Low bio persistence fibers behave very different in high temperature applications compared to Refractory Ceramic Fiber products. Low bio persistence fibers become brittle and loose flexibility, are more sensitive to pollutions, and once exceeding classification temperatures have very little safety margin arriving at full melt (no fiber).

Please keep in mind that a classification temperature is just the temperature at which the permanent linear shrinkage (PLC%) after 24 hour exposure is less than 4% (for bulk, blanket, paper and felt) and 2% (for board and VF products). In many applications the customer is after a durable fiber lining which is operating safely for years… not days. For this reason Vulcor among other manufacturers have defined a ‘maximum continuous use temperature’ for their products. Typically, this temperature is 150-200°C below the classification temperature. Is this exact science?? No… It is based on feedback from the market, test results and commonly accepted safety margins.

But before you are falling into boredom.. We have breaking news to share on our SoliWool ULS product range! 

Based on extensive testing at our own laboratory and the RWTH University in Aachen (Germany) we have upgraded the classification temperature of: SoliBulk™ ULS®, SoliBlanket™ ULS®, SoliPaper ULS®, SoliPaper™ Lowpac, SoliFelt™ ULS® and SoliBloc™ ULS® to 1260°C.

As a result of the different criteria for classification temperature (max. 2% PLC) we have decided to keep our SoliBoard™ ULS® at 1200°C.

Please click on the links of the products to see the details of our upgraded products.