METHYL METHACRYLATE  (MMA) , TWO COMPONENT TRAFFIC PAINT

 

GENERAL

Methyl Methacrylate (MMA) Two component traffic paints may be used as traffic paints in high traffic areas such as intersections (crosswalks, symbols), roundabouts, traffic circles, bike lanes, & bus lanes.  

 

Note: MMA two component traffic paints give off large amounts of heat upon reaction. For some MMA formulations mixing of small volumes (less than 5 gallons) is recommended due to the exothermic reaction. Certain MMA coatings require specialized application equipment therefore never apply with standard painting equipment. Surfaces for application shall be clean, dry & free of loose material. MMA should be applied to unpainted substrates or to previous MMA coatings. MMA may not adhere properly to previously painted surfaces that utilized waterborne or thermoplastic markings therefore care should be taken to ensure complete removal of these previous paint markings are achieved. New Concrete pavements should be allowed to cure for a minimum of 30 days prior to painting. New HMA pavements should be allowed to cure per manufacturers recommendation prior to painting. MMA should not be applied to surfaces below 40 degrees F or above 100 degrees F or as recommended by the manufacturer. Friction anti-slip additives may be used with this product when enhanced traction is desired.

 

ACCEPTANCE

Acceptance of MMA, two component traffic paint for use on the Department of Transportation projects will be on the basis of manufacturer and brand name approval. Approved manufacturers and brands of MMA two component traffic paints are listed in the Materials Approved Products Listing Enterprise (MAPLE).

 

 

APPROVAL OF METHYL METHACRYLATE (MMA) Two Component Traffic Paints

MMA, two component traffic paints are an option for painting high traffic areas. The accepted MMA, two component traffic paints shall conform to the following requirements:

 

Properties

Test Method

Value

Daytime and Nighttime Color, White & Yellow

ASTM D 6628

Within color box

LRV Value (Y-Reflectance) White 2° D 65

ASTM D 6628

Greater than 80

LRV Value (Y-Reflectance) Yellow 2° D 65

ASTM D 6628

45 to 60

Yellow Index (YI) White

ASTM E313

Less than 10

Total Solids % by weight

 

99.0 Minimum

Properties after mixing with Catalyst

 

 

Mixing Ratio

 

Per manufacturer

Cure Time @ 77°F (Minutes)

 

Max 30

Chemical Resistance (Time of immersion and sample thickness shall be as recommended by the manufacturer for the product submitted, the ability to recover from immersion is critical)

ASTM D 2792

Minimal or No effect after immersion in Hydrocarbon Solvents or Fuels.

Skid Resistance

ASTM E 303

45 BPN Minimum

Initial Retro-Reflectance Day Dry Skip*

ASTM D 6628

350 Minimum

1 Year Retro-Reflectance Day Dry Skip*

ASTM D 6628

200 Minimum

Initial / 1 year Retro-Reflectance Wet*

If data available

75 Minimum

Hardness Shore Durameter, Type D

 

50 Minimum

Adhesion to concrete

ASTM D 7234

150 psi

      ‘* Average of concrete and asphalt

 

Initial approval of MMA two component traffic paints will be based on manufacturer providing information / test data to prove the product meets the above requirements. The manufacturer shall also include the following information: AASHTO Product Evaluation and Audit Solutions Test Data (field and lab) if available, Product Data Sheet, MSDS sheets, Technical Brochures and recommendations for product usage. Products should be submitted to the AASHTO Product Evaluation and Audit Solutions program to remain approved.

 

The sand used to maintain friction shall be a commercial quality dry 8/20 blast sand or other recommended by the MMA manufacturer.

 

Glass Beads / reflective elements usage and application shall be as recommended by the manufacturer. Minimum retro-reflectance requirements are listed above.

 

Alternate conditional approval of MMA Traffic paints may be allowed subject to the following. The MMA product manufacturer must provide successful product usage examples in Iowa. Technical Data sheets for the product must be provided confirming compliance to the above specifications. Conditional approval of a product may be granted on a case-by-case basis at the discretion of the department.

 

CERTIFICATION

Products on the approved list in MAPLE will remain unless formulations change or if failure to submit the product to the AASHTO Program for product evaluation does not occur. Manufacturers are responsible for notification to the department if any of their products change formulations.

 

MONITOR SAMPLING & TESTING

The Construction and Materials Bureau may require manufacturer quality control testing to verify compliance with specifications. In the case of compromised or suspected non-complying material the department may direct that the product be sampled and submitted to an independent lab for evaluation. If the submission fails to meet manufacturers published physical properties it may be rejected – in addition removal from MAPLE may occur.

 

Do not use paint that is beyond its expiration date without written consent from the paint manufacturer. Submit written consent to the engineer prior to incorporation.