Vertical Planetary Batch Mixer
Safe, Efficient, and Reliable High-Viscosity Mixing
When it comes to mixing high-viscosity materials — from propellants, explosives, and pyrotechnics to silicones, adhesives, and specialty chemicals — the B&P Littleford Vertical Planetary Mixer can't be beaten. This is our primary system for mixing energetics safely and effectively worldwide, and it's backed by hundreds of long-term customers for good reason.
Unlike a standard single-shaft planetary mixer, B&P Littleford's dual planetary mixer design has provided unparalleled effectiveness with unsurpassed safety — not to mention the kind of reliability that makes for well-satisfied customers across a variety of industries. With more than 100 years of mixing expertise and an energetics heritage few manufacturers can match, every Vertical Planetary Mixer we build is engineered to the exacting safety and reliability standards required for the industry's most demanding applications.
Vertical Planetary Mixer Design Features
The Vertical Planetary Mixer from B&P Littleford has a unique design with off-center mounting of the mixing blades. This ensures the mixture is uniform and homogenous, with no hot spots or dead spots throughout.
Dual Planetary Blade Design
Dual planetary blades follow a precise orbit around the center of the machine, eliminating the "dead spot" typically found beneath blade centers in conventional single-shaft designs. The result is more thorough, more consistent mixing across the entire batch.
Patented "Hunting Tooth" Technology
Our patented hunting tooth feature offsets the blade path slightly with each full rotation, which further enhances mixing efficiency while reducing bowl wall film — the blades tend to fully wipe the bowl bottom and wall as they rotate. Less product clinging to the vessel means faster changeovers and less waste between batches.
Robust Drive Train Engineering
Gears, bearings, shafts, and other drive train components are engineered for robust horsepower requirements, so the mixer can handle the ample power demands of very high-viscosity mixes without sacrificing long-term reliability.
Built to Last
B&P Littleford dual planetary mixers offer exceptionally long service life, minimal cleaning
time, and consistent batch quality. Uniform operating characteristics and a wide selection of
working capacities facilitate the transition from laboratory development to full-scale production operations.
The High-Viscosity Mixing Solution You Need
The Vertical Planetary Mixer is engineered for processors who require precision, safety, and
scale. It's ideal for operations that demand:
- More efficient, homogeneous mixing with no hot spots or dead zones
- Reduced bowl wall film for cleaner batches and faster changeovers
- Safe, reliable handling of energetics materials — including propellants, explosives, and pyrotechnics
- Ample horsepower to process very high-viscosity mixes
- Uniform performance from lab-scale development (as small as 50 mL) up through full production (as large as 1,800 gallons)
- Flexibility across a wide range of materials, including silicones, adhesives, and specialty chemicals
How The Vertical Planetary Mixer Works
The Vertical Planetary Mixer operates on a dual-blade orbital principle inside a vertical mixing bowl. As the two planetary blades trace their orbit around the center of the vessel, the hunting tooth mechanism nudges that orbit path slightly with every rotation — so the blades never retrace the exact same track twice in a row. Over the course of a batch, this eliminates the "dead zones" that plague fixed-path mixers, keeps material moving off the bowl wall, and drives the uniform, homogeneous result high-viscosity and energetics processors require.
The Regal Model: Purpose-Built for Solid Rocket Propellants
One of the most exciting applications of the Vertical Planetary Mixer platform is the Regal — our largest mixer, purpose-built for solid rocket propellants and explosives, weighing over 160,000 pounds.
- 1,800-gallon working capacity (2,800-gallon total capacity) — without peer in the complete uniformity of solid propellant mixes
- Three agitators — one fixed in the center, and two that rotate around it
- Creates a complex mixing action that combines shear, kneading, stretching, pumping, and plowing
Whether your needs are mixing rocket fuel or any other energetics component with the most precise requirements for precision and safety, the team at B&P Littleford can design the equipment and systems to set you up for success.
Prove Your Process: The B&P Littleford Technology Center
Choosing a new mixing technology is a critical decision. We invite you to eliminate the guesswork and prove your results before you invest. Located in Saginaw, Michigan, our 16,000-square-foot facility is one of the most comprehensive process laboratories in the United States.
- Confidential Evaluations: Our staff of experienced engineers and technicians handle dozens of confidential product evaluations every year.
- Empirical Analysis: Conduct a test run on the Vertical Planetary Mixer to calculate precise performance metrics for your specific materials and formulations.
- Scale-Up Confidence: The data operating parameters of your formulation are used to scale to the size needed for your full production requirements.
- Batch Consistency Verification: Run repeated batch cycles on our lab- and pilot-scale units to confirm repeatability and homogeneity before committing to full-scale production.
INFRINGEMENT NOTICE: B&P Littleford is the owner of copyrights in drawings for the Baker-Perkins Dual Planetary Vertical Explosive Mixer. Read the full infringement clause here.
B&P Littleford offers the Vertical Planetary Mixer across a full range of sizes to match your output requirements, from lab-scale product development to maximum-throughput production.
- Lab & R&D Scale (Micro, 1, 2): 50 mL – 1.6 pint working capacity. Ideal for formulation development, small-batch validation, and confidential product evaluations.
- Pilot & Small-Batch Production (Models 3, 4, 6, 8): 0.5 – 7.5 gallon working capacity. Suited for scale-up trials and low-volume specialty production.
- Mid-Range Production (Models 11‑1/2, 12‑1/2, 14): 15 – 75 gallon working capacity. Built for growing production programs that have outgrown pilot equipment.
- Full-Scale Production (Models 16, 18): 150 – 600 gallon working capacity. Maximum-throughput batch mixing for the most demanding production environments.
- The Regal — Our Largest Mixer: 1,800-gallon working capacity, purpose-built for solid rocket propellants and explosives.
Standard Machine Specifications:
- Working capacities from 50 mL to 1,800 gallons (up to 2,800-gallon total capacity)
- Dual planetary blade design with patented hunting tooth technology
- Engineered for energetics, high-viscosity, and shear-sensitive materials
- Robust gear, bearing, and shaft components sized for high-horsepower operation
The B&P Littleford Vertical Planetary Mixer is well-proven across a broad range of industries and high-viscosity, safety-critical mixing applications:
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Industry |
Sample Products |
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Energetics & Defense |
Solid rocket propellants, explosives, pyrotechnics, igniter compositions, propellant binders |
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Adhesives & Sealants |
High-viscosity adhesives, silicone sealants, structural bonding compounds, potting compounds |
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Specialty Chemicals |
Silicones, putties, greases, high-solids coatings, viscous polymer compounds |
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Aerospace & Defense Manufacturing |
Composite propellant grains, specialty bonding agents, thermal protection compounds |
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Industrial & Consumer Products |
High-viscosity pastes, gasket and caulking compounds, specialty resins |
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Don't see your application listed? The Vertical Planetary Mixer's fully custom engineering
approach means B&P Littleford can evaluate nearly any high-viscosity or energetics material —
Request A Quote to discuss your specific formulation.
B&P Littleford builds every Vertical Planetary Mixer to your process and safety requirements:
- Explosion-proof motors and controls (UL, CE, and ATEX compliant) for energetics and hazardous material handling
- Remote or blast-shielded operation configurations for high-risk propellant and explosives mixing
- ASME jacketed bowls for precise heating and cooling control
- Variable speed drives for fine-tuned mixing energy and shear control
- Full vacuum operation for de-airing and moisture-sensitive formulations
- Total stainless steel construction with required polish for sanitary or corrosion-resistant applications
- Computerized controls with recipe management and batch data logging
- Tilt, valve, or bottom-discharge configurations to match downstream handling needs
- Spray injection systems for controlled liquid addition during mixing
B&P Littleford is prepared and equipped to help you find the right Vertical Planetary Mixer solution for your high-viscosity or energetics batch mixing needs. The Vertical Planetary Mixer has a proven track record processing propellants, explosives, silicones, and specialty adhesives across defense, aerospace, and industrial applications — and we invite you to see what it can do for yours.
Whether you're scaling a formulation from lab development to full production, replacing aging or underperforming mixing equipment, or designing a new energetics processing line from the ground up, we're ready to prove the performance of the Vertical Planetary Mixer with your specific materials.
Take advantage of our energetics heritage, our decades of mixing expertise, and our proven technology by contacting us to discuss your process requirements.
Let's Connect!Frequently Asked Questions About Vertical Planetary Mixers
What is a vertical planetary mixer?
A vertical planetary mixer is a batch mixer that uses one or more blades orbiting around a vertical mixing bowl — similar to the motion of a planet orbiting a sun — to achieve thorough, homogeneous mixing of high-viscosity materials. B&P Littleford's design uses dual planetary blades with a patented hunting tooth feature to eliminate dead spots and reduce bowl wall film.
How does a dual planetary mixer differ from a single-shaft mixer?
A single-shaft mixer typically leaves a "dead spot" beneath the blade center where material isn't effectively worked. B&P Littleford's dual planetary mixer uses two blades on a precise orbital path around the center of the machine, eliminating that dead spot and delivering more uniform, homogeneous batches.
What is the "hunting tooth" feature and why does it matter?
The hunting tooth feature is a patented design that offsets the blade orbit path slightly with every full rotation. Instead of repeatedly tracing the same path, the blades gradually cover the entire bowl bottom and wall, reducing bowl wall film build-up and improving overall mixing efficiency.
What materials can the Vertical Planetary Mixer process?
The Vertical Planetary Mixer is engineered for high-viscosity batches, including propellants, explosives, pyrotechnics, silicones, adhesives, and other specialty and energetics materials that require safe, precise, and consistent mixing.
What sizes does the Vertical Planetary Mixer come in?
B&P Littleford's Vertical Planetary Mixer is available in working capacities ranging from 50 mL (Micro model) up to 1,800 gallons (the Regal model), with mid-range options for pilot, small-batch, and full-scale production in between.
What makes the Regal model different from the standard Vertical Planetary Mixer line?
The Regal is B&P Littleford's largest Vertical Planetary Mixer, purpose-built for solid rocket propellants and explosives. Rather than two blades, it uses three agitators — one centered and two orbiting around it — to combine shear, kneading, stretching, pumping, and plowing action at an 1,800-gallon working capacity.
Can I test the Vertical Planetary Mixer before purchasing?
Yes. B&P Littleford's Technology Center in Saginaw, Michigan is available for confidential product evaluations using your specific materials and formulations. Our engineers will work with you to generate empirical performance data that can be used to confidently specify and scale the right mixer for your production needs.
What safety measures are built into the Vertical Planetary Mixer for energetics processing?
The Vertical Planetary Mixer draws on B&P Littleford's energetics heritage, bringing inherent levels of safety and reliability not found elsewhere. This includes drive train components engineered for robust, dependable operation and a mixing design specifically developed for the safe handling of propellants, explosives, and pyrotechnics.