Standard liners are made out of polyethylene. A flexible and relatively lightweight plastic that is great for protecting food grade and pharmaceutical products from contamination.
There are some draw backs when it comes to using a standard liner for high temp products. Typically, a standard polyethylene liner will begin to melt at about 125°C. Similar to the woven polypropylene material the bag itself is made from, it will begin to soften and shift between 90°C and 100°C. Because of this, it is not recommended to put materials over 75°C in a bulk bag with a standard polyethylene liner.
As you approach the recommended temperature limit for a standard bag (90°C) you may find you have a need for a bag that can both withstand higher temperature exposure (greater than 90°C), and remain durable for re-use with high temp products. For these applications, we recommend a high temp polypropylene liner instead of a standard polyethylene liner.
Polypropylene liners are able to withstand significantly higher temperatures. These liners have a maximum filling temp of 145°C, substantially higher than both a standard flexible intermediate bulk container without a liner (95°C) and a bag with a standard polyethylene liner (75°C).
For higher temperature resistant, we provide PA based liners with temp withstanding capacity upto 180°C.