rpm) for prescribed revolution counts ranging from 10^2 to 10^5. The cumulative mass loss and particle-size redistribution are measured after each tumbling stage to compute friability. The system conforms to the U.S. Pharmacopeia (USP <1216>) standard for friability measurement but has been adapted for geological materials by using stainless-steel drums and extended revolution counts to capture both early-stage cracking and late-stage attrition processes relevant to meteorite fragmentation.