TEST REPORT32NorthSTAT-A-REST ESD footwear
TESTED FOR
Electrical Properties Using
Point-to-Point Resistance
Point-to-Groundable-Point ResistanceOperator Resistance to Ground Using ANSI/ESD STM97.1
Voltage Generation of an Operator per ANSI/ESD STM97.2

Report #: 2012-033 (Final)
October 21st, 2012
3907 Birmingham Ln. NW, Rochester, MN 55901 • Phone: 507-292-0230 • Fax: 507-292-0698 • www.microstatlabs.com

SUMMARY
Four samples (two sizes) of STAT-A-REST ESD footwear were submitted for testing of
their electrical properties using various industry standard test methods. Several point-topoint and point-to-ground measurements were made on each sample. In addition, operator
resistance to ground measurements were made using the methods called out in ANSI/ESD
STM97.1 - with the floor material being substituted with a stainless steel metal plate.
In addition to the “footwear only” tests, ANSI/ESD STM97.1 (Resistance in combination with
an operator) and ANSI/ESD STM97.2 (voltage generation of an operator) tests wereperformed using DESCO epoxy floor coating applied over a 3 foot x 3 foot plywood
substrate. One of the samples had a coating of a DESCO ESD floor finish over theconductive epoxy.
The electrical performance of the STAT-A-REST ESD footwear is excellent. The resistanceof footwear is in the low to mid-static dissipative range, and voltage generation data isextremely low.
EXPERIMENTAL AND DISCUSSION
The samples were conditioned at 50% and 12% R.H. and 72°F for 48 hours prior to testing.
Testing was performed in the conditioning environment.
Point-to-point resistance measurements were made on each sample by placing two 5-lbelectrodes on the bottom surface of the footwear, one on the toe and one on the heel of eachsample. The sample was placed on an insulative test bed for this test. Measurements werealso made of the inside of the footwear (all readings were insulative for this test).
Point-to-groundable point measurements were made by placing the sample on the insulative
test bed, then placing one 5-lb electrode on the toe and heel of each sample, and a second
electrode on the grounding strap.
Operator resistance-to-ground measurements were made using the test methods describedin ANSI/ESD STM97.1. This test is performed by having an operator don a footwear sample
properly, then stand on a stainless steel metal plate. Resistance measurements from theoperator’s hand to the metal plate are then made using both feet, followed by individual footmeasurements.
All resistance testing was carried out at 100 volts bias. Data from the footwear-only test isincluded below in Tables 1 and 2. Resistance data to a metal plate, using an operator
wearing the footwear, is included in Tables 3 and 4. Resistance data to the flooring material,using an operator wearing the footwear is included in Tables 5 and 6.
The walking voltage test was conducted on the epoxy flooring samples while wearing theshoe grounding devices. Table 7 summarizes the data obtained from this testing, whileFigures 1 through 4 show the walking voltage at each of the humidity conditions for theepoxy floor and the epoxy floor with coating respectively.

Report #: 2012-033

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October 21st, 2012

Table 1STAT-A-REST ESD FootwearElectrical Resistance Test Data @ 12% R.H. ConditionsSample#

Outside Heelto OutsideToe

Toe toGroundStrap

Heel toGround Strap

Inside Heelto InsideToe

1 (XL - R)

2.55 x 108 Ω

2.49 x 108 Ω

2.04 x 107 Ω> 1 x 1012 Ω

2 (XL - L)

2.71 x 108 Ω

2.33 x 108 Ω

2.25 x 107 Ω> 1 x 1012 Ω

3 (L - R)

2.25 x 108 Ω

2.04 x 108 Ω

2.63 x 107 Ω> 1 x 1012 Ω

4 (L - L)

2.62 x 108 Ω

2.28 x 108 Ω

1.24 x 107 Ω> 1 x 1012 Ω

Table 2
STAT-A-REST ESD Footwear
Electrical Resistance Test Data @ 50% R.H. Conditions

Report #: 2012-033

Sample#Outside Heelto OutsideToe

Toe toGroundStrap

Heel toGround Strap

Inside Heelto InsideToe

1 (XL - R)

1.32 x 108 Ω

1.29 x 108 Ω

4.34 x 106 Ω> 1 x 1012 Ω

2 (XL - L)

1.30 x 108 Ω

1.22 x 108 Ω

7.25 x 106 Ω> 1 x 1012 Ω

3 (L - R)

9.58 x 107 Ω

8.90 x 107 Ω

4.65 x 106 Ω> 1 x 1012 Ω

4 (L - L)

1.11 x 108 Ω

9.34 x 107 Ω

2.94 x 106 Ω> 1 x 1012 Ω

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Table 3STAT-A-REST ESD Footwear
In-Use Resistance Test Data @ 12% R.H. Conditions
Operator on a Metal Plate - ANSI/ESD STM97.1
SampleID

Both Feet

Left Foot
Only

Right Foot
Only

XL

8.17 x 106 Ω

9.25 x 106 Ω

6.94 x 106 ΩL

7.35 x 106 Ω

8.94 x 106 Ω

7.29 x 106 Ω

Table 4STAT-A-REST ESD Footwear
In-Use Resistance Test Data @ 50% R.H. Conditions
Operator on a Metal Plate - ANSI/ESD STM97.1
SampleID

Both Feet

Left Foot
Only

Right Foot
Only

XL

2.20 x 106 Ω

6.03 x 106 Ω

4.00 x 106 ΩL

2.52 x 106 Ω6.04 x 106 Ω

5.79 x 106 Ω

Table 5
STAT-A-REST ESD Footwear
In-Use Resistance Test Data @ 12% R.H. Conditions
Operator on ESD Floor - ANSI/ESD STM97.1

Report #: 2012-033

Both Feet

Left Foot
Only

Right Foot
Only

Floor
Alone

1.50 x 107 Ω

5.53 x 107 Ω

3.89 x 107 Ω

Floor
Wax

1.90 x 107 Ω

5.45 x 107 Ω

4.25 x 107 Ω

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October 21st, 2012

Table 6
STAT-A-REST ESD Footwear
In-Use Resistance Test Data @ 50% R.H. Conditions
Operator on ESD Floor - ANSI/ESD STM97.1
Both Feet

Left Foot
Only

Right Foot
OnlyFloorAlone

2.10 x 106 Ω

4.80 x 106 Ω

4.50 x 106 ΩFloorWax

9.40 x 105 Ω

1.40 x 106 Ω

1.50 x 106 Ω

Table 7
STAT-A-REST ESD Footwear
In-Use Voltage Generation Test Data @ 12% & 50% R.H. Conditions
Operator on ESD Floor - ANSI/ESD STM97.2

Report #: 2012-033

12% R.H.

50% R.H.

Mean + 3-sigma
Voltage

Mean + 3-sigma
Voltage

Floor
Alone-10 Volts-7.13 Volts

Wax
Floor-24 Volts-3.18 Volts

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Figure 1 - Walking Voltage Generation Data from Epoxy Floor with No Wax - 12% R.H.

Figure 2 - Walking Voltage Generation Data from Epoxy Floor with No Wax - 50% R.H.

Report #: 2012-033

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October 21st, 2012

Figure 3 - Walking Voltage Generation Data from Epoxy Floor with Wax - 12% R.H.

Figure 4 - Walking Voltage Generation Data from Epoxy Floor with Wax - 50% R.H.

Report #: 2012-033

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October 21st, 2012

EQUIPMENT USED FOR ELECTRICAL TESTING
Resistance Measurements:
Keithley Model 6517a Electrometer/High Resistance Meter
Prostat 801 Resistance Meter
5-lb Electrodes
Voltage Generation Measurements:
Prostat PGA710 Data analysis system
Prostat 711 Electrostatic Field meter

The results provided in this report are accurate within the limits appropriate to each test standard. The results of this report are statistically significant
only to the samples submitted for testing. MicroStat Laboratories/River’s Edge Technical Service, Inc. has no controls, and assumes no responsibility forthe tested product’s functionality or use. This report shall not be reproduced, except in full, without written permission from River’s Edge TechnicalService, Inc.

10/21/2012_______________
Date_______________________________
Carl E Newberg

Report #: 2012-033

MicroStat Laboratories / River’s Edge Technical Service
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