Buying guide
7 min read
Selecting a vacuum for pharmaceutical powders
Pharmaceutical powder recovery is unusual in having two independent requirements that both have to be met by the same machine. The dust may be combustible, and the product almost certainly has a containment and cross-contamination requirement that is stricter than the safety case alone would set. Specifying for one and retrofitting the other rarely works.
- Combustible dust control and containment are separate requirements
- Potency drives the containment specification, not the fire case
- Cleanability and material of construction are part of the spec
- Cross-contamination policy usually decides dedication per line
Two requirements, one machine
Many pharmaceutical powders are combustible organic dusts — lactose, starch, microcrystalline cellulose, a wide range of actives and excipients. That puts them in Class II Group G and brings the ordinary combustible dust considerations: ignition sources, static, accumulation, area classification.
Independently, the product has a containment requirement. What leaves the machine matters as much as what it picks up, because an exhaust that passes the fine fraction is redistributing active material into the room. Absolute retained filtration is therefore an exposure control in this setting rather than a refinement.
Potency sets the containment level
The containment specification follows from the occupational exposure banding your organisation applies to the compound, not from the combustibility. A material with a low exposure limit may require a containment approach — bag-in bag-out change-out, sealed transfer, dedicated equipment — that a combustible-dust assessment alone would never have called for.
That is why the specification conversation should start with the compound's banding, and why a general-purpose industrial specification frequently turns out to be inadequate once the containment requirement is stated.
Cleanability is a specification item
Equipment in a pharmaceutical setting has to be cleanable to a documented standard, which puts material of construction, surface finish, weld quality and the absence of dead legs and ledges into the specification. Stainless steel construction with smooth internal surfaces is the baseline rather than an upgrade.
Change-out procedure belongs here too. Every filter change is a handling and exposure event, so how the filter is removed and bagged is part of the equipment decision rather than a downstream operational detail.
Cross-contamination and dedication
Shared equipment between products is a cross-contamination route, and in pharmaceutical manufacturing the consequence is a quality and regulatory one rather than merely a housekeeping one. Dedicated units or dedicated accessory sets per line, with a documented cleaning pass between products, is the usual arrangement.
The segregation policy should drive the equipment decision. Deciding how many units to buy after choosing the model tends to produce the wrong number.
Where the classification comes in
Whether an area is classified, and to what, is assigned by your own engineer as part of the facility's hazardous area assessment. Dispensing, granulation, blending and compression areas frequently are; packaging areas frequently are not.
Equipment is then matched to the classification that exists. A unit appropriate for a classified dispensary is not automatically what the packing hall needs, and specifying one machine for the whole site usually means over-specifying in one place and under-specifying in another.
Bring the banding and the classification
The two inputs that determine the specification are the occupational exposure banding for the compound and the area classification assigned by your engineer. With both, the model and configuration follow quickly.
Combustibility for a specific powder is established by testing it as your process produces it.
Frequently asked questions
- Are pharmaceutical powders combustible?
- Many are. Lactose, starch, microcrystalline cellulose and a wide range of actives and excipients behave as combustible dusts in Class II Group G. Severity for a specific powder is established by testing it as your process produces it.
- Does HEPA filtration satisfy the containment requirement?
- It addresses what leaves the machine, which is central. Whether it is sufficient depends on the exposure banding for the compound — higher-potency materials may require a containment approach covering transfer and change-out as well as filtration.
- Do we need a separate unit per product?
- Frequently, yes. Shared equipment is a cross-contamination route with quality and regulatory consequences, so dedicated units or accessory sets per line with a documented cleaning pass between products is the common arrangement.
- Is one specification enough for the whole site?
- Rarely. Dispensing and granulation areas are often classified where packing areas are not, so a single specification tends to over-specify in one place and under-specify in another. Match equipment to each area's classification.
Talk to the manufacturer
Get the right explosion proof vacuum for your application.
Tell us what you need to vacuum and where. Our technical team will recommend the PrestiVac model best suited to your material, your classification and how hard you will work it — and because we build every unit ourselves, we can modify it to fit.
- Legally certified explosion proof
- Solid stainless steel construction
- Industry-best 3-year warranty
- Designed & manufactured in the USA
- 200+ vacuum versions