RS vs RX vs RB Vacuum Emulsifier: Which One for Your Batch Size

If you make cosmetic cream, pharmaceutical ointment or a thick emulsion, the vacuum emulsifier you choose will run for the next decade — so the right pick matters. Most buyers we work with end up comparing three series: RS, RX and RB. They all do the same job at a glance, but they are tuned for different batch sizes, viscosities and throughput goals. Choosing the wrong one usually means a machine that either under-utilises its vessel or never quite reaches the droplet size you need.

This guide walks through what each series is built for, where it shines, and where it falls short — so the machine you ask for a quote on is the one that actually matches your batch.

What all three series have in common

Every Ginhong vacuum emulsifier combines three working actions in one jacketed vessel: a slow anchor or scraper agitator that keeps product moving, a high-shear homogeniser that breaks droplets down, and a vacuum pump that pulls air out. The vessel is SS316L on product-contact parts, the jacket supports both heating and cooling, and every machine ships CE-certified. Where the series differ is in geometry, agitator speed and homogeniser power — and those differences decide what each one is good at.

RS series — small batches, fine emulsions

The RS series is sized for small to medium batches, typically 50 L to 500 L working capacity. The vessel is shorter relative to its diameter, which keeps the agitator reach short and the homogeniser head positioned right in the heart of the batch. That geometry is what gives the RS its reputation for exceptionally fine droplet size and tight, glossy emulsions.

• Best for: pilot batches, R&D scale-up, premium cosmetic creams, serums, pharmaceutical ointments, small-batch food sauces.
• Typical capacity: 50 L / 100 L / 200 L / 300 L / 500 L.
• Why pick it: if your final product is a stable, fine-particle emulsion and batch size is below 500 L, RS hits the spec without overkill.

The trade-off is throughput. An RS-500 makes a beautiful cream, but if your goal is two batches per shift of a 400 L product, you will feel the cycle time.

RX series — the workhorse for mid-to-large production

The RX series is the most versatile of the three and the workhorse of most cosmetics, pharma and food plants we supply. Working capacity runs from 100 L up to 2000 L, with a taller vessel and a more powerful homogeniser. The geometry and motor sizing let it handle higher viscosities and faster cycle times without losing droplet quality.

• Best for: full-scale cosmetic cream and lotion production, pharmaceutical semisolid manufacturing, mid-volume sauces and dressings.
• Typical capacity: 100 L / 200 L / 300 L / 500 L / 1000 L / 1500 L / 2000 L.
• Why pick it: if your batch is between 200 L and 1500 L and you need a balance of emulsion quality and throughput, RX is the default choice.

RX is also the easiest to scale up from RS. If your pilot is on RS-100 and you are heading toward 500 L production, the RX-500 uses the same control philosophy and similar tooling — operators transfer between them with minimal retraining.

RB series — high-throughput, large batches

The RB series is built for plants running very large batches — typically 500 L to 5000 L working capacity. Where RS and RX prioritise fine droplet size in a compact vessel, RB prioritises throughput: a more powerful homogeniser, a longer-cycle scraper agitator designed for very viscous products, and a vessel geometry that handles 100,000+ cP pastes without dead zones.

• Best for: high-volume cosmetic production (think 3+ tonne/day of cream), pharmaceutical ointments and gels at scale, hot-melt adhesives, pigment pastes.
• Typical capacity: 500 L / 1000 L / 2000 L / 3000 L / 4000 L / 5000 L.
• Why pick it: when your bottleneck is batch cycle time, not droplet refinement — and when you actually need 2000 L+ in one vessel.

RB is overkill for a 300 L boutique cream line. But for a 2000 L detergent plant running three shifts, an RS or RX would cap your throughput.

How to pick: a four-question filter

Run your project through these four questions and the answer usually picks itself:

1. What is your batch size in litres? Match to working capacity (typically 60–80% of vessel volume). 100 L batch → RS-200 or RX-200. 500 L batch → RX-500 or RB-1000. 2000 L batch → RB-2000+.
2. How thick is the product at the end of the cycle? Below ~10,000 cP, all three work. 10,000–50,000 cP: RX or RB. Above 50,000 cP (toothpaste-grade): RB only.
3. What is more important — droplet size or cycle time? Droplet refinement → RS or RX. Throughput → RB.
4. What utilities do you have? Steam or electric heating? Cooling water? Compressed air? Larger RB machines draw more heating/cooling flow, so check that your plant can supply it before locking in the size.

Scaling up: pilot to production

Most plants we work with start at pilot scale, then step up as demand grows. The good news is that the RS / RX / RB line is designed for that progression — and the right pilot machine is the one that lets you move up without re-engineering the process.

A common path looks like this:

1. R&D stage (5–50 L): benchtop mixers or a JX lab unit. Goal is to lock the formula — temperature, mixing time, order of addition, droplet size target.
2. Pilot (50–200 L): RS-100 or RS-200. Goal is to confirm the lab result scales linearly. Run three consecutive batches at the same settings; if viscosity and droplet size match the lab within 5%, the formulation is ready to scale.
3. Production (300–2000 L): RX-500 or RX-1000 is the typical first production machine. Geometry, homogeniser head design and control philosophy are close enough to RS that operators transfer without retraining.
4. High-volume (2000 L+): RB-2000 or larger when the daily tonnage justifies the cycle-time gain over RX at the same capacity.

The mistake to avoid is skipping the pilot step and going straight from lab to RB. RB vessels are unforgiving: a formulation that works at 100 L can stall at 2000 L because the heating/cooling ratio changes and dead zones appear behind the agitator. Pilot catches those issues before you have paid for a 2000 L machine.

Heating, cooling and utilities checklist

Vacuum emulsifiers are jacketed for a reason — most emulsions need to be heated to mix and cooled to fill. The bigger the vessel, the more utility flow it needs, and this is where many first-time buyers underestimate the plant-side requirements.

• Heating: confirm whether your plant has steam or whether you need electric heating elements. Steam gives faster heat-up but needs a boiler; electric is simpler but slower at scale. RX and RB machines are usually specified for one or the other at order time.
• Cooling: cooling water flow scales with vessel size. A 2000 L RB will typically need 8–12 m³/h of chilled water at 5–10 °C to cool a batch in under 60 minutes. If your chiller is undersized, the cycle will bottleneck.
• Compressed air: pneumatic valves (for vacuum, discharge, sampling) need clean dry air at 6 bar. Confirm your compressor can supply the peak demand when all valves actuate simultaneously.
• Vacuum pump: water-ring pumps are standard; dry pumps are an option for pharma or food plants where effluent is a concern. The pump size determines how fast the vessel can be evacuated to -0.09 MPa.
• Floor space and headroom: a 2000 L RB is roughly 2 m tall and 1.6 m wide, plus 1 m clearance for the control panel and 1.5 m for the lid to open. Measure the room before you order, not after.

Run this checklist against your plant utilities before locking in the size. A machine that has to run at 70% capacity because the chiller cannot keep up is more expensive than the right-sized machine that runs flat out.

Common mistakes when buyers compare the three

• Sizing to tank volume, not working capacity. A 500 L tank only delivers ~400 L of usable batch. Suppliers quote vessel size, not batch size — always confirm working capacity in writing.
• Assuming higher viscosity needs a bigger vessel. Often the opposite: a smaller RS with a properly matched homogeniser head handles viscous creams more uniformly than a stretched RB vessel.
• Skipping the pilot step. RS-100 or RX-200 pilot data saves a year of trial-and-error at production scale. Lock your formulation at pilot, then size up.
• Forgetting heating and cooling flow. RB vessels need significantly more jacket flow to cool the same mass per minute. A 2000 L RB on a 5-tonne chiller will bottleneck; a 500 L RX on the same chiller is fine.

The short version

RS is your pick for fine, small-batch emulsions where quality matters more than throughput. RX is the versatile default for most cosmetic, pharma and food plants between 100 L and 1500 L. RB is the throughput machine for very large batches or very high viscosities above 50,000 cP. Pick by working capacity and viscosity, not by series name — and always size to your real batch, not the vessel label on the quote.

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