Flexible hoses for liquids suitable for food use
Flexible hoses suitable for the passage of food liquids such as: milk and dairy products, wine and spirits and derivatives.
Pipes suitable and certifiable according to ITALIAN, EUROPEAN AND AMERICAN REGULATIONS.
In WHITE NATURAL RUBBER, THERMOPLASTICS, POLYURETHANE, FLUORODERIVATIVES.
ATTENTION!
In the food and beverage sector, one of the most critical aspects to consider when choosing a tubing is undoubtedly the cleaning and sterilization process. This can be chemical ( CIP : cleaning-in-place) or thermal ( SIP : sterilization-in-place), i.e., through the use of steam.
In particular, with regards to CIP processes , the following are normally used:
- basic solutions (e.g. caustic soda) for the removal of fatty and protein particles;
- acidic solutions (e.g. phosphoric acid) for the removal of mineral deposits;
- oxidizing acids or other oxidizing products (nitric acid, peracetic acid, chlorine solution, hydrogen peroxide) for the removal of bacterial load.
The use of the SIP process aims to eliminate the bacterial load.
Tube selection & sterilization
Cleaning and sterilization operations are among the main factors responsible for the aging process of the materials present in the flexible hose structure, due to chemical attack and thermal stress, which lead to a progressive degradation of the physical and mechanical properties. For this reason, they become fundamental parameters to consider for a complete evaluation of the hose's suitability for a given application.
In fact, in most cases, the conveyed food product is less problematic than the cleaning process, which is chemically more aggressive and can significantly affect the life of the pipe in use.
It's common practice for companies working in the food industry to have defined and consolidated very specific cleaning and sterilization procedures that best suit their production systems. The purpose of this communication is solely to provide guidelines to help guide the selection of the most suitable polymer for the application.
Sterilization Technical Specifications
Below are the most common situations.
| Cleaning agent | Type of rubber | Concentration | Temperature |
| Hot water | EPDM, Butyl, NBR, Silicone, PFA, PTFE | Up to 95°C | |
| TPE | Up to 90°C | ||
| NR, NR/SBR, TPU | Up to 50°C | ||
| Steam | NR/SBR, NR | 100°C max 10' | |
| NBR, EPDM, Butyl | 130°C max 30' | ||
| SILICONE | 135°C max 30' | ||
| UPE | 100°C max 20' | ||
| PFA/PTFE | 130°C 30' | ||
| TPU | Not suitable | ||
| TPE | 120°C 10' | ||
| Caustic soda | NBR, NR, NR/SBR, Silicone, TPU | 1% | 80°C |
| EPDM, Butyl, TPE, UPE | 3% | 80°C | |
| PFA, PTFE | 3% | 80°C | |
| Nitric/phosphoric/peracetic acid | NR, NR/SBR, NBR, TPU | 1% | Only at Ta followed by washing with Ta water |
| EPDM, Butyl, TPE, Silicone, UPE | 1% | Ta | |
| 0.5% | 80°C | ||
| PFA/PTFE | 3% | 80°C | |
| Hydrochloric acid, hypochlorite | NR, NR/SBR, NBR, TPU | 200 ppm | Only at Ta followed by washing with Ta water |
| EPDM, Butyl, TPE, Silicone, UPE | 200 ppm | 80°C max 20' | |
| PFA/PTFE | 200 ppm | 80°C max 30' |
Further considerations
It should also be noted that the frequency of washing, increased variations in the percentage of chemical solution compared to those recommended, or an increase in the duration of the sanitization process can significantly reduce the life of the pipe.
For proper maintenance, we also recommend periodic inspections to verify the physical and mechanical condition of the pipe. For further information, please contact our technical office .
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