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MOSH & MOAH functional barrier coating TopBrane 551
TopBrane 551 is a water based barrier coating solution that offers excellent measurable MOSH & MOAH migration barrier properties.
Among producers and users of food packaging, there is growing concern about mineral oils present in, or migrating through, food packaging. Commonly referred to as MOSH & MOAH these substances are known to cause health risks if ingested. It can be easily absorbed by the human body and can be stored in several organs or in body fat. This can lead to accumulation and ultimately cause damage to the human body. Several MOAH compounds even have proven mutagenic and carcinogenic potential.
According to the Joint FOA/WHO Experts Committee on Food Additives (JECFA), the average daily intake (ADI) of MOSH, with a molecular weight of less than 480, should be less than 0,01 mg/kg body weight. When it comes to MOAH, any presence of these compounds in foodstuff is considered as unacceptable.
MOSH: Mineral Oil Saturated Hydrocarbons are chain and ring shaped. They have a high transfer rate into dry food with a large surface area and may accumulate and cause microgranulomas in various tissues including lymph nodes, spleen and liver (specially C16-C35).
MOAH: Mineral Oil Aromatic Hydrocarbons, predominantly alkylated polycyclic. They are considered mutagenic and carcinogenic.
MOSH and MOAH can migrate to packaged food during shelf life originating from volatile substances of industrial inks present in recycled paper or board used as primary packaging or in the outer packaging box.
The European Food Safety Authority stated in June 2012 that a significant source of MOH contamination in food is the use of recycled board as packaging material.
The German Federal Ministry of Food, Agriculture and Consumer Protection has presented two draft ordinances aiming at reducing the migration of mineral oil residues from recycled packaging for foodstuff.
The most recent draft for a so-called mineral oil ordinance of 24 July 2014 intends to limit the concentration of MOSH and MOAH in food contact materials that are made from recycled paper. According to this, they may only be used if they do not exceed the maximum levels of 24 mg of MOSH and 6 mg of MOAH per kg of paper, paperboard or cardboard. The carbon range for these concentrations for storing dry and non-greasy foods at room temperature or below is C16 to C25, and C16 to C35 in all other food contact materials.
The draft also specifies that food contact materials exceeding the stated maximum levels may still be used if the amount transferred to the food is maximum 2 mg of MOSH and maximum 0.5 mg of MOAH per kg of food. The producer of the food contact materials must in this case provide documents that explain how these requirements are met and prove that the respective food contact material contains a functional barrier.
Testing and analysis
The most appropriate technology to MOSH/ MOAH analysis is to use on-line coupled liquid chromatography-gas chromatography- flame ionization detection (LC-GC-FID). Until now, no standardized reference procedure verified with a proficiency test is available for the analysis of mineral oil components. Analysis is even more complicated by the presence of polyolefin oligomeric saturated hydrocarbons (POSH), as the analysis procedure cannot distinguish them from MOSH/MOAH compounds.
Basic analysis of transmission barrier performance is an accelerated comparative gravimetric test at 25°C and 50% RH, using n-heptane as a solvent migrating through the tested packaging samples.
TopBrane 551 MOSH & MOAH functional barrier coating
TopBrane 551 is a water based coating solution that offers excellent measurable MOSH & MOAH migration barrier properties. The combination of hyper platy structure of the pigments and the specific film forming characteristics of the binder composition present makes TopBrane 551 the perfect coating for a safe paper or board food packaging solution. A board treated with 5 to 8 g/m² TopBrane 551 coating can result in less than 100 g/m²/day migration of n-heptane, where the same board uncoated has over 2000 g/m²/day. Depending on the porosity or roughness of the base paper or board, the migration can be reduced by a factor of 20 to 50 with a TopBrane 551 barrier coating.
TopBrane 551 can be applied on standard coating systems and can be adapted to meet additional specific customer requirements, like adjustments for machinability and others.