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Standard

ANSI/ESD STM7.1-2020

The test method for qualifying a floor material before installation and for accepting and monitoring it afterwards.

2.5 x 104 to 1.0 x 106ohmsANSI/ESD STM7.1 / ASTM D257 (as cited on manufacturer TDS)
1.0 x 106 to 1.0 x 109ohmsANSI/ESD STM7.1
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What it means for your floor

Where conductive and static dissipative sit on the resistance scale 10³10⁴10⁵10⁶10⁷10⁸10⁹10¹⁰10¹¹10¹²10¹³ CONDUCTIVE STATIC DISSIPATIVE INSULATIVE 2.5 x 10⁴ to 1.0 x 10⁶ ohms. Fastest bleed. Specified where a spark is the hazard. Anything above 10⁹ is an insulator and holds a charge instead of moving it. ANSI/ESD STM7.1 · bands published by the ESD Association
The two static control bands, drawn where they sit on the scale. Everything to the right of 10⁹ ohms is an insulator.
01

Printed two ways, same document

You will see this cited as STM7.1 and as S7.1, including on manufacturer data sheets. Many report templates still print S7.1. They refer to the same floor resistive characterization method.

02

Point to point and point to ground

The method covers resistance measured between two points on the floor and from a point on the floor to the building ground. Both readings matter: a floor can be continuous across its own surface and still not be tied properly to ground.

03

Before and after

It is used twice. Once to qualify a material before it is chosen, and again to accept and then monitor the installed floor. The second use is what makes a resistance log a living document rather than a one day certificate.

The other standards

ANSI/ESD S20.20-2021ANSI/ESD STM97.1-2025ANSI/ESD STM97.2-2016IEC 61340-5-1:2024ASTM F2170-19aDESR 6055.09FAA-STD-019NFPA 99 (2024)ISO 14644-1:2015ESD TR53-01-22CSI 09 67 23
ANSI/ESD STM7.1-2020what it asks of a floor
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