HONG KONG – Consumers embracing the sustainable trend of “zero waste” using reusable silicone food containers and collapsible cups should exercise caution, according to a recent investigation by the Consumer Council (CC). The Council’s testing of 14 popular collapsible storage items revealed that a significant 60% of samples contained levels of Volatile Organic Compounds (VOCs) exceeding the safety standards set by Germany, raising potential health and safety concerns for frequent users.
The extensive product review, published in the latest issue of the CC’s CHOICE Magazine, examined 14 models—including foldable food boxes and cups—widely available on the local market. The tests aimed to assess not only the functional performance, such as resistance to food staining, but crucially, the release of potentially harmful chemical residues, particularly VOCs. Long-term, high-dose exposure to certain VOCs and siloxanes found in these products has been linked to potential adverse effects on human health, notably liver function.
Safety and Chemical Contaminant Findings
The core finding of the report highlighted that eight of the 14 tested silicone samples released VOCs at concentrations higher than the strict limit established by the German Federal Institute for Risk Assessment (BfR) recommendations. This chemical residue indicates incomplete curing or instability in the silicone material, which migrates into food or beverages, especially when exposed to heat.
Despite the widespread non-compliance, the Council identified five products that demonstrated rigorous safety performance, successfully meeting the demanding German specifications for low VOC release. These products earned high marks from the CC (four stars and above), offering consumers reliable and safer choices for their daily food storage needs.
Significantly, the report singled out IKEA for its strong performance across all tested criteria, reinforcing its trustworthiness within the space of essential kitchen and dining ware.
Functional Performance: The Fight Against Staining
Beyond chemical safety, the CC also evaluated the practical usability of the containers by testing their resistance to common, high-pigment foods. Silicone, known for its porosity, often absorbs strong colours from sauces, leading to stubborn stains that can be aesthetically unappealing and difficult to clean.
Food containers were exposed to curry and tomato sources, while cups were tested with grape juice and coffee. The results were mixed, though several products excelled:
- Two specific food box samples demonstrated exceptional resistance, showing no noticeable residue after thorough washing.
- Four collapsible cup samples also achieved a perfect five-star rating, remaining spotless after contact with staining liquids.
These findings allow environmentally conscious consumers to select products that not only support their “go green” goals but are also easy to maintain over time.
Consumer Advisory: Tips for Safe Silicone Use
To mitigate the risk of harmful chemical exposure, the Consumer Council and food safety experts advise consumers to take preemptive measures, particularly when using brand-new silicone products.
For first-time use, a simple yet crucial preparatory step can effectively reduce the level of residual VOCs:
- Initial Cleaning: Wash the container with warm water and mild detergent.
- Oil Coating: Once dry, lightly brush the interior surfaces of the container with a small amount of cooking oil. This process helps draw out excess compounds.
- Heat Treatment: Place the oiled container into a preheated oven at 200 degrees Celsius for approximately one hour. This controlled “curing” process evaporates residual VOCs and stabilizes the silicone structure.
This testing serves as a vital alert for Hong Kong residents committed to sustainable living. The CC encourages manufacturers to enhance quality control to ensure all products sold meet stringent international food-contact safety standards, protecting consumer health as the “plastic-free” movement continues to expand globally. Consumers are urged to consult the full report for detailed safety ratings before purchasing new reusable food containers.