While most of the straps on my 3 masks bought aboutr 3 years ago have broken, the straps on two older masks are still doing well. The reason, kraton, and not vinyl.
Applications
Kraton polymers are always used in blends with various other ingredients like paraffinic oils, polyolefins, polystyrene, bitumen, tackifying resins, fillers to provide a very large range of end-use products ranging from hot melt adhesives to impact modified transparent polypropylene bins, from medical TPE compounds to modified bitumen roofing felts or from oil gel toys (including sex toys) to elastic attachments in diapers.
It can make asphalt flexible, which is necessary if the asphalt is to be used to coat a surface that is below grade or for highly demanding paving applications like F1 racing tracks.
Kraton based compounds are also used in non-slip knife handles. Color matched Kraton wheel opening extensions on 198088 AMC Eagles
The earliest commercial components using Kraton G (thermoplastic rubber) in the automobile industry were in 1975.[4] American Motors (AMC) used this polymer plastic on the AMC Eagle for the color matched flexible wheel arch flares that flowed into rocker panel extensions.[5]
Some grades of Kraton can also be dissolved into hydrocarbon oils to create "shear thinning" grease type products that are used in the manufacture of telecommunications cables containing optical fibres.