ESD Properties and Characteristics We Test For
At MicroStat Laboratories/River’s Edge Technical Service, we conduct ESD testing for most of the relevant product and material properties and characteristics. Listed below are the generic ESD properties and characteristics that we test for and the ESD test methods and standards covering these properties and characteristics.
Static Decay/Static Dissipation
A measurement of the time required for an electrostatic charge to dissipate
to a specified level. The time required for an electrostatic potential
to be reduced to a given percentage (usually 10%) of its initial value.
FTMS 191-5931: Electrostatic Decay of Fabrics
FTMS 101C Method 4046: Electrostatic Decay
Electrostatic Discharge Shield
A barrier or enclosure that limits the passage of current and attenuates
an electromagnetic field resulting from an electrostatic discharge.
ANSI/ESD STM11.31: Bags (Electrostatic Shielding)
ANSI/ESD S541: Packaging Materials for ESD Sensitive Items
Electrostatic Charge Generation
The level of electrostatic charge generated on an object in response to
an activity such as triboelectric charge generation.
ANSI/ESD STM97.2: Floor Materials and Footwear Voltage Measurement in Combination with a Person
ESD ADV11.2: Triboelectric Charge Accumulation Testing
Point-to-Point Resistance
Measure of the electrical resistance between two points on the surface
of a material.
ANSI/ESD STM2.1: Resistance Test Method for Electrostatic Discharge Protective Garments
ANSI/ESD S4.1: Worksurfaces—Resistance Measurements
ANSI/ESD STM7.1: Floor Materials—Resistive Characterization of Materials
ANSI/ESD STM11.13: Two-Point Resistance Measurement
ANSI/ESD SP15.1: In-Use Resistance Testing of Gloves and Finger Cots
NFPA 99: Health Care Facilities
Resistance to Ground
The resistance in ohms measured between a single electrode placed on a
surface and ground.
ANSI/ESD S1.1: Evaluation, Acceptance, and Functional Testing of Wrist Straps
ANSI/ESD S4.1: Worksurfaces—Resistance Measurements
ANSI/ESD STM7.1: Floor Materials—Resistive Characterization of Materials
ANSI/ESD STM9.1: Resistive Characterization of Footwear
ANSI/ESD STM12.1: Seating-Resistive Measurement
ANSI/ESD STM13.1: Electrical Soldering/Desoldering Hand Tools
ANSI/ESD STM97.1: Floor Materials and Footwear—Resistance in Combination with a Person
ASTM F-150: Flooring Resistance
ESD SP9.2: Resistive Characterization of Foot Grounders
NFPA 99: Health Care Facilities
Resistance to Groundable Point
The resistance in ohms measured between a single electrode placed on a
surface and a groundable point.
ANSI/ESD S4.1: Worksurfaces—Resistance Measurements
ANSI/ESD STM7.1: Floor Materials—Resistive Characterization of Materials
ANSI/ESD STM97.1: Floor Materials and Footwear—Resistance in Combination with a Person
Surface Resistance
The ratio of DC voltage to the current flowing between two electrodes of
specified configuration that contact the same side of a material. This
measurement is expressed in ohms.
ASTM F-150: (Flooring Resistance)
ANSI/ESD STM2.1: Resistance Test Method for Electrostatic Discharge Protective Garments
ANSI/ESD S4.1: Worksurfaces—Resistance Measurements
ANSI/ESD STM7.1: Floor Materials—Resistive Characterization of Materials
ANSI/ESD STM11.11: Surface Resistance Measurement of Static Dissipative Planar Materials
ANSI/ESD STM11.13: Two-Point Resistance Measurement
ANSI/ESD SP15.1: In-Use Resistance Testing of Gloves and Finger Cots
ANSI/ESD S541: Packaging Materials for ESD Sensitive Items
Surface Resistivity
For electric current flowing across a surface, the ratio of DC voltage
drop per unit length to the surface current per unit width. In effect,
the surface resistivity is the resistance between two opposite sides
of a square and is independent of the size of the square or its dimensional
units. Surface resistivity is expressed in ohms/square.
AATCC 76: Electrical Surface Resistivity of Fabrics
AATCC 84: Electric Resistivity of Yarns
ASTM D-257: Volume and Surface Resistivity of Electrically Insulating Materials
Volume Resistance of Static Dissipative Materials
The ratio of the DC voltage to current passing between tow electrodes,
or a specified—configuration, that contact opposite sides of the material
or object under test. Volume resistance of static dissipative material
is reported in ohms.
ANSI/ESD STM11.12: Volume Resistance Measurement of Static Dissipative Planar Materials
ANSI/ESD S541 (Packaging Materials for ESD Sensitive Items)
Volume Resistivity
The ratio of the DC voltage per unit thickness to the amount of current
per unit area passing through a material. Volume resistivity is given
in ohm-centimeters
ASTM D-257: (Volume and Surface Resistivity of Electrically Insulating Materials)
ASTM 991: (Surface Resistivity)
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