Tire Curing Bladder Coatings

Several years ago Chem-Trend created the idea of protecting the curing bladder with a specially formulated coating to enhance its life. Today we have the largest range of these bladder treatments available to the tire industry.

Chem-Trend’s tire curing bladder treatments protect the working surface of the curing bladder against chemical and abrasion attack during its service life. Protecting the bladder against the high level of abrasion that occurs around the region of its surface that is in contact with the tire’s bead areas significantly improves its service life. The coatings also act as a barrier to help slow down the ingress of sulfur and other compounding ingredients from the hard chafer compound which lead to local hardening of the curing bladder. Providing a barrier to the ingress of these materials helps to further increase bladder life by reducing the tendency for this region of the bladder to crack in the vent lines – a typical cause of early bladder failure. Depending on the bladder type, the curing press type and the fit to the inside of the tires being cured, customers report increases in average bladder-life of up to 45% when using these coatings.

An additional benefit provided by some of the coatings available in Chem-Trend’s range of products is enhanced slip. This helps eliminate the start-up difficulties often associated with new bladders, and works to reduce defect levels throughout the life of the bladder.

Each product is designed to be applied to the curing bladder when it is new. Application to the bladder surface may be by spray gun, brush or wiping with a sponge. The coating is applied to the working surface of the bladder at room temperature. Depending on the grade selected, the coating is either left to cure at room temperature or is cured by baking the coated bladder in a hot air oven. After curing, using the recommended conditions, the coated bladder may be placed into service by fitting to the curing press and warming it up in the normal way. Each coating is applied only once to the surface of the bladder, using the techniques described earlier – there is no need to apply further applications.

These coatings provide protection to the curing bladders throughout their service life and they will help enhance slip to improve tire uniformity and reduce defects; however, they will not provide sufficient slip to ensure optimum tire uniformity and release throughout the life of the bladder. Therefore, they do not replace the need to treat the inside of the uncured tires with an inside tire paint, they are intended to be used in conjunction with established inside tire paints.

To learn more about how Chem-Trend can help you solve production challenges and improve the efficiency of your tire operations visit the appropriate pages below, or contact us directly to speak with one of our experienced tire industry specialists.

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Common Questions:

  • What is the difference between a bladder treatment and a "bladder start-up lubricant or coating"?

    A bladder treatment is a special coating that is applied to a new bladder before it is fitted into a press and once cured onto its surface is designed to last the life of the bladder; its function is to protect the bladder against chemical and abrasive attack during its service life, this leads to an increased bladder life.

    A bladder "start-up lubricant" is a coating that is applied to a new curing bladder prior to it being installed in a press to help provide additional slip to reduce slip related defects during the first few tires cured on it. Typically these "start-up lubricants" will survive on the surface of the bladder for a limited amount of cycles; however, they do not provide any protection against chemical and abrasive attack.

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