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Sorbothane Isolators


  • Isolate Vibrations Created from Equipment and Acoustic Sources
  • Useful for Uneven Surfaces

Sorbothane
Sheets

SB12A

 1/8" (3.2 mm) Thick

SB12B

SB12C

 1/4" (6.4 mm) Thick

 1/2" (12.7 mm) Thick

Application Idea

AV4 Sorbothane Feet Supporting an Aluminum Breadboard

AV4

1/4"-20 Tapped
Vibration Absorbing Feet

Related Items


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Features

  • Sorbothane® Provides Efficient Damping of Vibrations
  • Mounting Feet Ideal for use with Aluminum Breadboards
  • Sheets Ideal for Equipment or Other Items With Uneven Surfaces

Thorlabs’ Sorbothane Feet and Sheets offer excellent vibration and acoustic isolation for laboratory needs. Our Sorbothane feet offer internal 1/4"-20 (M6) threads or an adhesive surface, which can be used to attach the feet to the bases of test equipment or breadboards. For a more versatile option, Thorlabs also offers 12" × 12" (305 mm x 305 mm) Sorbothane sheets with 1/8" (3.2 mm), 1/4" (6.4 mm), or 1/2" (12.7 mm) thickness. These sheets are easily cut and can be adapted to suit a variety of custom applications.

For assistance in choosing the proper sorbothane isolator, please see the Feet Selection Guide and Sheet Cutting Guide tabs above.

Selecting the Proper Sorbothane Isolator Feet

The example presented here details the steps needed to ensure the proper selection of round sorbothane isolator feet to match the requirements of a particular load and problem frequency. Following the example are plots showing the amount of isolation achieved for our isolator feet. For specific isolation recommendations, please contact Tech Support.

Example

  • Mass of the Breadboard (mb): 44 lbs
  • Mass of Mounted Optics, Posts, Hardware, and Stages (me): 10 lbs
  • Number of Isolators (n): 4
  • Problem Frequency: Unknown

The round sorbothane feet's isolation graphs, shown below, use load per isolator (m) in lbs, which is given by the following equation:

Based on the values given above, the calculated load per isolator is 13.5 lbs. This value should then be looked up on each isolation graph for the round isolator feet below. Sorbothane feet with a calculated load per isolator that exceeds the maximum load are not suitable for the application. Without a known problem frequency, the isolator that effectively isolates at the lowest cut-on frequency is recommended.

For this example, the AV4(/M) or AV5(/M) sorbothane feet would both be acceptable solutions. The AV4 Ø27 mm isolator feet provide better isolation performance at lower frequencies but are near the load limit, so if the total load were higher than anticipated the isolator would be outside of the recommended load capacity. Our AV5 Ø38.1 mm isolator feet will have worse isolation performance at lower frequencies, but are well within the load range which may be preferable.

If a sorbothane sheet is preferred, it would need to be cut to an appropriate size as shown in the Sheet Cutting Guide tab. For a 13.5 lb (6.1 kg) load, a 0.5" (12.7 mm) thick sheet cut into 1.5" x 0.5" (38.1 mm x 12.7 mm) pieces would provide a good isolation solution.


Sorbothane Feet Isolation Plots

Sorbothane Feet Isolation
Click to Enlarge

The plot shown above shows the isolation efficiency per foot of the AV3 Sorbothane Isolator Feet. These isolators should not be used above the maximum load capacity of 6 lbs. Above this weight, the isolators will begin to amplify vibrations rather than damp them.
Sorbothane Feet Isolation
Click to Enlarge

The plot shown above shows the isolation efficiency per foot of the AV4(/M) Sorbothane Isolator Feet. These isolators should not be used above the maximum load capacity of 14 lbs. Above this weight, the isolators will begin to amplify vibrations rather than damp them.
Sorbothane Feet Isolation
Click to Enlarge

The plot shown above shows the isolation efficiency per foot of the AV5(/M) Sorbothane Isolator Feet. These isolators should not be used above the maximum load capacity of 33 lbs. Above this weight, the isolators will begin to amplify vibrations rather than damp them.
Sorbothane Feet Isolation
Click to Enlarge

The plot shown above shows the isolation efficiency per foot of the AV6(/M) Sorbothane Isolator Feet. These isolators should not be used above the maximum load capacity of 50 lbs. Above this weight, the isolators will begin to amplify vibrations rather than damp them.
KeyDescription
N/A Load too Large
>100 Hz Better Option is Available

Sorbothane Sheet Cutting Guides

The tables below show the different sizes that a Sorbothane sheet should be cut down to for isolating certain frequencies. Within each table are minimum frequency values, meaning that at a specific size and load the isolator will effectively damp any frequency equal to or greater than what is given. Orange cells indicate areas where the specific isolator size and load should not be used. N/A indicates that the load is too great, whereas >100 Hz indicates that a better option is available (i.e., to isolate a frequency of 150 Hz, an isolator size that is effective from 50 Hz and up is a better choice than one that is effective from 100 Hz and up). 

1/2" Thick Sorbothane Sheet Cutting Guide
Dimensions
Width 0.5" 1.0" 1.5" 2.0"
Length 0.5" 1.0" 1.5" 2.0" 2.5" 3.0" 3.5" 4.0" 4.5" 5.0" 1.0" 1.5" 2.0" 1.5" 2.0"

1/4" Thick Sorbothane Sheet Cutting Guide
Dimensions
Width 0.5" 1.0"
Length 0.5" 1.0" 1.5" 2.0" 2.5" 3.0" 1.0" 1.5"

1/8" Thick Sorbothane Sheet Cutting Guide
Dimensions
Width 0.5" 0.75"
Length 0.5" 0.75" 1.0" 1.25" 1.5" 0.75" 1.0"

Posted Comments:
rpicazof  (posted 2019-01-16 13:04:45.32)
Dear sir/ madam, My name is Román Picazo PhD student at the Helmholtz Institut Mainz in Mainz, Germany. I am not sure how to "read" the sorbothane Isolators sheets table for my application. I have a setup that weights ~40-50 kgs, and I would like to buy isolation sheets to protect against vibrations from the ground (I cannot use feet). My idea was to cut pieces and stick them to my breadbroad (600x900x50 mm), but I am not sure how many pieces, how large and where to put them, could you advice me on this? Thank you! PS: It would be extremely useful for the reader if the sheets table were in metric units as well.
bhallewell  (posted 2019-01-17 09:10:22.0)
Response from Ben at Thorlabs: Thank you for your feedback. I'd recommend taking a look at the "Feet Selection Guide" tab which can also be applied to this table. A breadboard of this size you could estimate to be around 70kg. If you were to cut 4 separate sheets under the breadboard, with one sheet in each corner, the distributed load would be ~17.5kg per isolator. You would then check across the list at the lowest frequency that can be isolated at this load per isolator. Based on this you would want to consider 1/2" thick Sorbothane sheets cut into 0.5" x 2" strips isolating from frequencies of 25Hz-30Hz upwards.
rms344  (posted 2017-04-06 13:31:45.487)
Is the AV6 available with threaded studs on both ends?
jlow  (posted 2017-04-17 11:29:59.0)
Response from Jeremy at Thorlabs: We can provide many custom solutions to the Sorbothane feet. We will contact you directly about this.
user  (posted 2017-01-19 15:03:24.987)
Is this material electrically conductive or is will it act as an insulator?
tfrisch  (posted 2017-01-20 11:31:46.0)
Hello, thank you for contacting Thorlabs. While we don't have any electrical specs for Sorbothane, it would behave as an insulator.
kri.tifr  (posted 2016-09-12 17:34:53.56)
Hi, I have a question regarding the sorbothane sheet cutting table. The length units are shown in inches. Should they be in ft instead? Thanks,...Raj
tcampbell  (posted 2016-09-13 09:01:04.0)
Response from Tim at Thorlabs: Thank you for your question. The sheet cutting guide tables are correct. They are meant to serve as a guide for cutting our 12" x 12" Sorbothane sheets down to smaller sizes.
lixue.wu  (posted 2016-08-17 14:49:06.337)
I cannot find Sheet Selection Guide for SB12B. That tab is not there. Thanks. Lixue
mjburek  (posted 2015-07-28 12:37:55.17)
Is it possible to have sheets which come in 18"x18" squares as well? We have many laser heads mounted on 12"18" and 18"x18" breadboards and would like to have a continuous vibration isolation sheet underneath.
msoulby  (posted 2015-07-29 10:21:38.0)
Response from Mike at Thorlabs: It is possible to use several of the standard SB12C sheets to tile the area that you need to cover. This would be more cost effective than having a custom one off size manufactured.

Sorbothane Feet

Vibration Isolation Feet
Click to Enlarge

Four AV4 Feet Supporting an MB12 Breadboard
  • Four Size Options Available for Benchtop Vibration Isolation
  • Available Mounting Options:
    • 1/4"-20 (M6) Tapped to Directly Attach to a Breadboard
    • Adhesive Mounting Surface to Directly Attach to Untapped Surfaces 
  • Supplied as Set of Four
  • Use Extra Feet to Increase Load Capacity

These Sorbothane mounting feet provide a passive isolation solution for workbench-mounted breadboards, effectively isolating noisy equipment from the optical table or breadboard surface. Unlike our pneumatic benchtop isolation solutions, these solid Sorbothane feet do not require inflation.

The AV4(/M), AV5(/M), and AV6(/M) mounting feet each contain internal 1/4"-20 (M6) threading and include four 1/4"-20 (M6) threaded studs. In contrast, the AV3 mounting feet are not threaded, and are attached to equipment or breadboards using the included double-sided tape. See the table below for the load capacities and dimensions of each isolator. When choosing an isolator, we recommend picking the isolator that offers the largest range of damped frequencies for the specific load being used. For further assistance in choosing the proper sorbothane isolator, please see the Feet Selection Guide tab above.

Please note that these feet may have silicon residue on their surface from the molding process. To remove the residue, wipe the feet down with an alcohol-based solvent such as isopropyl alcohol (IPA). To protect the work surface from this residue, please see our SB12E Adhesive Felt Sheets below.

Item # AV3 AV4(/M) AV5(/M) AV6(/M)
Load Rangea
(Per Foot)
3 to 6 lbs
(1.4 to 2.7 kg)
3 to 14 lbs
(1.4 to 6.4 kg)
3 to 33 lbs
(1.4 to 15.0 kg)
3 to 50 lbs
(1.4 to 22.7 kg)
Isolator Efficiency
(Click to View)
Hardnessb 70 Durometer 70 Durometer 70 Durometer 70 Durometer
Dimensions Ø0.71" x 1.00"
(Ø18.0 mm x 25.4 mm)
Ø1.06" x 1.00"
(Ø27.0 mm x 25.4 mm)
Ø1.50" x 1.00"
(Ø38.1 mm x 25.4 mm)
Ø1.77" x 1.00"
(Ø45.0 mm x 25.4 mm)
Mounting Double-Sided Tape Internal 1/4"-20 (M6) Threadsc Internal 1/4"-20 (M6) Threadsc Internal 1/4"-20 (M6) Threadsc
  • The load range for a set of four isolation feet will be the provided values multiplied by four.
  • Measured using the Shore "00" scale.
  • Includes Stud with External 1/4"-20 (M6) Threading
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
AV4 Support Documentation
AV4Ø27.0 mm Sorbothane Feet, Internal 1/4"-20 Mounting Thread, 4 Pieces
$24.35
Today
AV5 Support Documentation
AV5Ø38.1 mm Sorbothane Feet, Internal 1/4"-20 Mounting Thread, 4 Pieces
$28.95
Today
AV6 Support Documentation
AV6Ø45.0 mm Sorbothane Feet, Internal 1/4"-20 Mounting Thread, 4 Pieces
$33.28
Today
+1 Qty Docs Part Number - Universal Price Available
AV3 Support Documentation
AV3Ø18.0 mm Sorbothane Feet, Adhesive Mounting Surface, 4 Pieces
$19.91
Today
+1 Qty Docs Part Number - Metric Price Available
AV4/M Support Documentation
AV4/MØ27.0 mm Sorbothane Feet, Internal M6 Mounting Thread, 4 Pieces
$24.35
Today
AV5/M Support Documentation
AV5/MØ38.1 mm Sorbothane Feet, Internal M6 Mounting Thread, 4 Pieces
$28.95
Today
AV6/M Support Documentation
AV6/MØ45.0 mm Sorbothane Feet, Internal M6 Mounting Thread, 4 Pieces
$33.28
Today

Sorbothane Sheets

  • 12" x 12" (305 mm x 305 mm) Sheet Size with 1/8" (3.2 mm), 1/4" (6.4 mm), or 1/2" (12.7 mm) Thickness
  • Easy to Cut and Shape for Multiple Uses
  • Hardness: 70 Durometer (Measured Using the Shore "00" Scale)

These pliable Sorbothane Sheets are ideal for isolating mechanical noise or vibrations. The sheets come in three thicknesses and can be placed under a breadboard in single or stacked layers to counter the effects of uneven work surfaces or to isolate the breadboard from vibrations. For objects over 5 lbs (approx. 2.2 kg), the thicker 1/4" (SB12B) or 1/2" (SB12C) sheets are recommended. For information on the isolation efficiency of these sheets at specific load capacities, please see the Sheet Selection Guide tab above.

Sorbothane sheets can be cut to size using scissors or a utility knife. Please contact Technical Support to request Sorbothane sheets with a lower hardness.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SB12A Support Documentation
SB12ASorbothane Sheet, 12" x 12" x 1/8", Hardness 70 Durometer
$28.95
Today
SB12B Support Documentation
SB12BSorbothane Sheet, 12" x 12" x 1/4", Hardness 70 Durometer
$57.63
Today
SB12C Support Documentation
SB12CSorbothane Sheet, 12" x 12" x 1/2", Hardness 70 Durometer
$115.78
Today

Adhesive Sheets for Sorbothane Isolators

  • 12" x 12" (305 mm x 305 mm) Adhesive Sheets
    • SB12D: Two-Sided Adhesive Sheet for Semi-Permanent Setups
    • SB12E: One-Sided Adhesive Sheet with Felt Backing to Prevent Surface Marring from Sorbothane
  • Sheets Sized for Compatiblity with Sorbothane Sheets (Sold Above)
  • Can be Cut to Size for Use with Sorbothane Feet

These Adhesive Sheets are designed to be used with our Sorbothane mounting feet or sheets. The SB12D sheet, which has two adhesive surfaces, is ideal for semi-permanent applications where the sorbothane surface will not have to be moved often. Our SB12E sheet, which has one adhesive and one felt surface, prevents the sorbothane from marking or marring the table surface that they are placed on.

These sheets are sized to fit directly under our 12" x 12" (305 mm x 305 mm) sorbothane sheets, but can also be cut down to fit under our sorbothane mounting feet.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SB12D Support Documentation
SB12D12" x 12", Two-Sided Adhesive Sheet
$8.27
Today
SB12E Support Documentation
SB12E12" x 12", One-Sided Adhesive Felt Sheet
$8.27
Today
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