Preparing for Upcoming SCAQMD Rule 1143 Solvent Restrictions
Posted on June 20, 2026
For many years, PCBTF and t-BAc have been valuable formulation tools due to their performance characteristics and favorable regulatory status. As SCAQMD moves toward restricting these materials, manufacturers of coatings, adhesives, cleaners, paint thinners, and specialty chemical products may need to identify alternative solvent systems that maintain performance while meeting future regulatory requirements.
To help prepare for these changes, A.G. Layne is actively evaluating solvent alternatives and monitoring Maximum Incremental Reactivity (MIR) values across our product portfolio. Our team is reviewing a wide range of ketones, esters, alcohols, exempt solvents, and specialty blends that may assist customers in transitioning away from PCBTF and t-BAc while preserving product quality and performance.</0>
We understand that reformulation involves more than simply replacing one solvent with another. Solvent changes can affect solvency strength, drying characteristics, resin compatibility, VOC compliance, and overall product performance. Our goal is to work alongside customers throughout Southern California to identify practical and cost-effective reformulation solutions.
As SCAQMD continues its rulemaking process, A.G. Layne will remain engaged with industry developments and provide support to customers navigating these changes. We are committed to helping manufacturers prepare for the future and develop compliant formulations that continue to perform in the marketplace.
Helpful Resources
• SCAQMD Proposed Rule 1143 Updates
• SCAQMD Presentations Regarding PCBTF and t-BAc
• MIR VOC List
If your organization is evaluating alternatives to PCBTF, t-BAc, or other regulated solvents, we welcome the opportunity to discuss potential replacement options and reformulation strategies.