4-D Welding and Fabricating 4-D Welding and Fabricating
  4D Welding and Fabricating 4D Welding and Fabricating
  4D Welding and Fabricating 4D Welding and Fabricating
4-D Welding and Fabricating 4-D Welding and Fabricating
4-D Welding and Fabricating

The Isolator

Along with the numerous industry standard products we produce, 4-D Welding & Fabricating also designs and manufactures its own specialty products such as the patented Isolator System:

The patented Isolator Vibration Dampening Mount

The Isolator is a patented vibration isolator mount designed to significantly reduce vibration caused by any engine or mobile machine in the heavy equipment and industrial industry. Examples of applications for The Isolator are Operator Protective Structure vibration dampening, large stationary engine applications such as gen-sets, compressors and pumps.

The advantage of The Isolator is that it is NOT a vulcanized or bonded system. It contains a removable and replaceable polyurethane bushing (same material used in the automotive suspension industry). The bushing is specifically manufactured for The Isolator mount. With The Isolator's patented system, there is no damage to the inner polyurethane bushing from welding during the installation because it is removed prior to welding fully in place. The steps are simple:
  1. Locate The Isliator where you want vibration dampening.
  2. Tack weld lower mount to machine or base frame.
  3. Tack weld upper shoe to structure.
  4. Separate mount and shoe with supplied bushing driver.
  5. Remove Polyurethane bushing and sleeve.
  6. Weld fully the mount and shoe.
  7. Let cool and then prep and paint.
  8. Re-install Polyurethane bushing and sleeve; then fit together mount and shoe.

Polyurethane Bushing Properties & Advantages


Polyurethane has substantially better impact resistance than structural plastics. All standard compounds of polyurethane exhibit good low temperature resistance and low brittle points.


In applications where severe wear is a problem, polyurethanes offer outstanding durability when compared with rubber or plastics.


Polyurethane resists cracking under repeated flexure. Once nicked or cut they show excellent resistance to cut-growth under repeated flex conditions. Unlike other elastomers, polyurethane can be utilized in very thin sections because of its exceptional strength and toughness.


Resilience in rubber is generally a function of hardness. This often undesirable relationship does not hold true with polyurethanes. Formulations are available in a wide range of resilience, from heavy shock-absorbing uses to high frequency vibrations or where quick recovery from deflection is required.


Polyurethanes remain flexible at very low temperatures; some as low as -80 Degrees F.


Products of polyurethane can be employed in numerous dry-heat applications-operating up to 200 Degrees F. Holding a typical compound at 250 Degrees F for one week causes only minor decreases in physical properties.

Technical Data & Mechanical Properties

Hardness, Durometer Value, ASTM D676-59T: 90A
Specific Gravity: 1.10
Tensile Strength, PSI ASTM D412-61T: 5000
Elongation at Break, % ASTM D412-61T: 450
100% Modulus, PSI ASTM D470:
Tear Strength Split, PLI ASTM D470: 95
Bayshore Rebound %: 42
Impact Resistance IZOD notched, ft. lb. /in. @ 75 Degrees F (ASTM D746-57T): Flexed
Bell Brittle Point Temp. Degrees F: Below -80
Compression Set %, Method B (ASTM D395): 30

4-D Welding and Fabricating
4D Welding and Fabricating
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