How to Ensure Packaging Materials for Chemicals Comply with REACH and CLP Legislation: A Guide for Manufacturers and Distributors

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Choosing the right packaging material for industrial chemicals is not just a matter of practicality, but primarily one of legislative compliance. The REACH and CLP regulations set clear requirements for the safety, compatibility, and labeling of packaging that comes into contact with chemical substances. Errors in this process can lead to product degradation, contamination, or even legal penalties. How should you proceed when selecting materials to ensure that packaging meets all standards while also protecting the quality of your products? This guide provides you with specific steps and recommendations to ensure full compliance.

Key REACH and CLP Requirements for Chemical Packaging Materials

The REACH legislation and CLP/GHS regulations form the key legal framework for the safe placing of chemical substances and mixtures on the market in the European Union. REACH focuses on the registration, evaluation, and authorization of chemical substances, while CLP governs their classification, labelling, and packaging. For manufacturers and distributors of chemicals, this means that packaging materials must meet not only technical requirements for protecting the contents but also legislative obligations related to safety and user information.

Packaging must be designed to prevent leakage of the chemical, withstand mechanical stress, and be compatible with the contents. According to CLP, mandatory safety elements must be displayed on the packaging: hazard pictograms, signal words ("Danger" or "Warning"), standard hazard statements (H-phrases), and safety handling instructions (P-phrases). This information must be legible, durable, and placed in a visible location. It is also important to ensure that the packaging material does not react with the contents, which could lead to degradation or contamination.

How to Verify the Compatibility of Packaging Materials with Chemicals

The compatibility of packaging materials with chemicals is a critical factor in ensuring product safety and stability. Before selecting packaging, compatibility tests must be conducted to verify whether the material can withstand the chemical effects of the contents. Standard test methods determine, for example, resistance to corrosion, permeability (penetration of substances through the packaging), or mechanical strength during long-term storage.

Common chemicals are often packaged in plastic containers (HDPE, PP, PET), glass, or metal, but the choice depends on the specific substance. For example, strong acids or alkalis require packaging made from materials with high chemical resistance, such as fluorinated polyethylene or stainless steel. For organic solvents, low permeability is key to prevent evaporation or degradation of the packaging. Manufacturers should collaborate with packaging suppliers who provide certified materials and technical documentation confirming their suitability for the given type of chemical.

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Safety Data Sheets (SDS) and Their Role in Packaging Documentation

The Safety Data Sheet (SDS) is an integral part of the documentation for chemical products and must be available to all participants in the supply chain. The SDS contains detailed information on the properties of the substance or mixture, including classification under CLP, instructions for safe handling, measures in case of spillage or fire, and data on compatibility with packaging materials. It is crucial for manufacturers and distributors that the information in the SDS corresponds to the actual properties of the product and is consistent with the labelling on the packaging.

In the case of packaging materials, the SDS must include recommendations for suitable types of packaging and warnings about potential risks associated with inappropriate packaging. For example, for flammable liquids, it is necessary to specify requirements for closures with ventilation or packaging resistant to static electricity. The SDS also serves as a basis for employee training and communication with regulatory authorities, so it is important to update it regularly in line with changes in legislation or product composition.

Certification and Additional Packaging Requirements for Chemicals

In addition to the basic requirements of REACH and CLP, packaging materials for chemicals may be subject to further certifications and standards that ensure their safety and quality. For example, packaging for the transport of dangerous goods must comply with ADR/RID/IMDG regulations, which govern the construction, labelling, and testing of packaging. These regulations require that packaging undergoes tests for resistance to drops, pressure, or vibrations, depending on the specific hazard class of the substance.

For certain applications, such as cosmetic or pharmaceutical products, additional certifications may be required, such as confirmation of the absence of heavy metals or suitability for contact with food (e.g., in accordance with EU regulations on materials intended for contact with food). Manufacturers should select packaging from suppliers who provide certificates of conformity and technical support to minimize the risk of non-compliance with legislation. It is also important to monitor updates to regulations, as packaging requirements may change based on new scientific findings or legislative amendments.

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Specific labelling requirements for packaging under the CLP Regulation

The CLP Regulation (Classification, Labelling and Packaging) sets out mandatory requirements for the labelling of packaging for chemical substances and mixtures, which manufacturers and distributors must comply with. A key element is the correct classification of the substance or mixture into harmonised hazard classes, which determine which pictograms, signal words ("Danger" or "Warning") and standard hazard statements (H-phrases) and safety instructions (P-phrases) must be displayed on the packaging. Pictograms must be black on a white background with a red border and have a minimum size of 1 cm² if the packaging volume exceeds 3 litres. For smaller packages, reduced versions may be used, but they must remain clearly legible.

The labelling must be durable, resistant to abrasion and chemical influences to prevent it from being rubbed off or degraded during transport and storage. For multi-component packaging (e.g. with an inner bag and outer drum), the labelling must be placed on the outer packaging, as well as on each individually sealed inner part if it contains a hazardous substance. It is also important to provide the supplier's identification details, including name, address and telephone number, to enable rapid contact with the responsible person if necessary.

Documentation and records proving packaging compliance with REACH and CLP

Demonstrating compliance of packaging materials with REACH and CLP requirements necessitates systematic documentation, which must be available not only for internal purposes but also for regulatory authorities. The foundation is the packaging manufacturer's technical documentation, which confirms that the materials used for packaging production do not contain substances prohibited or restricted by the REACH Regulation (e.g. certain phthalates, lead or cadmium). This documentation should include compatibility test results, certificates of conformity and declarations of compliance with applicable regulations.

It is also necessary to maintain records of which chemical substances or mixtures have been filled into specific types of packaging, including verification that the packaging material is suitable for the given substance. This includes records of resistance tests against chemical exposure, mechanical strength, and tightness. In the event of inspections, it is also required to present safety data sheets (SDS) for all substances and mixtures that have been distributed in packaging, including information on their classification and labelling according to CLP. These documents should be archived for at least 10 years from the last use of the packaging.

Practical Tips for Selecting and Testing Packaging Materials

When selecting packaging materials for chemicals, it is crucial to consider not only legislative requirements but also practical aspects such as resistance to temperature fluctuations, mechanical stress, and chemical aggressiveness. It is recommended to perform compatibility tests under real conditions, for example, by simulating long-term storage at various temperatures and humidity levels. For liquids, it is advisable to verify the packaging's resistance to permeation (penetration of substances through the packaging walls), which can lead to leakage or contamination.

For plastic packaging, it is important to check whether the material contains substances that could migrate into the contents (e.g., residual monomers or additives). For metal packaging, it is necessary to verify resistance to corrosion, especially if intended for aggressive acids or alkalis. In the case of paper or cardboard packaging, it is essential to ensure that they are treated against moisture and mechanical damage. Before putting the packaging into operation, it is advisable to consult its suitability with the chemical raw material supplier and, if necessary, conduct pilot testing with a small quantity of the substance.

Need to verify packaging compatibility with your chemicals?

GCG Group provides complete Safety Data Sheets (SDS) and technical documentation for every supplied raw material to help assess the suitability of packaging materials. Our experts will advise you on selection and legislative requirements so you can be sure your packaging complies with all regulations. Contact us – or browse our catalog of over 1,300 products right away.