PORTER GN. Front Loader 2 x to 12 x levels Stackable. Part no. JJP.P11400FN EPP Product description. The isothermal box Polibox®, made of polypropylene foam (PPE), is suitable to protect food against heat or cold due to the insulating properties of polymer foam, which has a high insulation value. Heat loss or gain is approximately 1 to 2 deg C. per hour depending on local conditions. Technical features. The polypropylene is expanded with CO2, without CFC and HCFC . The box has a closed-cell structure, which gives excellent structural strength. Shock and thermal resistance. Polypropylene foam has an excellent environmental balance and doesn’t cause environmental damage either due to production effect or as raw material:- - The box consists mainly of air (with regard to the density it can reach 98% air) and only 2% material. - The box is 100% recyclable and absorbs no energy in use . - The box is a stable plastic polymer of hydrogen and carbon - Operating temperature -40° + 120°C