November 29, 2022 There have been reports of Hammer Dumbbells and Barbells showing signs of white dusting on the surface of the rubber.
Description of issue
It have been observed on some Hammer Strength Dumbbells and Barbells the surface of the rubber is showing signs of a white dusting (alternatively known as Dry Blooming). An example of dry blooming can be seen in Fig. 1.
Fig. 1
Description of Dry Blooming
Rubber Bloom is a common, superficial phenomenon that does not affect the functionality of rubber or its ability to seal. O-Rings, Rubber Gaskets, and Door Seals as well as Life Fitness Dumbbells and Barbells all can experience bloom and still maintain their material integrity and function. Bloom refers to formation of a dust or film on the surface of rubber compounds. The particulates that create bloom are recrystallized rubber compounds that are insoluble or unable to stay within the rubber as the material cools down to room temperature after vulcanization. Many rubber compounding materials have limited compatibility with the elastomer in use, which is why bloom is a common occurrence.
Cleaning & Maintenance procedure
Life Fitness only recommends approved cleaner are used, a list of approved cleaners can be found at the following link: Approved Cleaners
What can cause Blooming?
The following can be a factor of why Blooming may be observed. It is commonly caused by changes in heat, humidity, direct sunlight and long storage periods.
Will Blooming affect the rubber or life of the product?
While it may cause the rubber to look dirty or unattractive, Rubber Bloom is common and is not considered defective as it does not inhibit proper function of the rubber.
Can Blooming be removed?
Yes Blooming can be removed by regularly cleaning the heads of the Dumbbells / Barbells during the life of the product.
Are there any recommended cleaning products to remove blooming?
A Life Fitness list of approved cleaners can be found at this link Approved Cleaners