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Testing Protocol and Requirements

Testing Protocol and Requirements

Gas Chromatography Analyzer in Laboratory

GLP Testing Protocol and Product Requirements

Green Label Plus Indoor Air Quality Testing Program

Green Label Plus is an independent testing program that identifies carpet, adhesives, and cushion with very low emissions of VOCs to help improve indoor air quality. It is an outgrowth of, and enhancement to the CRI Green Label Testing program. By selecting Green Label Plus carpet, adhesive, or cushion, you are assured one of the lowest emitting products on the market, and you may be able to earn credit under LEED, Green Globes, or Green Guide for Health Care.

To receive initial certification, carpet products undergo a 14-day testing process, as required by California’s Section 01350 Standard Practice for VOC Testing that measures emissions for a range of possible chemicals. An independent laboratory tests products for emission levels:

California Section 01350 Compounds - Applies to All Program Categories

  • ​Acetaldehyde
  • Benzene
  • Carbon Disulfide
  • Carbon Tetrachloride
  • Chlorobenzene
  • Chloroform
  • Dichlorobenzene (1,4-)
  • Dichloroethylene (1,1)
  • Dimethylformamide (N,N-)
  • Dioxane (1,4-)
  • Epichlorohydrin
  • Ethylbenzene
  • Ethylene Glycol
  • Ethylene Glycol Monoethyl Ether
  • Ethylene Glycol Monoethyl Ether Acetate
  • Ethylene Glycol Monomethyl Ether
  • Ethylene Glycol Monomethyl Ether Acetate
  • Formaldehyde
  • Hexane (n-)
  • Isophorone
  • Isopropanol
  • Methyl Chloroform
  • Methylene Chloride
  • Methyl T-butyl Ether
  • Naphthalene
  • Phenol
  • Propylene Glycol Monomethyl Ether
  • Styrene
  • Tetrachloroethylene
  • Toluene
  • Trichloroethylene
  • Vinyl Acetate
  • Xylenes, technical mixture (m-, o-, p-xylene combined)

GLP Program Specific Compounds

Carpet Category
  • 1-Methyl-2-Pyrrolidinone
  • 2-Ethylhexanoic Acid
  • 4-Phenylcyclohexene (4PCH)
  • Caprolactam
  • Nonanal
  • Octanal
Cushion Category
  • 4-Phenylcyclohexene (4PCH)
  • BHT
Adhesive Category
  • 1-Methyl-2 Pyrrolidinone
  • 2-Ethyl-1-Hexanol
  • 4-Phenylcyclohexene (4PCH)
  • Benzothiazole
  • Isooctylacrylate
  • Methyl Biphenyl
  • Vinyl Cyclohexene

* Note: All criteria presented above are for CRI GLP 14-day and 24-hour tests except Caprolactam criteria is set at an EF of 131 μg/m2·h and a Concentration of 70 μg/m3 for the 24-hour test.

In order to earn and maintain Green Label Plus certifications, carpet, adhesives, and cushion products must undergo a three-tier testing process to monitor continued compliance with the test program requirements.

GLP Emissions Criteria

GLP test results are confidential and not to be shared with any outside parties without the expressed written consent of The Carpet and Rug Institute.

Types of Tests

Initial testing is required for entry to the program. Samples will be evaluated against the full listing of California Section 01350 compounds for emissions no higher than one-half the listed Chronic Reference Exposure Level (CREL) for each compound (except Formaldehyde, which is reported at the full CREL). Refer to the GLP Emissions Criteria for a list of additional testing criteria specific to the Green Label Plus program. Additionally, the TVOC level will be reported on the GLP Certificate. Testing will be evaluated after 10 days of conditioning and 24, 48, and 96 hours (14 days) after initiating the chamber test.