WASHINGTON — President Barack Obama will sign into law the first overhaul of toxic chemical rules in 40 years, hailing a rare moment of cooperation between Republicans and Democrats.

Lawmakers from both parties planned to join Obama today for the ceremony, along with Environmental Protection Agency Administrator Gina McCarthy, environmental advocates and industry groups that backed the legislation. White House press secretary Josh Earnest said the , which passed with broad bipartisan support, was an outlier in a political climate in which the two parties agree on little.

“Any time you see Democrats and Republicans come together on a piece of legislation, it does reflect a measure of compromise, which means that there may be some people who will criticize it because it’s not perfect,” Earnest said.

In addition to updating rules for tens of thousands of everyday chemicals used in household cleaners, clothing and furniture, the also sets safety standards for dangerous chemicals like formaldehyde, asbestos and styrene. The goal is to standardize on the national level what is currently a jumble of state rules governing the $800 ion-per-year industry.

Congress spent more than three years working on the , which rewrites the 1976 Toxic Substances Control Act and aims to “bring chemical regulation into the 21st century,” according to the American Chemistry Council, which backed the overhaul.

Business groups had sought a single, federal standard to eliminate the complexity of dealing with state regulations that don’t always line up with each other. Some Republicans opposed the legislation and called it an overzealous Washington takeover of a matter they said should be left to the states.