Biflex: FMC's bifenthrin termiticide

Biflex is FMC’s brand name for a bifenthrin-based chemical soil termiticide, one of the most-searched termite-product names in Australia. It is sold in Biflex Aqua (water-based) and Biflex Ultra (higher-concentration) formulations, applied as a pre-construction perimeter and under-slab chemical barrier by licensed pest-management technicians.

What it actually is

The brand is the wrapper; the chemistry is bifenthrin, a synthetic pyrethroid termiticide. The full picture (mode of action, repellent contact-kill mechanism, ~10-year label life, install rules, NCC and AS 3660 obligations) lives in the canonical article: bifenthrin.

A quick contrast for procurement:

• Biflex (FMC): bifenthrin, repellent, soil treatment.
• HomeGuard (FMC): bifenthrin in a treated-sheet system, distinct product.
• Termidor (BASF): fipronil, non-repellent, the opposite mode of action.

If the spec says “Biflex”, the active is bifenthrin and the install logic is repellent-barrier (continuous, no gaps). Substituting another brand without matching the active and the mode is a system change.

Why it matters

A builder rarely chooses between brands; the pest technician does, against the site and the management plan. But the builder is often the person who keeps the supplier docket and the treatment certificate, and the docket should say what was actually applied. Biflex on the docket = bifenthrin chemistry; treat the barrier per the bifenthrin install rules.

Biflex products are APVMA-registered (Australian Pesticides and Veterinary Medicines Authority) and applied as part of an AS 3660 termite management system required by NCC 2022 Volume Two for Class 1 buildings in termite-prone areas.

Also known as: Biflex, Biflex Aqua, Biflex Ultra.

Category: Termite management / brands

Related

• Bifenthrin (canonical)
• Termite barriers
• Fipronil (alternative active)

See also

• Termiticide

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Last updated: 2026-05-29. Verified: 2026-05-29. Quarterly review for currency.