UNSPSC 31371106: Calcium silicate blocks

UNSPSC 31371106 Calcium silicate blocks, a Commodity code, covers refractory and specialized masonry materials used in high-temperature applications, though the recent state and local opportunities solicited under this code show limited direct alignment with the code's nominal scope. The Santa Clara County Central Expressway Pavement Rehabilitation Project (ITB ITBRDAFY260694, due May 21, 2026) involves comprehensive pavement work including asphalt overlay, Portland cement concrete curb and gutter installation, and related transportation infrastructure improvements across a highway corridor—work that may incidentally involve masonry materials but centers on heavy civil construction. The Cobb County School District RFQ Q26077 (due January 29, 2026) solicits kilns for art and ceramics programs across elementary, middle, and high schools, seeking top-load and front-load kiln equipment with associated fireproofing materials and shelving—a school district procurement that, while tagged under this code, addresses educational equipment rather than calcium silicate blocks in the traditional refractory sense. State and local issuers tagging work under this code include county transportation authorities and school districts in Georgia and California.

The two recent opportunities span distinct geographic regions and issuing-body types: Santa Clara County in California (a county public works function) and Cobb County School District in Georgia (a school district). The code shows sparse recent activity; the mismatch between the code's nominal scope (calcium silicate blocks, a refractory material used in furnaces, kilns, and high-temperature industrial settings) and the actual work being solicited (transportation infrastructure rehabilitation and school kiln procurement) suggests that state and local procurement offices are applying this code inconsistently or that the code encompasses a broader range of ceramic and masonry products than the name alone indicates. Opportunities under this code warrant close review to confirm material specifications and actual product requirements before pursuit.