Q. What sheath watt density do you build?
We warrant (with a bore nominal -0.000, +0.001") up to 160W per square inch. We will manufacture between 160W per square inch and 200W per square inch without warranty. Above 200W per square inch requires an engineering review for feasibility. In many cases a better fit required.
Q. Why do you use Stainless Steel 321 as opposed to Stainless Steel 316 which is more commonly used?
Stainless Steel 321 has been proven to be more resistant to corrosion and oxidation. All things being equal, a Stainless Steel 321 heater should be easier to remove. This is just one of the premium materials that are standard with a Nexthermal heater.
Q. What can be done to prolong the service life of a cartridge heater?
Cartridge heaters generally fail due to fit, moisture, contamination and movement. Lower temperature heaters (below 500 degrees F) have a range of options to impede moisture, contamination and lead failure due to movement. The best thing you can do is discuss your specific application with a Nexthermal Sales Engineer. Providing examples of failed heaters will also help us identify the root cause specific to your application.
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