Use of Bulk Bags in High Temp

Throughout various industries, flexible intermediate bulk containers (FIBC) have to be filled with materials that reach various temperature levels throughout their packaging and transport. It is important to understand the way high-temperature products affect bulk bags and their liners, so you know what to expect and how to safely follow the proper procedure to use these products.

Bulk Bags and Liners for High Temperature

FIBCs are designed with plastic material and polypropylene fabric woven together in individual strands to keep sensitive materials inside. It forms a strong, flexible, lightweight sack that can handle heavy materials with ease. Heat exposure, however, can cause the molecules in the fabric to loosen, particularly with temperatures above 70 F. When the temperature rises, the molecules move even more, decreasing the tensile strength of the fabric and ultimately weakening the bag. This change makes it easier for the material to stretch, rip or break.


Depending on the product inside, bulk bags with certain uses will require linings to make sure sensitive chemicals and fine powders can’t leak out during transport. It’s important to keep in mind that polyethylene liner material will start softening when it reaches temperatures from 195 F to 210 F. For this reason, we strongly recommend that you avoid filling polyethylene-lined bulk bags with products at temperatures above 170 F.


Another option, polypropylene high-temp liners, can increase filling temperatures all the way to 295 F. If your bag needs a liner and your products reach high temperatures, you should consider this type of liner.

Guidelines for High-Temperature Filling


Often, certain industries need to fill their FIBC with high-temperature materials to get products where they need to be and finish the job. In these situations, it’s important to understand proper safety guidelines to keep yourself, your workers and your materials safe from beginning to end.


  • Support any bulk bag containing a product at 100 F or higher from the bottom at all times. Do not lift it using any means other than foundational support. Wait until the fabric’s surface temperature has dropped under 100 F before using loops or any other parts on the bag for lifting and maneuvering.


  • If your company fills a bulk bag with a product that is over 200 F, it is crucial to test the bag after the heat exposure to make sure it still meets safety standards. You should altogether avoid filling an unlined bulk bag with materials at or above that temperature because they can significantly alter the bag’s tensile strength and safety.


  • Be sure to think about the peak temperature, amount of exposure time and level of material stress on the bulk bag before you determine its future performance and test its safety.


At Midwestern Bag & Supply, it is our No. 1 priority to make sure you get exactly the exceptional, high-quality bags and liners you need for the specific applications within your business, and that you stay safe using them. Complete a contact form online for more information about our bulk bags for high-temperature filling.

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2402 SE Creekview Drive, Suite 7, Ankeny, IA 50021