Review Details

1.5" Dia Sorbothane Hemisphere Rubber Bumper Non-Skid Feet with Adhesive

1.5" Dia Sorbothane Hemisphere Rubber Bumper Non-Skid Feet with Adhesive

Product Review (submitted on January 26, 2016):
இ ԲμⓏʐᎽ ധƱ௨Ẕყ Rating:
ѾѾѾѾѾ Highly recommended with warm fuzzies!

The 50-durometer hardness rating of this product is halfway in firmness between the softer 30-durometer Sorbothane bumpers and the firmer 70-durometer Sorbothane bumpers. Sorbothane is a synthetic viscoelastic urethane polymer with excellent shock-absorbing and vibration-dampening properties.

I have two 17-inch laptops and their fan intake vents are located underneath the laptop. The fan intake vents pull air in from underneath the laptop and the warm air from the interior of the laptop is blown out through vents on one side of the laptops. The laptops can get quite warm when there is a lot of extensive CPU or disk activity going on. To improve air circulation underneath the laptop and improve the efficiency of the bottom fan intake vents, I attached two of these 1.5"-diameter vibration-absorbing rubber bumpers near the rear corners of both laptops. But I also wanted these bumpers to be removable so that the laptops could still fit inside laptop case and sleeves; otherwise, the bumpers' .75" height can prevent the laptop from easily sliding into the case or sleeve. So I used sheet metal shears and cut out circles from an old software CD that I no longer needed. I cut out these circles of plastic so that they were slightly larger than the 1.5" diameter of these bumpers. I sanded the edges of these plastic circles to smooth them out. I then attached these adhesive-backed Sorbothane bumpers to the plastic circles that I cut out from the CD. Next, I cut a small square of adhesive-backed "Industrial Strength Velcro Tape", stuck the fuzzy "loop" Velcro side onto the plastic circle that these rubber bumpers are mounted on, and stuck the "hook" Velcro side underneath each laptop near the two rear corners. I carefully attached the "hook" Velcro side on the underside of the laptops near their rear corners so that they were equidistant from the rear (so the laptop would evenly slope forward), and I also positioned the Velcro so that they did not block any screws or removable panels such as the battery compartment or hard drive compartment. This is the perfect size to use as riser pads to lift the rear of a laptop up by .75". And now I have converted these adhesive-backed rubber bumpers to be removable riser pads that attach to the rear of my laptops using Velcro.

The surface of these Sorbothane hemispheres feels sticky and tacky. These bumpers contain a plasticizer that can possibly leach and discolor wood. If you are placing these on wood flooring or furniture, you should insert a small piece of plastic wrap between these bumpers and the wood surface to both prevent the possibility of the plasticizer leaching onto the wood and to also prevent these tacky bumpers from sticking too tightly to the surface that they are sitting on. This is especially true for applications where you need to periodically lift these bumpers off a surface, such as my use of these bumpers as riser pads underneath my laptops. Just leaving my laptop on a desk for one day caused these bumpers to stick onto my desk surface like half-dried chewing gum. And even though each bumper has a backing of 3M adhesive, when you lift the object that is using these bumpers off of the floor, table, or shelf, the bumpers may be sticking so firmly to the surface that they can cause the bumpers' adhesive backing to pull away from the object that you originally stuck them onto. The tacky surface of these bumpers easily picks up dust, lint, and other debris, which can be an issue if a hard piece of debris is stuck onto the bottom of a bumper and it ends up scratching your wood furniture or floor. To solve this sticky issue, I thoroughly cleaned the entire surface of the bumpers and then wrapped the bottom of each bumper with a 1"x1" square of plastic wrap (cling film used to wrap food and food containers). The plastic wrap sticks very well to the bottom of these bumpers and they are no longer prone to sticking or leaching onto any surface without reducing the bumpers' vibration-dampening attributes. Some uses of these bumpers require that an object be firmly mounted to a surface without any possibility of shifting, and that object will rarely or never be moved. But for most applications such as using these underneath speakers, turntables, laptops, etc, I recommend wrapping these bumpers with a layer of plastic wrap if you do not require these bumpers to stick very firmly to the surface, and this will prevent the possibility of plasticizer leaching out, difficulty in lifting the bumpers from the surface, and debris sticking onto the tacky surface that may scratch wooden surfaces.

The surface of these Sorbothane hemispheres feels sticky and tacky. These bumpers contain a plasticizer that can possibly leach and discolor wood. If you are placing these on wood flooring or furniture, you should insert a small piece of plastic wrap between these bumpers and the wood surface to both prevent the possibility of the plasticizer leaching onto the wood and to also prevent these tacky bumpers from sticking too tightly to the surface that they are sitting on. This is especially true for applications where you need to periodically lift these bumpers off a surface, such as if you need to sometimes move the speakers or subwoofer that are using these bumper feet. Leaving these bumpers pressed onto a surface for a long period of time can cause them to stick onto the surface like half-dried chewing gum. And even though each bumper has a backing of 3M adhesive, when you lift the object that is using these bumpers off of the floor, table, or shelf, the bumpers may be sticking so firmly to the surface that they can cause the bumpers' adhesive backing to pull away from the object that you originally stuck them onto. The tacky surface of these bumpers easily picks up dust, lint, and other debris, which can be an issue if a hard piece of debris is stuck onto the bottom of a bumper and it ends up scratching your wood furniture or floor. To solve this sticky issue, I thoroughly cleaned the entire surface of the bumpers and then wrapped the bottom of each bumper with a 1.5"x1.5" square of plastic wrap (cling film used to wrap food and food containers). The plastic wrap sticks very well to the bottom of these bumpers and they are no longer prone to sticking or leaching onto any surface without reducing the bumpers' vibration-dampening attributes. Some uses of these bumpers require that an object be firmly mounted to a surface without any possibility of shifting, and that object will rarely or never be moved (e.g. sensitive laboratory equipment mounted on metal shelves or Formica countertops). But for most applications such as using these underneath speakers, turntables, laptops, etc, I recommend wrapping these bumpers with a layer of plastic wrap if you do not require these bumpers to stick very firmly to the surface, and this will prevent the possibility of plasticizer leaching out, difficulty in lifting the bumpers from the surface, and debris sticking onto the tacky surface that may scratch wooden surfaces.

These Sorbothane bumpers are expensive, but they are a lot more effective at reducing vibration than generic stick-on rubber bumper feet. The Isolate-It! company does sell versions of these bumpers with a urethane coating that prevents plasticizer leaching and are also not as sticky. But at the present time, the urethane-coated bumpers are not being sold on Amazon and they are really expensive if you buy them directly from the manufacturer. Wrapping these bumpers in a layer of plastic wrap works just as well :)