Newsline

NEW STUDY CONFIRMS COMMONLY USED GRANITE IS SAFE FOR COUNTERTOPS . . .

July 1, 2008
/ Print / Reprints /
ShareMore
/ Text Size+

A new study of the most popular granites used for kitchen countertops in the U.S. concludes that granite is safe to use in kitchens.

The study, designed to determine whether radon gas sometimes released by natural stone poses any health risk, was released by the Marble Institute of America (MIA) and conducted by an independent geochemistry researcher. Included in this study were 13 of the most popular types of granites used in countertop applications, representing up to 85% of the granite countertops sold in the U.S.

“This is the first time anyone has taken a comprehensive, scientific look at the array of granite actually being used in kitchens across the U.S.,” said L. L. Chyi, a Ph.D. and professor of Geology and Civil Engineering at The University of Akron in Ohio. “Based on the testing results and EPA standards, we can conclude that the most popular granites used as countertop surfaces pose no health threat to homeowners.”

The issue of granite containing radon has surfaced repeatedly over the years, often fueled by manufacturers of radon detection devices and producers of synthetic stone countertops. Each time, the MIA and several natural stone producing companies have responded by engaging independent researchers to determine if any potential health hazard exists. Studies have consistently verified that granite countertops are safe.

The 13 granites used in the study were selected because they are among the most popular countertop surfaces in the U.S. They include:

• New Venetian Gold, which is imported from Brazil. It is a medium-grained, yellow-beige gneiss with many dark red garnets.

• Ubatuba, also imported from Brazil. It is a medium- to coarse-grained, olive-green granite.

• Santa Cecilia, from Brazil. It is a coarse-grained, yellow-grey gneiss with up to pie-sized, red garnets.

• Tropic Brown, from Saudi Arabia. It is a medium-grained, brown granite.

• Absolute Black, from India. It is a black basalt.

• Tan Brown, from India. It is a black-brown igneous rock with big, shapeless, brown-red feldspar crystals.

• Giallo Ornamental, from Brazil. It is a coarse-grained, brown-yellow granulite with some brown-red garnets.

• Crema Bordeaux, from Brazil. It is also known as Juparana Crema Bordeaux (Brunello), an exceptionally coarse exotic material that is commercially sold as granite, even though it is not geologically a granite.

• Baltic Brown, from Finland. It is a brown-black granite.

• Giallo Veneziano, from Brazil. It is a medium- to coarse-grained, ochre-yellow to golden-brown, also light pink, gneiss.

• Dakota Mahogany, from the U.S. It is a medium- to coarse-grained, brown-red granite.

• China Black, from China. It is a fine-grained basalt.

• Yellow Star, from China. It is a medium-grained yellow to pink granite.

The results found that Crema Bordeaux, which emitted the greatest amount of radon, contributes less than 7% of the EPA’s standard for action. The stone emitted 0.27 pCi/L, or less than 7% of the EPA’s level of 4.0 pCi/L, well below any cause for health concerns. Tropic Brown and Baltic Brown, second and third in radon emanation based on Dr. Chyi’s testing, amounted to only 1% of the standard for action. The other granites added almost immeasurable amounts of radon to the house.

Tests were designed to measure the amount of radon each granite type added to the interior of a 2,000-square-foot home with 8-foot ceilings. However, the study did not reflect the ventilation normally found in a typical home, through windows, vents, heating and air conditioning. A typical heating, ventilation, air-conditioning system can exchange a home’s air up to six times per hour. This natural ventilation would dissipate radon gas levels significantly.

“Because the study does not reflect the natural ventilation typically found in homes, real-world radon concentrations are likely to be even lower than those measured in this study,” said Dr. Chyi.

The test results are available on the MIA’s Web site, www.marble-institute.com.

Did you enjoy this article? Click here to subscribe to Stone World 

You must login or register in order to post a comment.

Multimedia

Videos

Image Galleries

October 2014 Stone World Stone Products Online Gallery

Check out the latest products from stone companies.

Stone World Magazine

Stone World October 2014 cover

2014 October

Featured on the cover of this issue is the Colorado Yule quarry in Marble, CO, which was recently purchased by Italian stone producer, R.E.D. Graniti.

Table Of Contents Subscribe

Contemporary Stone & Tile Design Magazine

CSTD Fall 2014 cover

2014 Fall

In this issue of Contemporary Stone & Tile Design, we take a look at the latest developments in TPT, with a feature article and you can read more comments from Waldrep on this subject as well as other industry professionals.

Table Of Contents Subscribe

STONE STANDARD

Are you aware of the new stone standard – ANSI/NSC 373 Sustainability Assessment for Natural Dimension Stone?
View Results Poll Archive

The Stone World Store

How_To_Polish_&_Restore_Mar.gif
How to Polish & Restore Marble Flooring

This video will show you step-by-step how to resurface and polish marble flooring from grinding and removing lippage and scratches to achieving a highly reflective polish.

More Products

Stone Industry Education

Stone Industry Education

From fabrication...to installation...to marketing and much more!  We provide natural stone professionals with stone knowledge and education they can count on, as well as great networking opportunities. Click here to go to Stone Industry Education.

STAY CONNECTED

facebook logo Twitter  YouTubeGoogle+

Vertical Sector Focus: Critical Infrastructures

criticalhomepagethumbFrom terrorism to vandalism, it’s preparedness, response, training and partnerships. Learn about some of the critical security issues facing this sector.

Visit the Critical Infrastructure page to read more.