KFB-0.3mm

空间用抗辐照玻璃盖片, 用于太空飞行器上硅太阳能电池表面的防护材料. Antiradiation coverglass for silicon solar cells on spacecraft. This is a second, thicker (0.3mm) KFB variant documented separately from the 0.12mm variant (code KFB-0.12mm) with its own spectral spec, density, and irradiation-test flux/ΔT values. Source intro (p.113) also names a 'BF' grade for this section, but no BF technical-index table, curve, or property table was located in either source PDF. Density given as a range (3.06~3.10); midpoint used for physicalProperties.density. Curve re-digitized from clean-scan PDF chart (booklet p.119), which sits immediately before this grade's 0.3mm technical-index table (p.120) and whose spec anchors (320nm/400nm/450nm/500-1100nm) match this chart closely — however note the in-graph curve label on p.119 itself reads 'BF', not 'KFB', an unresolved ambiguity in the manufacturer's original scan (possibly a mislabel, or the BF and KFB-0.3mm curves are near-identical and this single trace was reused for both). Confirmed left edge is genuinely ~0% out to the UV cutoff near 310-320nm (matches spec ≤1.0% at 320nm), not a digitization default. Plateau (500-2500nm) reads visually flat at ~90% with only a very gentle IR-tail decline toward 2500nm.