Mineral Oil Aromatic Hydrocarbons

Contamination Source

Identification of the pathways through which impurities enter the polymer matrix is essential for maintaining a clean production line. The primary source of mineral oil aromatic hydrocarbons is the use of recycled fibers in paperboard that comes into direct contact with food or plastic containers. During the recycling process, these oils from printing inks are not completely removed and can migrate into the food.

In the context of plastic moulding, the contamination can occur if the virgin resin is mixed with regrind that has been exposed to industrial oils. Some low-quality lubricants used in the moulding machine can also contribute to the level of these substances in the final part. Preventing this exposure requires strict control over the sourcing and the handling of all materials.

Barrier Efficiency

Protection of the food product from migrating contaminants depends on the effectiveness of the functional barrier provided by the plastic packaging. Many polymers, like polyethylene and polypropylene, are relatively permeable to mineral oil aromatic hydrocarbons and offer little resistance to their movement. To prevent migration, designers often use a multi-layer structure that includes a more resistant material such as ethylene vinyl alcohol or a specific grade of polyester.

The thickness and the density of these layers are calculated to ensure that the contaminants stay within the outer packaging for the duration of the shelf life. Testing the barrier performance is a standard part of the development process for high-safety packaging. A good barrier reduces the risk of chemical transfer and ensures the purity of the food.

Safety Assessment

Laboratory analysis of finished packaging is necessary to confirm that the levels of migrated substances remain below the safety thresholds. Measuring mineral oil aromatic hydrocarbons is a challenging task because they consist of thousands of different molecules that are difficult to separate and identify. Technicians use sophisticated chromatography techniques to isolate the aromatic fraction and quantify the total amount present.

The results of these tests are used to perform a toxicological assessment and determine if the material is suitable for its intended use. If the levels are too high, the manufacturer must reformulate the plastic or improve the barrier properties. This continuous monitoring is a requirement for meeting the high standards of the modern food industry.

The management of these contaminants supports the safety of the global food supply.