Methylcellulose foams with lignin, graphite, precipitated calcium carbonate, and citric acid: density, compression, water contact angle, FTIR, SEM, and optical microscopy data

Experimental data on methylcellulose foams modified with lignin, graphite, precipitated calcium carbonate, and citric acid. The data cover 20 formulations: a reference, 16 single-additive foams at 0.5–2 wt.%, and three multi-additive foams. Included are a summary of density, compressive moduli and water contact angles, stress–strain curves, FTIR spectra, SEM images, and optical micrographs. Sample codes and file naming are explained in README.txt.