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How Ethylene Bis-Stearamide Enhances Fire Retardancy in Plastics

by:Sainuo     2023-07-22

How Ethylene Bis-Stearamide Enhances Fire Retardancy in Plastics

Plastic materials are widely used in diverse applications such as packaging, construction, transportation, and electronics, among others, due to their excellent properties such as durability, flexibility, and light weight. However, plastics are also highly combustible and can contribute to the spread of fires, leading to enormous property damage, injury, or loss of life. Therefore, fire retardancy is a critical requirement for plastic products, especially in high-risk environments such as building codes, automotive interiors, and electronic equipment. Ethylene bis-stearamide (EBS) is a popular additive that enhances the flame retardancy of plastics. This article examines how EBS works, its applications, and its advantages and limitations.

What is Ethylene Bis-Stearamide?

Ethylene Bis-Stearamide (EBS) is a synthetic wax that contains two long chains of stearic acid, a saturated fatty acid found in many animal and plant fats. It is made by reacting ethylene diamine, an organic compound used in the production of adhesives and detergents, with two molecules of stearic acid. EBS is available as a white powder or granule and has a melting point of 132-137°C. EBS is non-toxic, non-tacky, and insoluble in water, oils, and most organic solvents, making it suitable for use in various applications.

How Does EBS Enhance Fire Retardancy in Plastics?

EBS acts as a flame retardant additive in plastics by reducing the flammability and smoke release properties of the material. When plastics are exposed to heat or flame, they decompose, releasing volatile organic compounds (VOCs) that fuel the fire and produce thick black smoke, decreasing visibility and oxygen supply. EBS works by forming a protective barrier around the plastic particles, which acts as a physical shield against heat and flame. Moreover, EBS catalyzes the decomposition of the plastic material at lower temperatures, leading to the release of charred residue that forms a thick, stable layer on the surface and prevents further combustion. This process is called intumescence, and it effectively reduces smoke emission, heat transfer, and fire spread.

What are the Applications of EBS in Plastics?

EBS is a versatile additive that can be used in various types of plastics, including polyolefins, thermoplastic elastomers, and polystyrenes. EBS is compatible with other additives such as antioxidants, UV stabilizers, and processing aids, and can be incorporated into the plastic matrix by mixing, extrusion, or molding. EBS is widely used in the following applications:

1. Building Materials: EBS is used in construction materials such as PVC pipes, cables, roofing sheets, and insulation panels, to prevent accidental fires and limit smoke development.

2. Automotive Interiors: EBS is used in car seats, dashboards, and door panels, to comply with safety standards and reduce the risk of fire ignition and propagation in case of accidents.

3. Electronics: EBS is used in electronic casings, connectors, and housings, to protect sensitive components from fire and heat damage, and ensure the safety of users.

4. Packaging: EBS is used in food packaging films, containers, and bottles, to increase their resistance to fire and protect the contents from contamination.

5. Textiles: EBS is used in fabric coatings and fibers, to improve their flame retardancy and durability, and comply with fire safety regulations in public spaces such as hotels, theaters, and hospitals.

What are the Advantages and Limitations of EBS?

EBS has several benefits as a flame retardant additive in plastics, including:

1. High Efficiency: EBS is a highly efficient flame retardant that requires a low loading level to achieve a significant improvement in fire retardancy. The optimal dosage of EBS varies depending on the type of plastic, processing conditions, and flame retardancy requirements. Generally, a loading level of 1-5% of EBS is sufficient to achieve good results.

2. Wide Applicability: EBS can be used in various types of plastics, and its effectiveness is not affected by the color or transparency of the material. EBS is also compatible with other additives and processing aids, which enhances its versatility and flexibility.

3. Cost-Effective: EBS is a cost-effective flame retardant additive that does not add significant extra costs to the production process. Moreover, the use of EBS can reduce the overall costs of fire safety measures and insurance premiums.

However, EBS also has some limitations that should be taken into account:

1. Limited Thermal Stability: EBS has a limited thermal stability, and its performance can be affected by external factors such as UV radiation, humidity, and processing conditions. Therefore, it is crucial to select the appropriate grade and dosage of EBS according to the specific application and environment.

2. Incompatibility with Some Polymers: EBS is not compatible with some polymers, such as polyesters and polycarbonates, which may degrade or discolor the material. Therefore, alternative flame retardant additives should be used for these materials.

3. Environmental Concerns: EBS is a synthetic wax that is not biodegradable and may accumulate in the environment. Therefore, the disposal and recycling of EBS-containing plastics should be handled carefully to minimize its impact on the ecosystem.


Ethylene Bis-Stearamide (EBS) is a widely used flame retardant additive in plastics, which enhances their fire resistance and smoke suppression properties. EBS works by forming a physical and chemical barrier around the plastic material, which prevents the spread of flames and reduces the release of toxic gases. EBS is versatile, cost-effective, and compatible with various plastics, making it suitable for many applications such as building materials, automotive interiors, electronics, packaging, and textiles. However, EBS also has some limitations, such as limited thermal stability, incompatibility with some polymers, and environmental concerns, which should be taken into account when selecting the appropriate flame retardant additive.

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