Why Containment Matters For Filling & Weighing for Highly Potent APIs

What Will You Learn From This Blog?

• Understand the importance of contained filling and weighing
• Consider how ergonomically designed equipment can support your pharmaceutical operations
• Explore how Hosokawa Micron Limited’s pharmaceutical expertise will support you

Every gram of active pharmaceutical ingredient (API) that moves through a filling or weighing line carries potential risks, such as harm to the operators who are present, and contamination of the product itself.

As drug formulations grow more potent, for example, cytotoxics and high-activity biologics, the room for error keeps shrinking. This is why made-to-measure contained filling and weighing equipment is essential.

We have outlined the key takeaways that ensure complete containment in filling and weighing for highly potent APIs, including OEB and cGMP regulations, product characteristics, and Hosokawa’s pharmaceutical expertise.

Why Containment Matters For Filling & Weighing

For filling and weighing processes, containment is essential to protect operators from hazardous exposure risks, comply with cGMP requirements, and preserve product integrity during transfer and packaging.

Hosokawa’s equipment predominantly supports the packing-off of API, in bulk, before it becomes incorporated into the finished products, i.e., tablets, capsules, etc. At this stage, accuracy tolerances are typically around +/-50g on a 20-25kg fill, precise enough for the receiving site to combine drums accurately, with the finished-product precision happening further down the supply chain.

Complete Containment: Protecting Operators

OEB Requirements & Operator Exposure Risks

Operational Exposure Bands (OEBs) are a key factor in selecting manufacturing equipment and designing processes that protect operators from hazardous material and highly potent API exposure. Rather than relying solely on PPE, OEB classifications help determine the level of engineering controls and containment required throughout production.

Why does this matter? Choosing the right pharmaceutical containment equipment that matches your processes’ OEB:

• Matches containment technology to potency correctly
• Prevents under-protection
• Avoids unnecessary over-engineering and wasting budgets
• Reduces risk of cross-contamination
• Improves long-term operator health outcomes

Hosokawa’s filling and weighing systems feature containment levels better than OEB 5 when they are partnered with Hosokawa’s containment equipment enclosing them.

Hazardous Area & cGMP Considerations

Hazardous area considerations, brought into focus as ATEX classifications, ensure that the risk of explosion from combustible dusts, gases, or flammable solvents is addressed.

For cGMP considerations, your containment equipment needs to meet product quality, contamination control, and data integrity to ensure that there is no compromise of the drug itself.

A high-OEB compound, or highly potent API handled in a flammable solvent, needs to have the right pharmaceutical containment equipment that is both ATEX-rated and contained to the OEB target, whilst cleanable and qualifiable.

This means that the design of your filling and weighing equipment must:

• Utilise appropriately rated, industry-compliant equipment.
• Ensure all metallic components are effectively grounded.
• Select surface materials and components that minimise the risk of friction-induced sparking or metal-on-metal contact.
• Incorporate adequate ventilation systems to mitigate airborne contamination risks.
• Engineer equipment specifically tailored to meet facility requirements.
• Ensure all individual components hold the necessary regulatory certifications.

How exactly does this impact pharmaceutical processes?

Proven In Practice, Made For Pharmaceutical Applications

Product Integrity & Quality

Product quality must be maintained throughout the entire manufacturing, filling, and weighing process, not just at the fill point.  This includes ensuring consistent process controls, equipment performance, environmental conditions, and pharmaceutical material integrity from raw materials through to final packaging.

Product Characteristics Drive Equipment Choice

Considering your pharmaceutical product characteristics will support your decision for made-to-measure pharmaceutical containment equipment. For example:

• Free-flowing products are easier to dose accurately, allowing for greater fill precision.
• Sticky or poorly flowing products are more difficult to dispense consistently, which can reduce fill accuracy.
• Low bulk densities mean “small” weights; they can still require large drums, such as 50/75/100 litres, meaning that manual handling is a real factor.

The selection of dosing equipment should consider both the product’s flow properties and the required cleaning regime.

Cleaning Regimes

The filling phase is just one component of contained filling and weighing operations, as potential risks remain throughout the entire process, particularly during cleaning. Meaning, your choice in pharmaceutical containment design must treat cleaning as a critical containment requirement.

Ensuring that containment is thoroughly integrated into all batches and every step of the workflow is the most effective strategy for eliminating cross-contamination, protecting operators, and maintaining validated product integrity.

Consider the cleaning design elements of your filling and weighing system, such as:

• Clean-in-place or wash-in-place system integration (CIP/WIP): CIP system integration cleans the equipment without operator exposure or disassembly, which is considered far safer than manual cleaning.
• Partial or full strip-down: Partial strip-down allows inspection of key areas to ensure cleaning regimes are fulfilling their brief, whereas it may be necessary to include a full strip-down of equipment, as every part and component needs to be inspected to ensure all areas are meticulously clean
• Manual strip-down and clean: For high-OEB compounds, and/or materials that are difficult to dose, remain sticky, adhere to parts, a manual clean is the only option to ensure full cleanability, but carried out in conjunction with the enclosing containment equipment, this ensures the operators are sufficiently protected during this process

Continuous Liner Fill & Weigh Systems

Further on in the process line for pharmaceutical manufacturing, there are secondary containment options that should be considered:

• Horizontal Laminar Flow Booth & Downflow Booths: Designed with stringent safety standards and industry regulations in mind, these containment booths minimise operator exposure to airborne contaminants while maintaining product integrity.
• Isolator & Gloveboxes: Designed for higher containment and strict hazardous areas, each of these products is designed for the growing need for safe, compliant handling of potent, hazardous, and toxic materials.

Hosokawa’s pharmaceutical equipment can be easily integrated into existing systems or supplied as part of a fully integrated process solution, because we understand that in pharmaceutical containment, it’s not one size fits all.

Pack-Off Options

When considering the pack-off options, you should keep in mind the levels of containment solutions you need, from high-containment to lower. For example:

High-containment solutions may include continuous liner systems, used with drums, kegs, or pails, proprietary high-containment flexible bags, and flexible intermediate bulk containers (FIBCs). These systems provide enclosed product transfer, minimise dust release, reduce operator exposure, and support contamination control throughout handling and packaging operations.

Lower-containment solutions, such as single liners, bags, and intermediate bulk containers (IBCs), are generally appropriate for materials with lower potency or lower dusting potential, where full containment is not required but protection of the product and handling efficiency remain important. These bulk finished products, such as CCMs and protein powders as examples, are generally lower OEB applications, but they can be packed off effectively utilising Hosokawa’s enclosures that surround the filling equipment.

Handling Filled Containers

As the process nears completion, ensuring the contained handling of filled containers is essential before proceeding to consumer packaging. Across our filling and weighing solutions, each provides:

• Manual or gravity fall roller tracks
• Powered roller tracks
• Manual lifters

Built For Longevity: Control Systems & Automation

Consider the levels of control systems and automation in your filling and weighing systems; for example, do you want HML-supplied control platforms, or have an automation strategy in place already?

Aspect	Description
Control Architecture / System integration	Systems may operate using an HML-supplied control platform or be fully integrated into the customer’s distributed control system (DCS), PLC/SCADA network, or site-wide automation platform, with HML supporting implementation and validation.
Automation Level / Strategy	The appropriate level of automation depends on process complexity, production volumes, and operational requirements.
Data Management & Key Drivers	Automated systems enable reliable process data capture, improve batch consistency by reducing operator variability, facilitate electronic records for regulatory compliance, and provide end-to-end traceability throughout manufacturing.

Download Your Made-To-Measure Buyer’s Checklist Today

Hosokawa’s pharmaceutical containment expertise helps you specify the right contained filling and weighing equipment that suits your application, whilst pharmaceutical containment is built around your operator, material, and site.

Discover what’s possible for your containment practices.

Download our Buyer’s Checklist, which contains all the latest insights into our pharmaceutical expertise, and a simple checklist supporting you in choosing the right supplier.

If you have any other questions, you can get in contact with our expert team.