Skip to main content
QTA Systems Loudspeaker Parts
QTA Systems

DIY Loudspeaker Components

You are Here -- home -- loudspeaker components -- sorbothane isolation

Sorbothane Damping Isolators for Loudspeakers

Sorbothane Hemispheres for Damping Vibration

Sorbothane Hemispheres

   Sorbothane® is a relatively new, high-tech, synthetic material which has the ability to greatly reduce the transmission, (coupling) of vibration, between one / two vibrating objects. Transmission is the opposite of isolation, so the lower the transmission between items, the higher the isolation.

      It is used in a wide variety of applications which require isolation from shock and vibration. These applications include medical footwear, sports footwear, vibration damping of heavy machinery, isolation of delicate scientific instruments from noisy environments, top-end Hi-Fi equipment such as CD players, amplifiers and as loudspeaker mountings / feet.

      Technically, it is known as a visco-elastic polymer. Knowing what this means is not going to have much impact on your daily life, but . . . . . It's unique properties, those of performing somewhat like a solid and also as a liquid, make it a superb performer in the isolation stakes.

Article - Sorbothane, Overview and Usage - How to use Sorbothane Hemispheres

      NB: This product, particularly the smaller items, look much like sweets, so it is important that they are kept away from children.


Sorbothane Hemispheres for Loudspeaker Damping

* 30 Duro Sorbothane Hemispheres. NON-ADHESIVE. Sold in Packs /4.
Order Code Spec Wt Range 1+ 6+
11M30D 11mm 30 Duro Hemi (55 - 140) Gms /1 2.27 /4 2.16 /4
19M30D 19mm 30 Duro Hemi (170 - 420)Gms /1 3.70 /4 3.51 /4
30M30D 30mm 30 Duro Hemi (350 - 850)Gms /1 6.72 /4 6.38 /4
40M30D 40mm 30 Duro Hemi (0.65 - 1.55)Kgms /1 9.24 /4 8.78 /4
50M30D 50mm 30 Duro Hemi (1.2 - 2.7)Kgms /1 15.57 /4 14.79 /4


* 50 Duro Sorbothane Hemispheres. NON-ADHESIVE. Sold in Packs /4.
Order Code Spec Wt Range 1+ 6+
11M50D 11mm 50 Duro Hemi (260 - 500)Gms /1 2.27 /4 2.16 /4
19M50D 19mm 50 Duro Hemi (550 - 1250)Gms /1 3.70 /4 3.51 /4
30M50D 30mm 50 Duro Hemi (1.6 - 3.7)Kgms /1 7.59 /4 7.21 /4
40M50D 40mm 50 Duro Hemi (3.1 - 7.4)Kgms /1 10.44 /4 9.92 /4
50M50D 50mm 50 Duro Hemi (5.8 - 12.6)Kgms /1 15.57 /4 14.79 /4


* 70 Duro Sorbothane Hemispheres. NON-ADHESIVE. Sold in Packs /4.
Order Code Spec Wt Range 1+ 6+
11M70D 11mm 70 Duro Hemi (0.75 - 1.7)Kgms /1 2.27 /4 2.16 /4
19M70D 19mm 70 Duro Hemi (1.4 - 3.15)Kgms /1 3.70 /4 3.51 /4
30M70D 30mm 70 Duro Hemi (4.0 - 9.0)Kgms /1 6.72 /4 6.38 /4
40M70D 40mm 70 Duro Hemi (5.7 - 12.5)Kgms /1 9.24 /4 8.78 /4

Sorbothane Kits, Trial Sets of Sorbothane Hemispheres

   A selection of Sorbothane hemispheres of different sizes and hardness, giving the user the flexibility to trial different combinations / options of material characteristics at an attractive price. 4 pieces each of the listed specifications equals one kit. The suggested 'Weight Range' covers four 'like' Hemispheres, 'equally', statically loaded.

* Sorbothane Kits, NON-ADHESIVE. DIY Assorted Specs. Sold 4 per Type. 12 OR 16 Pcs / kit
Order Code Spec Wt Range /4 1 Kit
SORBKT1 4 each of (11M30D, 19M30D, 30M30D) (0.22 - 3.4)Kgms 11.41 /1
SORBKT2 4 each of (11M50D, 19M30D, 30M30D, 40M30D) (0.68 - 6.2)Kgms 21.92 /1
SORBKT3 4 each of (11M50D, 19M50D, 40M30D) (1.04 - 6.2)Kgms 15.20 /1
SORBKT4 4 each of (19M50D, 19M70D, 30M30D, 30M50D) (1.4 - 14.8)Kgms 18.75 /1
SORBKT5 4 each of (19M70D, 30M50D, 40M50D) (5.6 - 29.6)Kgms 17.68 /1
SORBKT6 4 each of (30M50D, 40M50D, 40M70D) (6.4 - 50)Kgms 22.68 /1

The use of adhesive tapes with Sorbothane

      Sorbothane is a difficult material to find adhesives which will effectively stick to its surface. By default the Hemispheres are supplied without adhesive backing. As most applications use the product in a trapped / compressive mode there is minimal use for adhesive backed types. However, If you wish to use an adhesive backed item we can now supply two types of adhesive tape, (in strips), which, you can cut and apply as required.

      The first tape is an adhesive transfer tape by 3M type 3M200MP. This "only" transfers the adhesive film which is extremely thin. It is rather difficult to separate it from the adhesive backer, so patience is required. It only sticks well to smooth surfaces and not so well to rougher surfaces.

      The second tape is a 0.8mm thick, double sided, white polyethylene foam tape, otherwise known as PE tape. The foam backer is of the closed cell variety. It has a rubber adhesive which sticks well to most surfaces. As the tape is "under" the Hemispheres the edge will be barely visible. This tape is also supplied in strips and is easy to cut / apply. Take note that the complete under surface of the hemisphere needs to be covered with the strip, NOT partial coverage. The larger Hemispheres (30, 40, 50)mm diameter require two strips to be edge butted together to give full coverage.

Adhesive Transfer Tape for Hemispheres

* Adhesive Tape 3M200MP: Sold in Strips
Order Code Spec: (W * L) Strip Size Price /pk 1+ Price /pk 6+
ATAPE1 Suits 11M**D (12.7 * 55) Strip £0.17 /1 £0.16 /1
BTAPE2 Suits 19M**D (19.0 * 90) Strip £0.38 /1 £0.36 /1
CTAPE3 Suits 30M**D (34 * 140) Strip £0.80 /1 £0.76 /1
DTAPE4 Suits 40M**D (44 * 176) Strip £1.60 /1 £1.52 /1
ETAPE5 Suits 50M**D (54 * 216) Strip £2.14 /1 £2.03 /1

Adhesive Foam Tape for Hemispheres

* Adhesive Foam Tape: Sold in Strips
Order Code Spec: (W * L) Strip Size Price /pk 1+ Price /pk 6+
FOMTAPE1 Suits 11M**D (25 * 75)x 1 Strip £0.27 /1 £0.26 /1
FOMTAPE2 Suits 19M**D (25 * 150) x 1 Strip £0.55 /1 £0.52 /1
FOMTAPE3 Suits 30M**D (25 * 150) x 2 Strip £1.09 /1 £1.04 /1
FOMTAPE4 Suits 40M**D (25 * 150) x 3 Strip £1.64 /1 £1.56 /1
FOMTAPE5 Suits 50M**D (25 * 150) x 4 Strip £2.19 /1 £2.08 /1

Adhesive Transfer Tape for Hemisphere KITS

* Adhesive Tape 3M200MP for SORBOTHANE Kits: Sold in Strips
Order Code Spec: (W * L) Strip Size Price /pk 1+ Price /pk 6+
FTAPE6 Suits SORBKT1 ( *****) Strip £1.32 /1 £1.26 /1
GTAPE7 Suits SORBKT2  (*****) Strip £2.94 /1 £2.79 /1
HTAPE8 Suits SORBKT3  (*****) Strip £2.14 /1 £2.03 /1
JTAPE9 Suits SORBKT4  (*****) Strip £2.35 /1 £2.23 /1
KTAPE10 Suits SORBKT5  (*****) Strip £2.77 /1 £2.63 /1
LTAPE11 Suits SORBKT6  (*****) Strip £3.99 /1 £3.79 /1

Telephone: +44 (0) 1223-891091 Email:- Sales, and Support to Contacts.  Mod (18), March 10, 2021 Copyright © 2008: