Fabric, decoded

What do fire ratings actually mean for stage drapes?

IFR, DFR and NDFR - and how long each one lasts

A fire rating tells you two things: how a fabric resists catching and carrying flame, and how long that protection lasts. In Australia the benchmark is AS 1530.2, and the certificate that matters covers the finished drape, not the roll of fabric it was cut from.

6 minute read · Updated 21 July 2026

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Drape Selector

01What is the job?

House curtain

Masking legs

Cyclorama

02Which fabric?

VelvetIFR

Wool sergeIFR

MoltonNDFR

03How full should it hang?

Flat

75%

100%

04How does it open?

Traveller

Guillotine

Tableau

05What size?

FabricWool serge

FR classIFR

Size12.0 x 7.0 m

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Step 1 of 5 · The job

The test behind the rating

Fire ratings are not marketing language. Each one traces back to a laboratory test under the AS/NZS 1530 series, and two parts of that series do the work for stage drapes.

AS 1530.2 is the vertical burn test. A fabric sample is ignited and measured for how readily flame takes hold and travels, and the result is expressed as a Flammability Index. In Australia, compliant theatre fabric needs an index of 10 or below. New Zealand sets the bar at 6.

AS 1530.3 measures early fire hazard properties: how easily the material ignites, how far flame spreads across it, and how much heat and smoke it gives off. Where 1530.2 asks whether a fabric will carry flame, 1530.3 describes how it behaves while a fire is developing.

So when a supplier says a drape is flame retardant, there are two questions worth asking before anything hangs: which test sits behind the claim, and what the number was.

Technician in respirator and gloves spray-applying fire retardant treatment to hung black stage drapes — Fire retardant treatment applied by spray, with the drapes in place. Every treatment leaves with a certificate for the finished drape.

IFR, DFR, NDFR: what the letters tell you

The rating on the label answers a different question to the burn test. The test says how the fabric performed; the rating says where that performance comes from, and that is what decides how long it lasts.

Rating	Stands for	Where the protection lives	How long it lasts	Typical fabrics
IFR	Inherently Flame Retardant	Woven into the fibre itself	The life of the fabric. No retreatment.	Wool serge, PolyCyc, sheer voile
DFR	Durably Flame Retardant	A chemical treatment engineered to hold through cleaning cycles	Years. Retreat every 2 to 3 to stay certain.	RevPro Blockout
NDFR	Non-Durably Flame Retardant	A treatment sitting on the surface of the fabric	Until moisture, washing or wear undoes it. Retreat every 2 to 3 years, sooner with exposure.	Turo molton, sharkstooth gauze, filled cloth

Two footnotes worth pinning to the noticeboard. Velvets and velours can be either inherently retardant or surface-treated depending on the fibre - the label tells you which, the look of the fabric does not. And a drape with no rating at all is treated as NFR, not flame retardant, until it has been tested or treated. The full breakdown by fabric family, weight and width lives in our fabric library.

The compliance trap

A fabric certificate is not a drape certificate.

Here is the one spec venues most often get wrong. Flame retardant fabric off the roll does not make a compliant drape. Certification has to cover the finished article - cut, sewn, weighted and headed - because that is what hangs above your stage, and that is what an auditor will ask about.

It is why every drape that leaves our workshop is certified as the finished piece. When our machinists sew in a chain pocket or an Option D header, the certificate describes that drape, not the bolt of cloth it started as. If the paperwork in your compliance file names a fabric rather than a finished drape, close that gap before an audit finds it.

What happens at audit time

When a fire safety audit or an insurance renewal lands, the question is rarely whether your drapes look right. It is whether you can produce a current certificate for what is hanging. If the file is in order, the audit is a filing exercise.

And if it is not, that is a solvable problem rather than a replacement bill. Existing drapes can be tested, treated and re-certified as they are - we do it for theatres, schools, galleries and event venues across Australia. The certificate goes back in the file, and the drapes go back to work.

When to retreat

For DFR and NDFR drapes, plan on retreatment every 2 to 3 years. Where a drape sits inside that window depends on how hard it works: use intensity, moisture exposure and cleaning history all draw the date closer, and high-use stock retreats sooner.

Between treatments, the fabric will tell you when protection is failing - if you know what to look for:

A white tide mark. Moisture wicks the treatment through the fabric and leaves a salt line where it dried. This is the classic sign a surface treatment has been compromised.
A wet history. Rained on in transit, washed, or stored damp - if a treated drape has been wet, retreat it before it hangs again.
Visible wear. Fraying, pilling or thinning at edges and hems.
A changed hand. Stiffness or discoloration where the fabric has lost its original feel.

White salt tide mark running along the bottom hem of a black stage drape, a sign the fire retardant treatment has been compromised by moisture — The tide mark up close: moisture has carried the treatment to a dried salt line along the hem. This drape is due for retreatment before it hangs again.

Two habits protect the rating between treatments. Vacuum regularly - even inherently retardant fabric can carry fire under a load of dust, which makes vacuuming fire prevention rather than housekeeping. And keep wet cleaning away from treated fabric: dry cleaning does not strip a treatment, but a wet wash can destroy an NDFR finish. An annual inspection picks all of this up before it becomes a problem.

Retreatment itself follows the same sequence every time: evaluate, clean and prepare, apply by immersion or spray, dry, quality-check, certify. The drape comes back with its certificate and aftercare guidance, and the clock resets.

How fire treatment works →

Three things to do this week

Find out what is hanging. Every drape, every space: IFR, DFR or NDFR. Many venues do not know, and establishing it is the starting point for staying compliant.
Find the certificates. Check each one is current, and that it describes the finished drape rather than the fabric.
Diary the retreat dates. Two to three years from the last treatment, sooner for hard-working stock.

That is the whole discipline. Fire ratings stop being intimidating once they are decoded: they are a maintenance schedule wearing a compliance label, and we have been sewing, treating and certifying to it since 2001.

Keep the specs within reach

Fabric families, weights, widths and fire ratings for everything we make, in one reference.

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