During the production process, exposure to Hexahydromethyl phthalic anhydride (C9H12O3) can cause serious health effects for workers. This article will help you understand the impact of this chemical and provide safety measures for the workplace.
1. What is Hexahydromethyl phthalic anhydride?
This substance has the chemical formula C9H12O3 and belongs to the phthalic anhydride group, an organic compound widely used in the chemical industry. Its structure includes a benzene ring with anhydride and methyl functional groups, creating its special chemical properties. Hexahydromethyl phthalic anhydride is often produced by hydrogenating phthalic anhydride, with the aim of improving stability and reactivity in final products.
With this structure, this compound has the ability to combine with various polymers or resins, acting as a curing agent or additive in many industrial products. It is commonly used in the production of plastics, paints, adhesives, and other applications related to polymerization. A clear understanding of the structural characteristics of this substance is an important basis for evaluating its physical and chemical properties, as well as its impact on the health of workers upon exposure.
| No. | Chemical Name in Vietnamese | Chemical Name in English | HS Code | CAS Number | Chemical Formula |
| 1. | Hexahydromethyl phthalic anhydrit | Hexahydromethyl phthalic anhydride | 29329990 | 25550-51-0; 48122-14-1; 57110-29-9; 57110-29-9 | C9H12O3 |
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2. Where does Hexahydromethyl phthalic anhydride originate from in the production process?
During the production process, this compound often arises from the manufacturing steps of plastics, paints, adhesives, and polymerization. In particular, it appears in processes that use phthalic anhydride as a primary raw material. When phthalic anhydride is hydrogenated, Hexahydromethyl phthalic anhydride is created as a byproduct or during the fabrication stages of polymer materials.
When these products are manufactured, this compound can evaporate or be dispersed into the air as dust or vapor, especially in areas containing machinery or furnaces. In addition, during transportation, storage, or mixing, this chemical can also be generated.

3. Industries that use Hexahydromethyl phthalic anhydride in production
This compound is widely used in many industries, especially in the production of plastics, paints, and adhesives. It is a key component in the manufacturing of heat-resistant plastics, epoxy resins, and vinyl ester resins, helping to improve the durability and heat resistance of the final product. Industries that manufacture plastics and composite materials frequently use this compound to create products with special properties such as high rigidity, impact resistance, and chemical resistance.
In addition, this compound is also used in the paint and coatings industry, especially in the formulation of heat-resistant paints, anti-corrosion paints, or protective coatings for metal surfaces. Adhesives and polymer products also often use Hexahydromethyl phthalic anhydride to increase durability and stability. Companies in the fields of building materials, automotive, electronics, and machinery manufacturing may also use this compound in their production processes.
4. How does Hexahydromethyl phthalic anhydride affect workers?
Exposure to this compound can cause many negative health effects for workers, especially when they work in an environment without proper protective measures. When inhaling dust or vapor of this substance, workers may experience respiratory problems such as coughing, shortness of breath, or respiratory tract irritation. Long-term exposure cases can lead to chronic lung diseases or bronchitis.
In addition, this compound can also cause skin and eye irritation upon direct contact. Workers may experience redness, itching, dermatitis, or mild burns in the area of skin contact with this substance. In severe cases, long-term exposure or exposure to high concentrations can lead to nervous system damage or affect liver and kidney function.
Studies have also shown that prolonged exposure to this compound may increase the risk of developing cancer or diseases related to the nervous system.
5. Permissible safe concentration of Hexahydromethyl phthalic anhydride for human exposure
The safe concentration of this compound for human exposure depends on the standards and regulations of health and occupational safety agencies. According to guidelines from the World Health Organization (WHO) and the Occupational Safety and Health Administration (OSHA), the maximum safe concentration of this chemical in the air must not exceed a certain level to avoid negative impacts on workers’ health.
Typically, the long-term exposure limit (TLV – Threshold Limit Value) for this compound in the air is very low, usually below 0.5 mg/m³, depending on each country and its occupational health protection standards. This exposure level is calculated to ensure it does not cause adverse health effects, including problems with the respiratory system, skin, and other organs of the body when working in an environment containing this compound for a long time.

At a basic level, when working in an industrial environment, it is important to adhere to safety standards and limit exposure to Hexahydromethyl phthalic anhydride. 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 Hexahydromethyl phthalic anhydride on workers’ health
To minimize the impact of this compound on workers’ health, strict protective and control measures must be implemented in the workplace. One of the most important measures is to improve the ventilation system in production areas. Ensuring good air circulation in the work area will help reduce the accumulation of toxic substances in the air, thereby minimizing the risk of inhaling dust or vapor of this chemical.
Using personal protective equipment (PPE) is another method that helps protect workers. Workers should be fully equipped with devices such as air-purifying respirators, chemical-resistant gloves, safety glasses, and protective clothing to prevent direct contact with this compound. This equipment will help protect workers from effects that can cause skin, eye, and respiratory irritation.
In addition, training and raising awareness among workers about the risks and preventive measures when working with this compound are also very important. Workers need to be trained on how to properly use protective equipment, recognize signs of poisoning, and how to handle incidents.
Furthermore, companies need to comply with regulations on chemical concentration limits in the air and regularly check the air quality in the work area. Close monitoring of exposure levels and regular health check-ups for workers will help detect early signs of poisoning and allow for timely intervention.
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.

