PortwestSKU: PW-FR421KHR30

Portwest FR421 Bizflame FR Work Pants

$66.73

FR421 Bizflame 88/12 FR Pants deliver dependable dual‑hazard protection with a lightweight, comfortable feel designed for long shifts in hazardous environments. Made from soft yet durable Bizflame 88/12 fabric, these pants provide certified flame resistance for the life of the garment and strong arc‑flash protection. With practical pocketing, an adjustable hem, and a fully elasticated waistband, they offer everyday functionality without compromising safety.


Key Features:



  • Constructed from Bizflame 88/12 fabric (88% cotton / 12% polyamide, 237g) for comfort and durability.

  • Dual‑hazard protection against heat and electric arc exposure.

  • ARC2 with ATPV 8.2 cal/cm² (HAF 69.1%).

  • Certified to:

    • NFPA 2112

    • NFPA 70E

    • ASTM F1506

    • ASTM F1959/F1959M‑12

    • EN ISO 11612 (A1+A2, B1, C1)

    • IEC 61482‑2 / IEC 61482‑1‑1 (Elim 9.1 cal/cm²)

    • CE‑CAT III



  • Lightweight, comfortable design suitable for all‑day wear.

  • Easy‑access cargo pockets and a conveniently placed rule pocket.

  • Two back patch pockets for additional storage.

  • Concealed cell phone pocket for secure carry.

  • Fully elasticated waistband for enhanced comfort and flexibility.

  • Adjustable hem accommodates multiple leg lengths.

  • 40+ UPF rated fabric blocks 98% of UV rays.

CLICK HERE to view the sizing chart. A separate tab will open with the details for easy reference!

Ordering Questions

When will my order ship?

We aim to have all non-imprinted orders shipped within 3-5 business days after the order is placed!

Once your order ships, you’ll receive a confirmation email with tracking details. At this time, we ship to addresses within the contiguous United States.

We ship via UPS or USPS, depending on the size, weight, and destination of your order. Shipping method selection is handled automatically to ensure the best delivery option.

Please note that delivery times shown at checkout are estimates and begin once your order has shipped. Shipping delays caused by the carrier or weather are outside of our control.
How do returns work?

We want you to feel confident in your purchase. If an item doesn’t fit or isn’t quite what you expected, you can request a return directly from your order page using the 'Request Return' option.

Once your request is submitted, it goes directly to our Support Team. If the item is eligible, we’ll email you with return instructions. An approved RMA is required before sending any items back.

Return requests must be submitted within 30 days of receiving your order.

Returned items must be in new, resalable condition with original tags and packaging. All returns are inspected upon arrival to ensure they meet eligibility requirements before a refund is issued.

Please note:

  • Custom or imprinted items are final sale and not eligible for return
  • Return shipping is the customer’s responsibility
  • We recommend using UPS, USPS, or FedEx and keeping your tracking number, as we cannot be responsible for lost return shipments
Do you offer discounts for large orders?

We do! If you’re planning a large order of 50 units or more, you can share the details by clicking here to open our Bulk Request Form. We’ll put together a tailored quote for you and follow up with any questions to keep everything moving smoothly.

Have a Bulk Request? Fill out our form for a quote.