Three melt-processable fluoropolymers for plastics.toml. PVDF (Solvay Solef PVDF homopolymer TB v2.1, Solef 6010 column): rho=1.78 g/cm^3, E=2.1 GPa, Tm=173 degC, Tg=-40 degC, T_max=150 degC, k=0.20 W/(m*K), Cp=1200 J/(kg*K), alpha=1.4e-4 /K, rho_v>=1e14 ohm*cm, V_break=22 kV/mm. Homopolymer values only — Solef Flex / Kynar Flex copolymers (Solef 11010/21510/31508/60512) report ~2-3x lower modulus and are NOT used. Piezoelectric d33 (~-30 pC/N for beta-phase) omitted: schema lacks piezo coefficient field today; tagged with TODO comment in TOML. PFA (Chemours Teflon PFA Properties Handbook, Teflon 340 column): rho=2.15, E=0.27 GPa, sigma_t=25 MPa, Tm=306 degC, T_max=260 degC, k=0.19, Cp=1172, alpha=1.4e-4 /K, rho_v>1e18, eps_r=2.1, V_break=80 kV/mm, n=1.350, transmission=93 %. FEP (Chemours Teflon FEP Properties Handbook, Teflon FEP 100 column): rho=2.14, E=0.55 GPa, sigma_t=23 MPa, Tm=260 degC, T_max=204 degC, k=0.20, Cp=1004, alpha=1.35e-4 /K, rho_v=1e17, eps_r=2.05, V_break=79 kV/mm (10-mil thin film), n=1.344. Closes #140, #141. Citations: Solvay/Syensqo Solef PVDF Typical Properties (v2.1, R 01/2014), DuPont/Chemours Teflon PFA Properties Handbook (Teflon 340/350), DuPont/Chemours Teflon FEP Properties Handbook (Teflon FEP 100/140/160). All vendor TBs cited as kind="vendor", license="proprietary-reference-only". Per-material `_sources._default` plus per-property entries for every populated value, mirroring the #138/#139 (CFRP/G-10) provenance pattern. Spot-check: >>> from pymat import pvdf, pfa, fep >>> pvdf.density, pfa.density, fep.density (1.78, 2.15, 2.14) >>> pvdf.source_of('mechanical.density').citation 'solvay_solef_pvdf_2014'

Add PFA / FEP fluoropolymers #141

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