Work Pants & Shorts

The Difference Between Inherent FR and Treated FR Workwear

When it comes to protecting workers from flash fires, arc flashes, and other thermal hazards, not all protective workwear is created equal. The primary distinction lies in how the fabric achieves its flame-resistant properties. The two main categories are inherently flame resistant (FR) and flame retardant (coated or treated). The fundamental difference is that inherent FR fabrics have the flame resistance built into their very fibers, while flame retardant fabrics are chemically treated to become resistant to flames.

Inherent Flame Resistant (FR) Workwear

Inherent FR workwear is made from fibers that are naturally resistant to ignition due to their chemical structure. These fibers, such as aramids and modacrylics, are engineered to be non-flammable from their creation.

Key Characteristics:

• Permanent Protection: The flame-resistant properties are an integral part of the fabric and cannot be washed out or worn away over time. This ensures the garment provides consistent protection throughout its lifespan.
• Durable: Inherent FR fabrics are generally very durable and can withstand numerous industrial launderings without compromising their protective qualities.
• Higher Initial Cost: Due to the specialized nature of the fibers, inherent FR workwear typically has a higher upfront cost. However, its longevity can make it more cost-effective in the long run.
• Comfort: Modern inherent FR fabrics are often lightweight, breathable, and designed for comfort, which can improve worker compliance.

Flame Retardant (Coated) Workwear

Flame retardant workwear, also known as treated FR, is made from fabrics like cotton or cotton blends that have been chemically treated to impart flame resistance. The chemical treatment creates a barrier on the fabric that slows down or prevents the spread of flames.

Key Characteristics:

• Applied Protection: The flame-resistant properties are the result of a chemical coating applied to the fabric.
• Limited Lifespan: The effectiveness of the flame-retardant treatment can diminish over time with repeated washing, wear, and exposure to certain chemicals (like bleach). It is crucial to follow the manufacturer's laundering instructions precisely to maintain the garment's protective qualities.
• Lower Initial Cost: Treated FR workwear is generally less expensive to produce, making it a more budget-friendly option in the short term.
• Comfort: These garments often have the familiar feel of cotton, which many workers find comfortable. However, they can sometimes be heavier and less breathable than their inherent FR counterparts.

Ultimately, the choice between inherent FR and flame-retardant workwear depends on the specific hazards of the workplace, the frequency of wear and laundering, and the overall budget for personal protective equipment (PPE). For high-risk environments where long-lasting, reliable protection is paramount, inherent FR is often the preferred choice. For situations with lower risk or where garments are replaced frequently, treated FR can be a viable and economical option.