Sorel Cement

Sorel cement is a hard, fast-setting cement made by combining magnesium oxide powder with a magnesium chloride solution. It produces a dense, fire-resistant material historically used in industrial flooring, insulation, and molded products. In many 20th-century formulations, asbestos fibers were added as reinforcement.

Origin

The cement was invented in 1867 by the French chemist Stanislas Sorel, who also developed several other early industrial cements and coatings. It became commercially important in the late 19th and 20th centuries as a binder for flooring composites, stove linings, grinding wheels, and pipe and boiler insulation.

Significance in Asbestos Context

Many Sorel-cement products manufactured between roughly the 1900s and the 1970s contained chrysotile or amphibole asbestos as a reinforcing fiber, particularly in industrial flooring (sometimes called "magnesite flooring" or "magnesium oxychloride flooring"), high-temperature insulation, and molded refractory shapes. Workers who installed, sanded, patched, demolished, or removed magnesite floors (common in factories, breweries, dairies, hospitals, and ships) could inhale substantial asbestos dust, and the material is still encountered today during renovation of older buildings. Identifying Sorel-cement products in an exposure history matters because it ties a patient's disease to a specific category of product, which in turn can point to identifiable manufacturers and historical brand names that may be relevant to a claim.

Example Sentence

The industrial hygienist reviewing his work history noted that the old magnesite flooring he had repeatedly patched and sanded at the brewery was a Sorel cement product known to contain chrysotile asbestos.

Related Terms

Chrysotile, Magnesite Flooring, Asbestos-Containing Material (ACM), Refractory, Product Identification, Occupational Exposure

Notes

• If you or a family member worked with or around "magnesite" or "composition" flooring, stove or furnace linings, or molded insulation, list those product types explicitly in your exposure history. Investigators may be able to match them to specific Sorel-cement product brands.
• Preserve any old job records, union records, building specifications, or product invoices that mention magnesite flooring, oxychloride cement, or named brands; these documents help identify the manufacturer.
• Sorel-cement flooring is still present in many older industrial buildings; if renovation or demolition exposure is part of your history, document the building, dates, and tasks performed.
• Ask your legal team whether a bulk sample of suspected material can be analyzed by polarized light microscopy (PLM) to confirm both the Sorel-cement matrix and the asbestos fiber type.