Hydroquinone (C6H6O2) is a chemical commonly used in the manufacturing industry, but it can cause serious health effects for workers. This article will help you understand the health effects of hydroquinone and the necessary protective measures when working with this chemical.
1. What is Hydroquinone?
C6H6O2 is the chemical formula for an organic compound called hydroquinone, also known by other names such as 1,4-benzoquinol or quinol. It is a clear, colorless liquid, readily soluble in water and organic solvents. In its chemical structure, a benzene ring is connected to two hydroxyl (-OH) groups at the para position (opposite each other) on the benzene ring.
This substance is primarily used in industry, especially in the production of products such as dyes, cosmetics, and antioxidants. In addition, hydroquinone also plays an important role in the chemical industry as a component in oxidation or reduction processes. Due to its strong antioxidant properties, it is also used in pharmaceutical and cosmetic applications, such as for skin lightening.
However, despite its many useful applications, hydroquinone can also cause some undesirable health effects, especially when workers are exposed to it in the workplace.
| No. | Chemical Name in Vietnamese | Chemical Name in English | HS Code | CAS Number | Chemical Formula |
| 1. | Hydroquinon | Hydroquinone | 29072200 | 123-31-9 | C6H6O2 |
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2. Where does Hydroquinone originate from in the production process?
During the production process, hydroquinone can be generated from various sources, depending on the specific industry and application. One of the main sources of this substance is in the dye manufacturing industry, where chemical compounds are oxidized to form hydroquinone, which is used in the dyeing stages of fabric, paper, or leather.
In addition, hydroquinone is also produced from the reduction of other compounds containing a carbonyl group, such as benzoquinone, through chemical reactions in chemical processing plants. This substance can also be generated during plastics production processes, thanks to chemical reactions between different components in the raw materials.
In the cosmetics industry, hydroquinone is also used for skin lightening and is synthesized during the processing of beauty products, especially in creams for treating melasma and freckles.

3. Industries that use Hydroquinone in production
In production, hydroquinone is widely used in many different industries due to its special chemical properties and uses. One of the main industries that use hydroquinone is the pharmaceutical and cosmetics industry. In this sector, hydroquinone is primarily used in skin lightening products, such as melasma treatment creams, skin whitening creams, and anti-aging products. This substance helps reduce the formation of melanin, thereby helping to lighten dark spots and freckles on the skin.
In addition, the food processing industry may use hydroquinone in certain applications, such as an antioxidant in processed food products, to extend shelf life and maintain product color stability. However, the use of hydroquinone in food is restricted and must comply with strict regulations.
The printing industry is another field that uses hydroquinone, especially in the development processes for photographic film and paper. Hydroquinone plays an important role in photo processing solutions, helping to create sharp and detailed prints. Furthermore, hydroquinone is also used in the production of industrial dyes, particularly in dyes for fabric, leather, and paper, thanks to its ability to improve the color fastness and shade of the products.
Finally, hydroquinone is also present in the plastics and rubber manufacturing industries, where it is used as an antioxidant to protect products from degradation caused by light and high temperatures.
4. How does Hydroquinone affect workers?
When exposed to hydroquinone in the workplace, workers can face many health risks, depending on the level of exposure and the protective measures taken. This substance can be harmful mainly through skin contact, inhalation, and ingestion, especially if appropriate protective measures are not in place.
Long-term exposure to hydroquinone can cause skin irritation, especially for those with sensitive skin. Symptoms may include redness, itching, or dermatitis. In addition, one of the more serious effects is that hydroquinone can cause a condition called ochronosis, causing the skin to darken or develop dark patches. Some studies have also shown that hydroquinone can cause hyperpigmentation with prolonged contact.
Besides the effects on the skin, inhaling hydroquinone vapor in the air can also affect the respiratory system of workers. Symptoms may include coughing, shortness of breath, or bronchitis. Especially in environments with high concentrations, such as cosmetics or dye manufacturing plants, the risk of respiratory problems is even greater.
If hydroquinone is accidentally ingested, workers may experience symptoms of poisoning, including abdominal pain, vomiting, or diarrhea. This substance can damage the digestive system if not treated promptly.
With such potential negative effects, implementing protective measures such as wearing masks, gloves, and protective clothing is essential when working with hydroquinone.
5. Permissible safe concentration of Hydroquinone for human exposure
The safe concentration of hydroquinone for human exposure is regulated based on scientific research and international occupational safety standards. However, this safety level depends on the type of work, duration of exposure, as well as the protective measures used by the worker in the work environment.
According to guidelines from the World Health Organization (WHO) and the U.S. Occupational Safety and Health Administration (OSHA), the concentration of hydroquinone in the workplace air should not exceed 0.5 mg/m³ over an 8-hour work shift. This is the maximum safe level to avoid negative health effects for workers, including skin and eye irritation, and respiratory problems. However, in some specific industries, such as cosmetics or dye manufacturing, this concentration may be adjusted according to the specific regulations of the industry.
In addition, for products containing hydroquinone in cosmetics, the maximum safe concentration allowed for use on the skin is usually limited to 2%, to avoid the risks of dermatitis or adverse effects on skin pigmentation. Nevertheless, prolonged exposure or exposure to higher concentrations can lead to serious skin problems, such as hyperpigmentation or dermatitis.
To ensure safety, workers must strictly adhere to regulations on hydroquinone concentration in the air and use full personal protective measures.

At a basic level, when working in an industrial environment, it is important to adhere to safety standards and limit exposure to Hydroquinone. Organizations such as the Occupational Safety and Health Administration (OSHA) in the United States provide guidelines and safety principles to protect workers from the negative impacts of chemical substances.
6. Measures to minimize the impact of Hydroquinone on workers’ health
To minimize the impact of hydroquinone on workers’ health, implementing effective protective measures is very important. First of all, factories and production facilities that use hydroquinone must ensure that the work environment is always well-ventilated and has a good ventilation system. This helps to minimize the accumulation of the chemical in the air, thereby reducing the risk of inhaling the toxic vapors of hydroquinone.
In addition, workers must be fully equipped with personal protective equipment, including masks, gloves, safety goggles, and full-body protective clothing when in contact with hydroquinone. Protective masks help prevent the inhalation of dust or chemical vapors, while gloves and safety goggles will help protect the skin and eyes from direct contact with hydroquinone, especially during mixing, packaging, or production stages.
Besides personal protective measures, checking and monitoring the concentration of hydroquinone in the air is also very necessary. Production facilities need to maintain measuring devices to ensure that the concentration of hydroquinone does not exceed the permissible safe level. At the same time, employees need to be trained on preventive measures, how to recognize signs of poisoning, and how to respond in case of an incident.
Work processes also need to be designed to minimize direct contact with hydroquinone. This can be achieved through the use of automation in production or by improving packaging and product handling stages so that workers do not have to come into direct contact with the chemical.
Finally, organizing regular health check-up programs for workers is very important. Through this, health problems related to hydroquinone exposure can be detected early, helping to prevent serious diseases and ensure long-term safety for workers in the work environment.
Occupational safety training: Workers need to be trained and educated on the risks and safety measures when working with this type of chemical. This training should be provided periodically and regularly to ensure understanding and proper compliance with safety rules.
Periodically organize occupational environment monitoring in factories and enterprises, collect and analyze factors harmful to workers, and thereby adjust to reduce hazard levels to prevent occupational diseases for them.
7. National Occupational Environment Monitoring Center
Nam Viet’s Occupational Environment Monitoring Center is a professional unit specializing in monitoring and measuring the quality of the working environment across all provinces in Vietnam. With a team of experienced monitoring specialists, the center uses modern measuring equipment to ensure accuracy and reliability.
REGISTER FOR OCCUPATIONAL ENVIRONMENT MONITORING SERVICES
In addition to providing monitoring services, the center also assists clients in planning, handling, and tracking issues related to the occupational environment. With the motto “the customer is the center,” the center focuses on customer satisfaction, meets all customer needs, and is committed to providing the best solutions for businesses.
With investment in techniques, technology, and human resources, Nam Viet’s monitoring center has become one of the reputable units in the field of occupational environment monitoring in Ho Chi Minh City with the following objectives:
- We always value our brand reputation and the quality of our products and services.
- We provide our customers with the best and most suitable solutions possible.
- With a team of experienced and specialized Masters and Engineers, we aim to protect the environment and benefit businesses.

- By choosing the Nam Viet Environmental Monitoring team, your company will receive professional service from experts in the monitoring field. You will also receive the best cost incentives.
8. Quotation for Occupational Environment Monitoring
To help businesses conduct occupational environment monitoring professionally and effectively, Nam Viet provides our customers with a quality and reasonably priced quotation for occupational environment monitoring services.
- Our monitoring quotation provides detailed information on the pricing of the monitoring services we offer. This includes costs related to travel, measurement, analysis, and reporting of results. Customers can be completely assured of the accuracy and reliability of the monitoring result reports we provide.
- We are committed to always offering the most competitive and reasonable prices on the market, and we are also always ready to provide consultation and answer any questions about our monitoring services quickly and professionally.
- With Nam Viet’s monitoring quotation, customers can easily choose service packages that suit their needs. We are committed to bringing our customers the highest satisfaction with professional quality service.

