is polyurethane sealant toxic


Polyurethane Sealant: Debunking the Toxicity Myth


Polyurethane sealants are widely used in various industries for their excellent adhesive properties and flexibility. However, there have been concerns regarding their toxicity. In this article, we will delve into the subject and uncover the facts about polyurethane sealant's toxicity. Through discussing its chemical composition, exposure risks, application safety measures, and proper handling, we aim to debunk the myth surrounding its alleged harmful effects.

1. Understanding Polyurethane Sealant's Chemical Composition:

Polyurethane sealant is primarily made up of several components, such as a polyol, isocyanates, fillers, and additives. While isocyanates tend to be the most concerning component in terms of toxicity, it should be noted that polyurethane sealants undergo a curing process where the isocyanate reacts with water in the air to form a non-toxic, inert polyurethane material.

2. Evaluating Exposure Risks:

When handling polyurethane sealants, it's crucial to consider potential risks associated with exposure. Occupational exposure to uncured sealants, especially during the application process, could result in inhalation or dermal contact. However, once fully cured, the risk of toxicity diminishes significantly. It is important to note that prolonged exposure to uncured sealant should be avoided, and proper safety precautions should be followed during application.

3. Safety Measures during Application:

To ensure safe application of polyurethane sealants, it is essential to follow specific safety measures. These include working in a well-ventilated area, wearing appropriate personal protective equipment (PPE) such as gloves, safety goggles, and respiratory masks. Adequate ventilation helps in dissipating any fumes emitted during the curing process, minimizing the chance of exposure.

4. Potential Health Effects:

While polyurethane sealants are considered safe once fully cured, uncured sealants may pose health risks if proper precautions are not taken. Inhalation of uncured sealant fumes may cause respiratory irritation, triggering symptoms such as coughing, wheezing, and shortness of breath. Dermatitis or skin irritation can occur through direct contact with uncured sealant, leading to redness, itching, or rashes. However, it's important to emphasize that following recommended safety measures significantly reduces the likelihood of experiencing adverse health effects.

5. Handling and Storage Best Practices:

To further ensure safety when working with polyurethane sealants, proper handling and storage practices should be adopted. Storing sealant containers in a cool, dry place, away from open flames or ignition sources, is crucial. Additionally, containers should always be tightly sealed when not in use to prevent any unintentional release of fumes. It is also important to read and follow the manufacturer's instructions and safety guidelines provided on the product label.


Polyurethane sealants are widely used in multiple industries for their reliability and versatility. While concerns about its toxicity exist, it is crucial to understand the facts surrounding their potential harmful effects. By adhering to recommended safety precautions during application, handling, and storage, the risks associated with polyurethane sealants can be significantly minimized. Ultimately, when used and handled responsibly, polyurethane sealants provide valuable benefits without posing undue harm to human health and the environment.


Just tell us your requirements, we can do more than you can imagine.
Send your inquiry

Send your inquiry

Choose a different language
Current language:English