FTIR-Plastics: a Fourier Transform Infrared Spectroscopy dataset for the six most prevalent industrial plastic polymers.

Two datasets are presented: FTIR-Plastics-C4 and FTIR-Plastics-C8, comprising 6,000 spectra obtained through Fourier Transform Infrared Spectroscopy (FTIR) applied to the six most used synthetic polymers: Polyethylene Terephthalate (PET), High-Density Polyethylene (HDPE), Polyvinyl Chloride (PVC), Low-Density Polyethylene (LDPE), Polypropylene (PP), and Polystyrene (PS). The key feature of the datasets lies in the FTIR analysis, which reports the percentage transmittance as the intensity measure as a function of the wavelength of an Infrared light source, expressed as wavenumber (with units in cm^-1). FTIR analysis was performed using a Jasco FTIR PRO 4x spectrophotometer with a wavenumber resolution setting of 8 cm^-1 for FTIR-Plastics-C8 and 4 cm^-1 for FTIR-Plastics-C4, both employing a configuration of 32 scans and a range from 4000 to 400 cm^-1. The datasets are presented in CSV (comma-separated values) format, including the following information (per each column):

·       IDE: unique identifier of the sample.

·       Polymer: type of synthetic polymer (PET, HDPE, PVC, LDPE, PP, or PS).

·       Technique: Type of technique used (FTIR).

·       Sample: polymer sample number.

·       BR: scanning configuration (32).

·       RST: resolution configuration (8 or 4 cm^-1).

·       Data (x) y Data(y): 1884 pairs of columns for FTIR-Plastics-C8 and 3751 pairs of columns for FTIR-Plastics-C4, representing values on the "x" axis (wavenumber) and the "y" axis values associated with molecular vibration intensities, indicating the transmittance (%), which differentiates each polymer.

Additionally, the files generated by the Jasco spectrophotometer for each polymer are provided, which were standardized by adding a header with the following structure:

·       TITLE SAMPLE NAME: referring to the name of the analyzed polymer.

·       DATA TYPE: specifying the characterization technique.

·       MEASUREMENT INFORMATION: equipment used for data collection.

·       MODEL NAME: name of the equipment used.

·       SERIAL No: serial number assigned to the equipment used.

·       ACCESSORY: complementary device integrated into the equipment.

·       LIGHT SOURCE: standardized light source related to the DLATGS detector.

·       RESOLUTION: parameters are used to distinguish the wavenumber in the analyzed materials.

·       XUNIT/HORIZONTAL AXIS: referring to the unit’s title assigned on the x-axis.

·       YUNITS/VERTICAL AXIS: referring to the unit’s title designated on the y-axis.

·       FIRSTX: initial value set for the x-axis.

·       FIRSTY: initial value set for the y-axis.

·       LASTX: final value set for the x-axis.

·       LASTY: final value set for the y-axis.

·       NPOINTS: total data points in the file.