Premature Ozone Cracking
Premature Ozone Cracking
(OP)
Making bias tires with a 60 natural 40 sbr N299 tread compound. 4.5 phr 6PPD and Wingstay combined. Two phr blended wax. 1 TMQ 2 sulfur 2 TBBS. Some tires are cracking horribly within 3 months of being mounted and only mounted on a rim, never used, loaded or flexed. Any ideas about what to look at? black dispersion? Too much cure?





RE: Premature Ozone Cracking
RE: Premature Ozone Cracking
RE: Premature Ozone Cracking
RE: Premature Ozone Cracking
RE: Premature Ozone Cracking
RE: Premature Ozone Cracking
RE: Premature Ozone Cracking
RE: Premature Ozone Cracking
Tires are stored outside next to competition. Competition tires are performing well.
Ozone - I have had several chemists and consultants view tire pieces. Consistently get, "Yes, that is ozone," when looking at the tires and "No way should that formula ever have an issue with ozone," when looking at the formula. Compounds are mixed 2-pass with AO protection, PPD, wax etc., in the first of two mixes so there should not be a problem with AO dispersion. My black dispersion was rated as OK to good from consultants. I have made mix cycle changes to improve it. Thanks for all your suggestions and comments.