The raw dataset of tensile engineering stress strain was obtained by stretching (50 mm/ min) ASTM Die C dumb-bell specimens (till failure) in a Hounsfield UTM (H10KS) at ambient and elevated (120 Degree Celsius/ hot) temperatures. The specimens from 2 defective test inflatable seals (Seals), 3 per Seal Quadrant (per measuring temperature), were stretched after environmental conditioning and without stress softening. The fluorohydrocarbon rubber (FKM) Seals, belonging to the 500 MW(e) sodium cooled Prototype Fast Breeder Reactor design and produced by cold feed extrusion (and continuous cure), were rejected (manufacture: 2007) due to several quality issues. Tensile tests in the UTM after standard-Seal-storage, as part of broader experimental design (2017- 2019), were aimed at a quality consistency in consonance with the Gen IV Sodium-cooled Fast Reactor technology. For that purpose, specimen- preparation (from the Seals) had to ensure that signature of improper production on the Seal compound (APA-1, 2007) is identifiable by the tests. APA-1 2007, made of advanced polymer architecture (APA), is a blend compound (50 : 50) of peroxide cured Viton GBL 200S : 600S. The raw dataset, containing the signature (residual stress, substantially lower hot tensile strength) of improper production, corresponds to stress-strain curves in a related research article viz., N. K. Sinha, S. Chattopadhyay, 2022. A case study on elimination of premature failure sources from manufacture of fluoroelastomer inflatable seals for sodium cooled fast reactor towards sustainability. Eng Fail Anal. 134, 106039. https://doi.org/10.1016/j.engfailanal.2022.106039.The related research article showed that the signature (Seal defect) is traceable to defect source i.e., improper cure index of APA-1, 2007. The source propagated from macromolecular to macroscopic domain (i.e. defect) through the routes of premature inception of cure (in APA-1, 2007) and undercure (of APA-1, 2007) during the improper production.The 46 sets of tensile engineering stress-strain (23 per Seal) containing the processing signature are structured across 3 Levels using 7 folders i.e., L-1: RAW_ESS_SEALS, L-2: R_ESS_SEAL-1, L-2: R_ESS_SEAL-2, L-3: R_ESS_SEAL-1-RT, R_ESS_SEAL-1-120, L-3: R_ESS_SEAL-2-RT and R_ESS_SEAL-2-120. Each of the 4 L-3 folders contains 2 PDF files or Tables. Each Table contains data from two Quadrants (6 specimens ideally). The raw dataset was obtained by rounding UTM raw data to a precision of two digits after decimal.The raw dataset carries significant reuse potential (sizing-optimisation-design) for development of APA-FKM/ rubber components by finite element analysis (FEA). Other reuse potential includes modelling-simulation-validation (of defect, manufacture) by residual stress and significantly lower hot tensile strength in the raw dataset using molecular dynamics-Monte Carlo method-FEA. Identification/ development of constitutive relation is common (related research article).

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