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D/2 Biological Solution is a biodegradable, easy to use liquid that removes stains from mold, algae, mildew, lichens and air pollutants. It is effective on marble, granite, limestone, brownstone, travertine, masonry, terra cotta, concrete, stucco, wood, and other architectural surfaces including monuments, sculpture and headstones. A contact time of only 10 to 15 minutes followed by scrubbing with a soft nylon or natural bristle brush will loosen most biological and air pollutant staining.

D/2 Biological Solution is effective for removing harmful biological and air pollutant staining from many building materials including masonry, marble, granite, limestone, brownstone, travertine, terra cotta, concrete, stucco, wood, canvas and vinyl & aluminum siding.

Features and Benefits
Fast acting: 10 to 15 minutes contact time for great results.
Contains no acids, salts, or bleach
pH 9.5
Will not etch metals or glass
Safer to use around plantings
Is not a hazardous material and requires no special handling or protection
Use full strength, no in-field mixing required
Shelf life of 5 years

Safety Information
D/2 Biological Solution is non-mutagenic, and contains no carcinogenic compounds as defined by NTP, IARC, or OSHA. It is considered essentially non-toxic by swallowing, as it has an oral LD50 of 2.0 g/kg of body weight. No special ventilation is required during use.

Packaging and Coverage
D/2 Biological Solution is available in 1 quart, 1 gallon and 5 gallon containers, and 55 gallon drums.
The area that can be treated with one gallon of D/2 will vary considerably as a function of the nature and extent of biological deposits, as well as the physical characteristics of the surface. Typical coverage to remove medium deposits will vary from 250 to 350 square feet per gallon.

Technical Data
D/2 is a quaternary ammonium solution with surfactants to enhance cleaning capabilities.

Physical Form . . . . . . . . . . . . . . . . Transparent, low viscosity liquid
Color . . . . . . . . . . . . . . . . . . . . . . . Almost colorless
pH . . . . . . . . . . . . . . . . . . . . . . . . . 9.5
Specific Gravity . . . . . . . . . . . . . . . 1.01g/cc
Solubility in Water . . . . . . . . . . . . . Complete
Vapor Pressure . . . . . . . . . . . . . . . 25 mm Hg @ 20C

Notice: The information contained herein is based on our own research and the research of others, and it is provided solely as a service to help users. It is believed to be accurate to the best of our knowledge. However, no guarantee of its accuracy can be made, and it is not intended to serve as the basis for determining this product's suitability in any particular situation. For this reason, purchasers are responsible to make their own tests and assume all risks associated with using this product.

Data Sheet

Why Choose D/2?

Won't deposit harmful residues
D/2 was developed by conservators who know the damage that can be done by cleaners containing acid or salts. Our product has been specially formulated without these harmful agents. D/2 is a nearly pH-neutral quaternary ammonium solution with surfactants that help carry surface contaminants away. No other solution is more trusted by architectural and monument conservators.

Can be used on a variety of surfaces
D/2 has been successfully used to remove staining from a variety of surfaces including natural stones such as marble, granite, limestone, sandstone, slate; masonry surfaces such as brick and cast stone; concrete; wood; aluminum and vinyl siding; and canvas.

It works!
D/2 has been successfully used to clean millions of buildings and monuments. From the White House to Arlington Cemetery, D/2 is trusted to work and keep on working when results matter.