Regulatory Information

Volatile Organic Compounds (VOCs)

Volatile Organic Compounds (VOCs) are a significant concern in consumer products due to their potential impact on human health and environmental quality. Various regulatory bodies across the United States, European Union, and international markets have established safety standards and testing requirements to limit VOC emissions and ensure compliance with environmental and health regulations.

1. VOC Regulations in the United States

U.S. Environmental Protection Agency (EPA)

The EPA regulates VOC emissions under the Clean Air Act (CAA). The agency has established National Volatile Organic Compound Emission Standards for Consumer Products, which set VOC content limits for various product categories.

Key U.S. Regulations

(A) 40 CFR Part 59 – National VOC Emission Standards for Consumer Products

- Limits VOC emissions from paints, coatings, adhesives, and cleaning products.

- Requires manufacturers to comply with VOC content restrictions.

(B) California Air Resources Board (CARB) Regulations

- CARB enforces stricter VOC limits than federal standards.

- Applies to automotive products, personal care items, and household cleaners.

(C) Occupational Safety and Health Administration (OSHA) Standards

- Establishes worker exposure limits for VOCs in industrial settings.

- Requires ventilation and protective measures in workplaces.

VOC Testing Methods in the U.S.

- EPA Method 24: Determines VOC content in coatings and adhesives.

- Gas Chromatography-Mass Spectrometry (GC-MS): Identifies VOC composition.

- Total Volatile Organic Compounds (TVOC) Analysis: Measures overall VOC emissions.

2. VOC Regulations in the European Union

The European Union regulates VOC emissions through various directives, including the Paints Directive (2004/42/EC) and REACH (Registration, Evaluation, Authorization, and Restriction of Chemicals).

Key EU Regulations

(A) Directive 2004/42/EC – Paints and Varnishes VOC Limits

- Sets VOC content limits for architectural coatings and vehicle refinishing products.

- Requires manufacturers to label VOC content on packaging.

(B) REACH Regulation (EC No 1907/2006)

- Restricts the use of hazardous VOCs in consumer products.

- Requires chemical safety assessments for VOC-containing substances.

(C) EU Ecolabel Criteria for VOCs

- Encourages the use of low-VOC products .

- Applies to paints, adhesives, and cleaning agents .

VOC Testing Methods in the EU

- ISO 11890-2: Determines VOC content in coatings.

- EN 16516: Measures VOC emissions from building materials.

- Headspace Gas Chromatography (HS-GC): Identifies VOCs in consumer products.

The Hong Kong Air Pollution Control Regulation Cap.311W, US EPA Method 24, and SCAQMD Method 303 are interconnected in their approach to VOC testing, compliance, and emission control.

Printing Machine Cleansing Agent, and Fountain Solution are subjected to:

- Hong Kong Air Pollution Control (Volatile Organic Compounds) Regulation Cap.311W

- US EPA Method 24

- SCAQMD Method 303

3. Hong Kong Air Pollution Control (Volatile Organic Compounds) Regulation Cap.311W

Overview

The Hong Kong Air Pollution Control (Volatile Organic Compounds) Regulation Cap.311W was implemented to reduce VOC emissions from consumer products, paints, coatings, and printing inks. VOCs contribute to photochemical smog, which affects air quality and public health.

Key Provisions

1. VOC Content Limits

- Sets maximum allowable VOC concentrations for regulated products.

- Covers architectural paints, printing inks, adhesives, and sealants.

2. Prohibition on Manufacture and Import

- Restricts the manufacture and import of non-compliant VOC products.

- Ensures that only low-VOC formulations are available in the market.

3. Labeling and Reporting Requirements

- Manufacturers must label VOC content on packaging.

- Importers must submit VOC emission reports to the Environmental Protection Department (EPD).

4. US EPA Method 24

Overview

EPA Method 24 is a standardized test method used to determine the VOC content, water content, density, volume solids, and weight solids of surface coatings. It is widely used in the United States to ensure compliance with VOC emission standards. EPA Method 24 helps manufacturers comply with 40 CFR Part 59.

Testing Procedure

1. Sample Preparation

- Coating samples are collected and prepared for analysis.

2. Determination of Volatile Matter Content

- The sample is heated to 110°C to evaporate VOCs.

- The remaining non-volatile fraction is measured.

3. Water Content Analysis

- Water content is determined using Karl Fischer titration or gas chromatography.

4. Density Measurement

- Density is measured using ASTM D1475.

5. Volume Solids and Weight Solids Calculation

- Determines the ratio of solid components to total volume.

5. SCAQMD Method 303

Overview

The South Coast Air Quality Management District (SCAQMD) Method 303 is a VOC testing method used in California to regulate VOC emissions from architectural coatings and consumer products. It is part of California’s stringent air quality regulations, which often exceed federal standards.

Testing Procedure

1. VOC Content Determination

- Uses gas chromatography to analyze VOC composition.

- Measures total VOC emissions from coatings and adhesives.

2. Solvent-Based Product Analysis

- Evaluates VOC content in solvent-based formulations.

- Determines compliance with California Air Resources Board (CARB) regulations.

3. Emission Factor Calculation

- Assesses VOC release rates under environmental conditions.

- Helps manufacturers optimize low-VOC formulations.

Formaldehyde Emission

Formaldehyde Emission

ASTM D6007 Standard Test Method for Determining Formaldehyde Concentrations in Air from Wood Products Using a Small-Scale Chamber

California Air Resources Board (CARB) - Formaldehyde Emission

Determination of free formaldehyde with reference to 90/207/EEC

In the realm of indoor environmental quality, formaldehyde stands as a significant concern. This volatile organic compound (VOC), while essential in various manufacturing processes, poses a serious threat to human health. From respiratory irritation and allergic reactions to the more severe risk of cancer, formaldehyde exposure can have detrimental effects, particularly in enclosed indoor spaces where concentrations can accumulate.

To address this concern, stringent regulations and standardized testing methods have been developed to monitor and control formaldehyde emissions from products, especially those destined for indoor use. Among the most widely recognized and influential are ASTM D6007 and the California Air Resources Board (CARB) Formaldehyde Emission Standards.

ASTM D6007: The Small-Scale Chamber Test Method

1.1 An Overview of ASTM D6007: Measuring Formaldehyde Emissions in a Controlled Environment

ASTM D6007, formally titled "Standard Test Method for Determining Formaldehyde Concentrations in Air from Wood Products Using a Small-Scale Chamber," provides a standardized laboratory procedure for quantifying formaldehyde emissions from wood products. This method is widely used to assess the emission potential of various wood-based materials intended for indoor use, allowing manufacturers and regulators to evaluate product compliance with emission standards.

1.2 The Testing Procedure: A Step-by-Step Guide to Emission Measurement

The ASTM D6007 test procedure involves a series of carefully controlled steps to accurately measure formaldehyde emissions. These steps include:

i) Test Specimen Preparation: A representative sample of the wood product is cut to a specified size (typically 150 mm x 150 mm) and conditioned at a controlled temperature (23 ± 2 °C) and humidity (50 ± 5 % relative humidity) until it reaches equilibrium moisture content. This ensures that the sample is in a stable state before testing.

ii) Chamber Preparation: The small-scale chamber is thoroughly cleaned and conditioned to the desired temperature and humidity levels. This minimizes background formaldehyde levels and ensures accurate measurements.

iii) Chamber Loading: The conditioned test specimen is carefully placed inside the chamber, ensuring that the emitting surface is exposed to the air. The orientation of the sample should be consistent for all tests.

iv) Chamber Operation: The chamber is sealed to create a closed environment, and the temperature, humidity, and air exchange rate are maintained at the specified levels. The air exchange rate is typically set to 1.0 ± 0.1 air changes per hour (ACH), simulating typical indoor ventilation.

v) Air Sampling: Air samples are collected from the chamber at specified time intervals (e.g., 24 hours, 48 hours, 72 hours). The sampling duration and frequency may vary depending on the purpose of the test and the expected emission profile of the material.

vi) Formaldehyde Analysis: The collected air samples are analyzed for formaldehyde concentration using the chromotropic acid method.

1.3 The Chromotropic Acid Method: Quantifying Formaldehyde with Spectrophotometry

ASTM D6007 relies on the chromotropic acid method for determining the formaldehyde concentration in the air samples. This method involves a series of chemical reactions and spectrophotometric measurements to quantify the amount of formaldehyde present. The key steps include:

i) Collection of Formaldehyde: Formaldehyde in the air sample is collected by bubbling the air through a solution of distilled water in an impinger. Formaldehyde dissolves in the water, forming a solution. This process effectively traps the formaldehyde from the air stream.

ii) Reaction with Chromotropic Acid: An aliquot of the formaldehyde solution is reacted with chromotropic acid in the presence of concentrated sulfuric acid. This reaction produces a purple-violet colored complex. The intensity of the color is directly proportional to the amount of formaldehyde present.

iii) Spectrophotometric Measurement: The absorbance of the colored solution is measured at a specific wavelength (typically 580 nm) using a spectrophotometer. The spectrophotometer measures the amount of light that passes through the solution, which is inversely related to the concentration of the colored complex.

iv) Calibration Curve: A calibration curve is prepared using known concentrations of formaldehyde standards. The absorbance values of the standards are plotted against their corresponding concentrations. This curve allows for the accurate determination of formaldehyde concentration in unknown samples.

v) Determination of Formaldehyde Concentration: The formaldehyde concentration in the air sample is determined by comparing the absorbance of the sample solution to the calibration curve. The concentration is then expressed in units of parts per million (ppm) or milligrams per cubic meter (mg/m³).

CARB Formaldehyde Emission Standards: Protecting California's Air Quality

2.1 Overview of CARB Standards: A Regulatory Framework for Formaldehyde Control

The California Air Resources Board (CARB) has established stringent formaldehyde emission standards for composite wood products sold or used in California. These standards, initially implemented in 2009 and further strengthened in 2011 and 2012, are designed to minimize formaldehyde exposure and protect the health of California residents. The CARB standards are widely recognized as among the most stringent formaldehyde emission regulations worldwide.

2.2 Emission Limits: Phase 1 and Phase 2 - Stricter Limits for a Healthier Environment

The CARB standards were implemented in two phases, with progressively lower formaldehyde emission limits to reduce formaldehyde exposure over time:

• Phase 1 (2009): Established initial formaldehyde emission limits for composite wood products, requiring manufacturers to reduce emissions.

• Phase 2 (2011-2012): Further reduced the formaldehyde emission limits to the following levels, representing a significant step towards minimizing formaldehyde exposure:

- Hardwood Plywood (HWPW): 0.05 ppm (parts per million)

- Particleboard (PB): 0.09 ppm

- Medium-Density Fiberboard (MDF): 0.11 ppm

These emission limits represent the maximum allowable formaldehyde concentration in air, as measured by the ASTM E1333 test method.

2.3 Testing Method: ASTM E1333 - The Large Chamber Test for Regulatory Compliance

The CARB formaldehyde emission standards require the use of ASTM E1333, titled "Standard Test Method for Determining Formaldehyde Concentrations in Air and Emission Rates from Wood Products Using a Large Chamber," to demonstrate compliance. This test method is similar to ASTM D6007 but utilizes a larger environmental chamber and a slightly modified analytical procedure, providing a more accurate assessment of formaldehyde emissions under realistic indoor conditions.

2.3.1 Key Differences Between ASTM D6007 and ASTM E1333: Chamber Size and Analytical Sensitivity

While both ASTM D6007 and ASTM E1333 assess formaldehyde emissions from wood products, they differ in several key aspects that influence the accuracy and applicability of the results:

• Chamber Size: ASTM D6007 uses a small-scale chamber, while ASTM E1333 employs a large-scale chamber. The larger chamber provides a more realistic simulation of indoor environmental conditions, accounting for factors such as air mixing and surface area to volume ratio.

• Air Exchange Rate: ASTM E1333 typically uses a lower air exchange rate than ASTM D6007, which more closely mimics the ventilation rates found in typical indoor environments. This lower air exchange rate allows for a more accurate assessment of formaldehyde concentrations under real-world conditions.

• Analytical Method: While both methods rely on the chromotropic acid reaction, ASTM E1333 uses a modified version of the method that is more sensitive and accurate at the lower formaldehyde concentrations required by the CARB standards. This enhanced sensitivity is crucial for accurately measuring emissions at the stringent CARB limits.

• Reporting of Results: ASTM E1333 reports both the formaldehyde concentration and the emission rate, while ASTM D6007 primarily reports the formaldehyde concentration. The emission rate provides additional information about the long-term emission potential of the material.

2.4 Third-Party Certification: A Cornerstone of CARB Compliance

To ensure compliance with the CARB formaldehyde emission standards, composite wood products must be certified by a CARB-approved Third-Party Certifier (TPC). The TPC plays a crucial role in verifying that manufacturers meet the requirements of the CARB regulation through rigorous testing, inspections, and quality control audits.

2.5 Labelling Requirements: Empowering Consumers with Information

To inform consumers about the formaldehyde emission performance of composite wood products, the CARB standards require that certified products be labeled with the following information, allowing consumers to make informed choices about the products they purchase:

• CARB Compliance Statement: A statement indicating that the product meets the CARB Phase 2 formaldehyde emission limits, providing assurance that the product has been tested and certified to meet the stringent CARB requirements.

• TPC Identification: The name or logo of the CARB-approved Third-Party Certifier, allowing consumers to verify the authenticity of the certification.

• Manufacturing Date: The date on which the product was manufactured, providing consumers with information about the age of the product and its potential for formaldehyde emissions.

This labeling allows consumers to easily identify and select composite wood products that meet the CARB standards, contributing to a healthier indoor environment and reducing their exposure to formaldehyde.

ASTM D6007 vs. CARB Formaldehyde Emission Standards: A Comparative Analysis

3. Key Differences: A Summary

• Scale of Testing: ASTM D6007 uses a small-scale chamber, while CARB standards mandate the use of the large-scale chamber test (ASTM E1333).

• Analytical Sensitivity: CARB standards require a modified version of the chromotropic acid method, which is more sensitive and accurate at lower formaldehyde concentrations.

• Emission Limits: CARB standards establish specific formaldehyde emission limits that must be met for product certification, whereas ASTM D6007 is primarily a test method for measuring formaldehyde concentrations.

• Third-Party Certification: CARB standards require third-party certification to ensure compliance, adding an extra layer of verification and accountability.

• Geographic Applicability: ASTM D6007 is widely used internationally, while CARB standards are primarily applicable in California, although their influence extends beyond the state due to market demand for compliant products.

4. Towards a Healthier Indoor Environment

ASTM D6007 and the CARB Formaldehyde Emission Standards represent significant advancements in our ability to assess and control formaldehyde emissions from wood products. While ASTM D6007 provides a standardized test method for measuring formaldehyde concentrations, the CARB standards establish specific emission limits and require third-party certification to ensure compliance, offering a more comprehensive approach to protecting public health.

By understanding the requirements of these standards, manufacturers, suppliers, and consumers can make informed choices to reduce formaldehyde exposure and improve indoor air quality. As research continues to uncover the long-term health effects of formaldehyde, these standards will likely evolve to further protect public health and promote the development of safer, more sustainable building materials and consumer products. The ongoing commitment to reducing formaldehyde emissions is a crucial step towards creating healthier and more comfortable indoor environments for all.