3M 9920

Static Control Anti-Fatigue
Mat 9900 Series
3M™ Static Control Anti-Fatigue Mats enable workers
to stand comfortably for long periods while minimizing
the fatigue associated with standing work. Manufactured
from durable rubber, 3M Anti-Fatigue Mats consist of
a matrix of hollow cylinders that function like a spring
when compressed. These mats provide a durable cushion
that offers secure, stable footing and a unique energizing
At rest
Under impact
Their structure provides a stable surface supported by
rubber cells that soften in response to surface activity. These
cells provide the most effective cushioning solution because
the 3M Static Control Anti-Fatigue Mats get softer as
compressed, not harder like products made of foam.
Product Number
3M ID Number
3 ft. x 5 ft. (0.9 m x 1.5 m) Static Control Anti-Fatigue Mat
3 ft. x custom length Static Control Anti-Fatigue Runner
22 in. Octagonal Shape Static Control Anti-Fatigue Mat
One 3M™ Ground Cord 3040, 15 ft. (4.6 m) with 10 mm snap is included with each mat.
3M Static Control Anti-Fatigue Mats 9900 Series
Typical Value
Standard: 3 ft. x 5 ft. (0.9 m x 1.5 m) and Octagonal 22 in. (55.9 cm) diameter
Runners: 3 ft. width x custom length
0.625 inches (1.59 cm) with beveled edge
42 Shore A
2 lbs. per square foot
SBR Rubber Polymers
NFPA Rating (Scale 1 - 4) Fire: 1
Sweep, vacuum or damp mop
Solid molded rubber
Surface to Ground Snap
Surface to Ground
<1 x 106 Ω
<2 x 106 Ω (When connected through 3M™ Ground Cord 3040)
Coefficient of Friction
Greater than 1.0 C.O.F.
Temperature Use Range
-40°F to 180°F (-40°C to 82°C)
3 years limited warranty
Chemical Resistance
Water – Excellent
Acids – Fair-Good
Alkali – Fair
Alcohols – Good
Oil & Gasoline – Poor
Aliphatic Hydrocarbons – Poor
Aromatic Hydrocarbons – Poor
*Tested per ESD STMS7.1 at 72° F, 12% RH on 3 ft. x 5 ft. (0.9 m x 1.5 m) mat
Mats are easy to install and can be used at assembly and manufacturing workstations, warehouse and shipping areas, medical
laboratories and in field service.
Electrostatic Discharge (ESD) Testing Evaluation
Test Type
Typical Value
Resistance to Ground Point
2.1 x 104 to 2.6 x 104 Ohms
Resistance w/Person in Conductive Shoes
1 x 107 Ohms
ESD STM 97.2
Voltage w/ Person in Conductive Shoes
3 Volts - Grounded Mat
88 Volts - Ungrounded Mat
Note: Mats were tested by an independent ESD laboratory in accordance with ESD standards as indicated.
Essential Questions to Ask Before Buying an Anti-Fatigue Mat
Has the mat been optimized for softness
and hardness?
A standing surface that is too soft can increase fatigue
(eg, standing on a mattress). Overly soft surfaces also tend
to wear out more quickly. A surface that is too hard or
bottoms out easily may be only slightly better than standing
on nothing. 1, 2, 3, 4
3M™ Static Control Anti-Fatigue Mats 9900 Series are
engineered to very specific parameters that reflect the latest
research on optimal compressibility.
Does the mat provide an adequate balance
between instability and stability?
There needs to be enough instability to encourage small
postural changes that facilitate increased blood flow to and
from working muscles, but not so much that it requires
excessive muscular activity that might accelerate fatigue.
An extreme level of instability, caused by overly soft mats,
increases the risk of loss-of-balance as well as affects
overall body posture. Too much instability can increase
subtle additional muscular activity as the body works to
retain balance, accelerating fatigue levels. Fatigue-induced
deterioration in postural stability (balance) may lead to an
increased risk of slips, falls and workplace accidents when
workers are tired or experiencing discomfort.
Extreme levels of stability, on the other hand, are often
found in too-hard mats. Overly soft mats that bottom out,
or unusually hard mats, do not encourage subtle muscular
activity and increased blood flow to keep the muscles
optimally serviced with nutrients and waste removal.
Extremely stable mats may also create pressure points
causing discomfort and over-fatigue of certain muscles. The
optimal balance of instability and stability is critical and
works in concert with optimal compressibility. 2, 3, 4, 5, 6, 7
3M™ Static Control Anti-Fatigue Mats 9900 Series provide
a stable surface supported by unstable cells that ‘soften’ as
needed in response to surface activity.
Does the mat resist bottoming out without
being too soft?
Although a surface may have adequate compressibility, it
must also be appropriately thick. A mat that is too soft and
easily bottoms out begins to act like a mat that is too hard
because the cushioning material becomes fully compressed.
Current data suggests that mats should have a bottoming
out depth greater than 5 mm and a thickness greater than
10 mm. In other words, a mat may have an appropriate
ratio: thickness/bottoming out depth, but if it is too soft this
value becomes unimportant due to the overriding problems
associated with mats that are too soft. Optimal bottoming
out depth works in concert with an optimal balance of
stability and instability, and optimal compressibility. 1, 4
3M™ Static Control Anti-Fatigue Mats 9900 Series have
been optimized to resist bottoming out without being too
Does the mat adequately respond to worker
A responsive mat should rapidly return to its original
shape as weight is shifted. If a mat has a delayed rebound,
it will likely already be partially compressed as a load is
repeatedly placed on it, reducing its' ability to provide the
most effective benefit of its elastic modulus. A surface that
is slow to respond is prone to bottoming out.
Adequate responsiveness works in concert with optimal
bottoming out depth, optimal balance of stability and
instability, and optimal compressibility. 1, 2, 3
surfaces are constructed from foam materials. Regardless of
the variations in construction, from domed foam geometries
to draped top-covers with various surface textures, there
is one challenge shared by all foam-based mats: foam gets
harder as it is compressed.
So, if the objective is to provide a softer surface, why
do it with a material that gets harder as it is walked on
or stood on? On the other hand, some mats are made of
difficult to compress materials and lack the advantage of
compressibility provided by foam. 1, 3
3M™ Static Control Anti-Fatigue Mats 9900 Series get
softer as they are compressed, without bottoming out.
Does the mat resist movement under use?
A clean, dry floor is one of the best deterrents to a sliding
mat, but not always a likely reality. The material from
which a mat is made can also contribute to a mat that moves
easily across the floor. Some foam formulations break down
readily, creating a slippery layer of fine ‘dust’ between
the mat and the floor. If these mats are draped with a hard
finish, the user may be unaware of the degradation of the
material, as the top surface may still look good. Also, many
mats are so lightweight that they shift easily.
3M™ Static Control Anti-Fatigue Mats 9900 Series
technology has been designed to allow the movements of the
body, providing a helpful anti-fatigue characteristic.
Does the mat balance shock attenuation
(absorb energy) and resilience (return
The ability to attenuate or absorb shock without bottoming
out ensures that sudden movements on the mat are
cushioned adequately. Too much absorption may create
the same sensation as standing in sand, which may absorb
shock but is very uncomfortable as a working surface. When
balanced with the right amount of elasticity (resilience), a
mat can result in less discomfort. 2, 3, 8
3M™ Static Control Anti-Fatigue Mats 9900 Series provide
an optimum balance between shock attenuation and
Does the mat get softer as it is
There appears to be a popular yet faulty logic that reasons
if a hard surface is bad to stand on, then a soft surface is
good. In response to this erroneous assumption, many mat
3M™ Static Control Anti-Fatigue Mats 9900 Series are
significantly sturdier than lightweight mats and resist
movement yet are easily removed for cleaning.
Is the mat easy to clean?
Foam based mats, mats with rough, domed or uneven
surfaces, or mats with through-holes may be difficult to
clean, absorb moisture or trap foreign matter, which leads to
unsanitary and unsightly conditions.
damage because of thin edges or material softness.
Draped top-covers can curl and tear as they become brittle.
Mats with damaged edges create a trip hazard and should be
replaced. The edge system of a mat should be designed to be
durable so it is not easily damaged.
3M™ Static Control Anti-Fatigue Mats 9900 Series have
a surface that can easily be swept or air vacuumed. Mats
can be cleaned using a neutral cleaner following the simple
procedure outlined in the instruction manual.
3M™ Static Control Anti-Fatigue Mats 9900 Series have
been designed to last for many years; to resist edge damage,
tearing and premature failure of its elastic properties. The
mats come with a three year limited warranty.
Is the mat durable?
The real value of an anti-fatigue solution may be more
apparent when analyzing the number of replacement cycles
that result over a specified time period. Although it may not
be visible to the naked eye, the thin cell walls of foam mats
can rupture and lose their elasticity with use, leading to an
overly soft condition and a mat that easily bottoms out.
Summary of optimized mat qualities:
1.Optimized for just the right softness
2.Encourages blood flow in the lower legs
3.Resists bottoming out
4.Provides response to worker movements
5.Balances shock absorption and resilience
6.Gets softer as compressed
7.Resists warping, bunching, and creeping
8.Easy to clean surface
9.Durable structure and edges
Foam can break down, become ragged and generate
particulates over time. Also, mats may be prone to edge
The published research of the following scientists was considered in establishing the criteria for these questions:
1.Redfern, M.S. and Chaffin, D.B. (1995) Influence of Flooring on Standing Fatigue, Human Factors, 1995, 37(3) 570-581;
2.King, P.M. (2002) A Comparison of the Effects of Floor Mats and Shoe In-Soles on Standing Fatigue, Applied
Ergonomics 33: 477-484;
3.Cham, R. & Redfern, M.S. (2001) Effect of Flooring on Standing Comfort and Fatigue, Human Factors 43: 381-391;
4.Redfern, M.S. and Cham, R (2000) The Influence of Flooring on Standing Comfort and Fatigue, American Industrial
Hygiene Association Journal 61: 700-708;
5.Brantingham, C.R., Beckman, B.E., Moss, C.N. & Gordon, R.B. (1970) Enhanced Venous Pump Activity as a Result of
Standing on a Variable Terrain Floor, J. Occup. Med. 12(5): 164-169;
6.Krijnen, R.M., et al (1997) Compression Stockings and Rubber Floor Mats, J. Occup. Environ. Med. 39(9): 889-894;
7.Nussbaum, M.A. (2003) Postural Stability is Compromised by Fatiguing Overhead Work, AIHA Journal 64:56-61;
8.Sobel, E., Levitz, S.J., Caselli, M.A., Christos, P.J., and Rosenblum, J. (2001) The Effect of Customized Insoles on the
Reduction of Postwork Discomfort, Am. Podiatr. Med. Assoc. 91(10):515-520;
Important Notice
All statements, technical information, and recommendations related to 3M’s products are based on information believed to be
reliable, but the accuracy or completeness is not guaranteed. Before using this product, you must evaluate it and determine if
it is suitable for your intended application. You assume all risks and liability associated with such use. Any statements related
to the product which are not contained in 3M’s current publications, or any contrary statements contained on your purchase
order shall have no force or effect unless expressly agreed upon, in writing, by an authorized officer of 3M.
Limited Warranty
This product will be free from defects in material and manufacture for a period of three (3) years from the date of manufacture.
If this product is defective within the warranty period stated above, your exclusive remedy shall be, at 3M's option, to replace
or repair the 3M product or refund the purchase price of the defective product. 3M MAKES NO OTHER WARRANTIES
PARTICULAR PURPOSE. Except to the extent prohibited by law, 3M will not be liable for any loss or damage arising from
this 3M product, whether indirect, special, incidental, consequential or punitive regardless of the legal theory asserted.
The above warranty shall be void and of no further force and effect if the product has been abused, mistreated or neglected. The
warranty shall also be void if the product is damaged due to improper installation or as a result of the equipment or system with
which the product is used. Any unauthorized repair or modification to the product shall also void the above warranty.
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