Chlorinated Rubber vs Acrylic Traffic Paint: Why Chlorinated Was Phased Out

Chlorinated rubber traffic paint dominated U.S. striping work from the 1960s through the early 2000s. By 2026 it's functionally retired — replaced by waterborne acrylic on nearly all new work. The reason is regulatory, not performance. Below we cover why acrylic won, what chlorinated rubber actually is, and where the legacy chemistry still surfaces.

What is the quick answer?

Chlorinated rubber traffic paint runs 350 to 500 grams of VOC per liter, which exceeds the U.S. Environmental Protection Agency's Architectural Coatings cap (40 CFR Part 59 Subpart D) and most state-level limits. Waterborne acrylic traffic paint runs under 100 g/L VOC and meets every U.S. air-quality rule. Acrylic also matches or beats chlorinated rubber on lifespan, color retention, and bond. The combination is why nearly every state DOT moved its Qualified Products List off chlorinated rubber between 2005 and 2015. For the broader chemistry comparison, see traffic paint chemistry comparison.

What is chlorinated rubber traffic paint?

Chlorinated rubber traffic paint carries pigment in a chlorinated polyolefin resin dissolved in aromatic solvents (typically xylene or toluene). The chlorinated rubber resin is the same chemistry used in some marine and pool coatings; the U.S. Coast Guard's coating specifications discuss its corrosion-resistance properties. For pavement marking, the formula was prized for fast solvent flash-off in cold weather, decent UV stability, and good bond to both asphalt and concrete.

The trade-off was always solvent load. The aromatic solvents that gave chlorinated rubber its cold-weather application window are exactly the compounds the EPA targeted under the Clean Air Act when it set the Architectural Coatings rule.

What is acrylic traffic paint?

Acrylic traffic paint -- specifically waterborne 100-percent acrylic emulsion -- carries pigment in water with an acrylic latex binder. The binder cures by water evaporation followed by particle coalescence into a continuous film. VOC content sits well under 100 g/L, often as low as 50 to 80 g/L for premium SKUs. Sherwin-Williams Setfast, PPG ParkingLot Plus, and Ennis-Flint HydroPlus are common modern SKUs.

Cure speed is slightly slower than chlorinated rubber in cold weather but faster in warm weather. Lifespan, color retention, and bond all match or exceed chlorinated rubber.

How do the two systems compare?

Why did chlorinated rubber get phased out?

Three regulatory waves pushed chlorinated rubber out:

• EPA Architectural Coatings rule, 1998. Codified at 40 CFR Part 59 Subpart D, this rule capped most architectural coating VOC at 100 g/L. Traffic marking paint received a category-specific carve-out, but chlorinated rubber's 350-to-500 g/L profile sat at the high end of that carve-out and signaled regulatory risk.
• Ozone Transport Commission states, 2002 onward. Northeast and Mid-Atlantic states adopted tighter VOC rules that pulled chlorinated rubber off many state DOT QPLs.
• California SCAQMD Rule 1113. South Coast Air Quality Management District tightened VOC limits below the EPA cap. Chlorinated rubber lost market share in California first, then nationally as paint manufacturers consolidated formulations around the lowest-common-denominator rule.

By 2010, most major paint manufacturers had reformulated their fleet around waterborne acrylic and discontinued chlorinated rubber SKUs. Specialty distributors continued to stock for legacy military and industrial applications, but commercial parking-lot work shifted entirely.

The existing Cojo article on eco friendly striping paint covers the broader environmental positioning of the regulatory shift; this product page focuses narrowly on the chlorinated-rubber-versus-acrylic chemistry decision.

Where does chlorinated rubber still surface?

Three places:

• Legacy DOT spec drawings. Older state DOT spec drawings still reference chlorinated rubber. If a project bids off a 1998 spec sheet, verify with the current QPL before sourcing material.
• Specialty industrial coatings. Some chlorinated rubber-based paints survive in marine, pool, and corrosion-resistant industrial applications. The U.S. Coast Guard publishes specifications for some of these.
• Stockpile tail end. A handful of distributors still hold chlorinated rubber traffic paint inventory. Use only after verifying state air-quality rule compliance, and never on a federally-funded project.

For a longer treatment of chlorinated rubber's current legal status, see chlorinated rubber traffic paint still allowed.

Are there other reasons acrylic won?

Yes -- application, cleanup, and worker exposure.

• Cleanup. Waterborne acrylic cleans up with water from rigs, hands, and adjacent surfaces. Chlorinated rubber requires xylene or MEK solvent cleanup, which generates RCRA hazardous waste under EPA solid-waste rules.
• Worker exposure. Aromatic solvents in chlorinated rubber raise OSHA and NIOSH exposure concerns. The Occupational Safety and Health Administration's permissible exposure limits for xylene (29 CFR 1910.1000) require respiratory protection in confined work zones, which most outdoor striping crews avoid.
• Equipment compatibility. Modern waterborne-rated airless rigs (Graco LineLazer 3400/5900) are optimized for waterborne paint. Running chlorinated rubber requires solvent-rated seals and a separate cleanup protocol.

Cojo install reference -- handling a legacy spec

In March 2026 a property manager off 9th Avenue in Albany contacted us with a 2003 maintenance contract that called for "chlorinated rubber traffic paint, federal yellow." The original spec was written when the lot was first paved and never updated. We:

• Pulled the current Oregon DOT Qualified Products List for traffic paint.
• Verified that no current QPL entry uses chlorinated rubber.
• Recommended waterborne acrylic in federal yellow with a 6 lb bead drop.
• Updated the maintenance contract language to reference "waterborne acrylic traffic paint, AASHTO M247 Type I bead, MUTCD federal yellow."

The lot striped in waterborne acrylic, 11 gallons across 92 stalls, and the contract spec is now current. For Albany-area context, see our traffic paint supply Albany Oregon page.

Get a chemistry-current striping quote.