S₁₆SrTi₁₂

Architectural potential

A strontium-titanium polysulfide cast at 130 °C on a hotplate, delivering 150 MPa of compression and an eighty-nine-per-cent cut in embodied CO₂ against Portland cement. That combination puts it squarely in the detail and tile register, where the firing is replaced by chemistry and the supply chain shortens to a studio bench. Natural placements are drop-cast floor tile in exhibition fit-outs, thick inlay panels in acoustic walls, cast thresholds and sill plates for retrofit carpentry, and yellow-orange accent courses in pavilion skins where the sulfur palette is wanted as part of the architecture. At 500 g per batch and a two-kilogram workshop ceiling, the material sits at detail scale rather than slab scale — a run of tiles, a cast stair nosing, a sequence of skirting pieces rather than a continuous floor. The cement comparison makes the environmental argument legible without forcing reinforced-scale claims the chemistry cannot yet support. The caveat is workshop logistics: cutting and grinding the cured body releases sulfide odour, the batch ceiling limits any one piece to the size of a large floor tile, and precursor availability (TiO₂, strontium carbonate) keeps the supply-chain score at 0.29, well below the alkali-silicate baseline.

Material character

The slab reads a deep yellow-orange, warmed by the titanium fraction into a honey register rather than the brass yellow of pure polysulfide siblings. At 3.70 g/cm³ in an 85×85×37 mm format the piece lifts with a firm two-handed grip — denser than a fired clay tile of the same footprint, slightly lighter than the copper-heavy sulfides of the atlas. Surface mold-matte with a faint meniscus sheen along the upper face; edges as-cast, sharp and slightly reflective. A fine α→β sulfur bloom settles across the face under raking light. Against the Cu-Mn-Na sulfide baseline, the body is noticeably less saturated and cooler in tone.