Posted by Dean on September 05, 2011 at 09:34:27 from (68.46.208.21):
In Reply to: good wiper blades???? posted by dave2 on September 05, 2011 at 09:17:18:
In one of my former lives, I was a warranty analysis engineer for GM. For a while part of my responsibility was wiper blades and arms. In this capacity, I worked closely with engineers from Delco, Anco, Trico, etc.
The best performing wiper blases that you will ever have are the ones that come on new cars (My experience is with GM but I assume that other manufacturers followed similar practice.) becaause the blades must satisy customer expections for the duration of the warranty (6 months for wiper blades).
OEM blades are made from natural rubber because natural rubber produces the best cleaning and anti streaking performance. The natural rubber is impregnated with wax (as are tires) to protect the rubber from oxygenation due mostly to ozone.
Natural rubber blades perform best but are not long lived due to the previously mentioned detioration, which occurs most frequently during extended periods of hot dry sunny weather. For best performance these blades should be changed every 6 months.
Few if any aftermarket blades (including service market blades sold by the OEMs) are made from natural rubber due to cost.
The black residue that you found on the rag is probably oxydized rubber from expensive natural rubber blades. Changing to less expensive blades, which will have wiping elements made of synthetic plastic, will likely result in longer lasting blades at the expense of somewhat reduced wiping and cleaning performance. Your wife will likely not notice the reduced performance but you will notice the longer life.
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