Charles Ross &Amp; Son

Charles Ross &Amp; Son is renowned for its mixing and blending equipment, serving industries such as chemicals, pharmaceuticals, and food. Their innovative technologies include high-shear mixers and ribbon blenders, designed for consistency and performance.

FAQ:

What types of mixing equipment does Charles Ross & Son manufacture?

Charles Ross & Son has been building mixing and blending machinery since 1842, and their product line covers a wide range of process equipment used across demanding industrial applications. Their most recognized product categories include Double Planetary Mixers (DPM), High Shear Rotor-Stator Mixers, Ribbon Blenders, Planetary Dispersers, and Tumble Blenders. Each design addresses a specific mixing challenge, from low-viscosity dispersion to extremely thick, paste-like materials that would stall or damage lesser equipment.

The Double Planetary Mixer is arguably the product Ross is best known for. It uses two identical blades that rotate on their own axes while simultaneously orbiting the mixing vessel, producing thorough, consistent blending without the dead zones common in single-shaft designs. Their High Shear Mixers use a rotor-stator assembly to generate intense mechanical and hydraulic shear, making them well suited for emulsification, homogenization, and particle size reduction. Ribbon Blenders are horizontal trough-style machines designed for dry or semi-dry bulk solids. Together, these product lines have made Ross equipment a standard specification across pharmaceuticals, cosmetics, food processing, adhesives, and specialty chemicals.

What industries commonly use Charles Ross & Son mixing equipment?

Ross mixing equipment appears across a broad range of industries, largely because the company has spent decades engineering solutions for materials that are genuinely difficult to process. Pharmaceuticals and nutraceuticals rely heavily on Ross Double Planetary Mixers and High Shear Mixers for ointments, gels, suspensions, and tablet granulations, where batch-to-batch consistency and sanitary construction are non-negotiable. Cosmetics and personal care manufacturers use Ross equipment to produce creams, lotions, serums, and color cosmetics, often in stainless steel jacketed vessels that allow precise temperature control during mixing.

Beyond life sciences and personal care, the chemical industry uses Ross mixers for adhesives, sealants, coatings, and specialty polymers, many of which involve high-viscosity materials that require the torque and shear capabilities Ross machines are built to handle. Food and beverage processors use ribbon blenders and planetary mixers for dry blends, fillings, and confectionery applications. Electronics and advanced materials manufacturers have also adopted Ross equipment for processing battery pastes, encapsulants, and composite materials. This cross-industry demand is one reason used Ross equipment holds its value well and remains actively sought after on the secondary market.

What capacity ranges are available for Ross planetary mixers and double planetary mixers?

Ross Double Planetary Mixers are manufactured across an exceptionally wide capacity range, which is one reason they appear in both small-scale R&D settings and full production environments. Laboratory and pilot-scale units are available from under one quart up to roughly 10 gallons, allowing formulators to develop and validate processes before scaling up. Production models extend from around 10 gallons through 200 gallons or more, with heavy-duty configurations available for the largest batch requirements. The specific capacity needed depends on batch size targets, material density, and how much headspace is required for the product to mix properly without overflow.

When shopping for used Ross planetary or double planetary mixers, capacity is one of the first specifications to confirm. A 2-gallon stainless steel vacuum double planetary mixer, for example, is a common size in pharmaceutical and cosmetics R&D labs where small, precise batches are the norm and vacuum capability is needed to deaerate sensitive formulations. Larger jacketed models with capacities of 10 to 100 gallons are typical in pilot and production settings. Used equipment listings should specify the working capacity rather than the total vessel volume, since those two figures differ. Buyers should confirm this detail directly with the seller before making a purchasing decision.

Why is used Ross mixing equipment considered a strong value on the secondary market?

Ross has been manufacturing mixing equipment in the United States since 1842, and that longevity reflects directly in how their machines are built. The company has long used heavy-gauge stainless steel construction, robust gear drives, and precision-machined components that are designed to run for decades under demanding production conditions. Because the machines are built to last, a well-maintained used Ross mixer can perform comparably to a much newer machine from a less established manufacturer, which makes the secondary market an attractive option for buyers looking to manage capital costs without sacrificing process capability.

The brand's strong reputation also means that parts and technical documentation have historically been available for a wide range of models. Buyers considering used Ross equipment are encouraged to contact the manufacturer directly to assess what level of support is available for a specific model and serial number, since older or discontinued configurations may have more limited parts availability than current production models. The resale value of Ross equipment tends to hold up better than many competing brands, which means buyers can often recoup a meaningful portion of their investment if their production needs change. For industries like pharmaceuticals and cosmetics where equipment specifications are tightly controlled, sourcing a proven Ross machine on the used market is often a deliberate procurement strategy rather than a compromise.

What should buyers look for when evaluating the condition of used Ross mixing equipment?

Evaluating used mixing equipment requires looking beyond surface appearance. For Ross mixers, key mechanical areas to assess include the gearbox and drive train, blade and shaft condition, vessel integrity, and the condition of any seals, gaskets, or mechanical shaft seals. On double planetary mixers, the planetary gearbox is a high-wear component, so signs of oil leaks, unusual noise, or excessive play in the shafts should be noted. Stainless steel vessels should be inspected for pitting, weld repairs, or corrosion, particularly in jacketed models where the jacket welds are subject to thermal cycling over time.

Reputable used equipment dealers will typically offer in-person inspections, video walkthroughs, or photo documentation to give buyers a clear picture of the machine's current state. Some machines may still be in active production at the facility where they are being sold, which can allow for a live operational review arranged between the dealer and the current owner. Buyers should ask specifically about the machine's service history, the application it was used for, and whether any repairs or modifications were made. It is also worth consulting with Ross directly to understand what maintenance intervals are recommended for a given model and what the current availability of wear parts looks like, since that affects long-term operating costs.

What is the typical price range for used Charles Ross & Son mixing equipment?

Pricing for used Ross mixing equipment varies considerably depending on the type of mixer, its capacity, age, configuration, and overall condition. Small laboratory-scale units, such as a 1 to 2 gallon double planetary mixer, can range from a few thousand dollars on the low end to $15,000 or more for well-maintained models with desirable features like vacuum capability, jacketed vessels, or stainless steel construction throughout. Mid-range production units in the 10 to 50 gallon class typically fall somewhere between $20,000 and $60,000 depending on the specific model and accessories included. Larger production mixers with 100-gallon or greater capacity, or specialized high-shear systems, can exceed $100,000 on the used market.

Several factors push prices toward the higher end of any given range. Vacuum capability adds meaningful value because it enables deaeration of sensitive formulations, a feature that is particularly important in pharmaceutical and cosmetics applications. Jacketed vessels that allow heating or cooling during mixing are similarly desirable. Stainless steel construction rated for sanitary or pharmaceutical use commands a premium over general-purpose carbon steel models. Buyers should also factor in the full landed cost of any purchase, including shipping, rigging, and any reconditioning work that may be needed after delivery. Getting a clear picture of those additional costs upfront helps avoid surprises and allows for an accurate comparison between available options.

How does a double planetary mixer differ from other types of industrial mixers?

A double planetary mixer uses two blades that each rotate on their own vertical axis while simultaneously revolving around the center of the mixing vessel, tracing a path that covers the entire cross-section of the bowl with each revolution. This planetary motion eliminates the stagnant zones that are common in single-shaft designs, where material near the vessel walls or bottom may not receive adequate mixing action. The result is a highly uniform blend without requiring the material to flow toward the agitator, which makes the double planetary design particularly well suited for high-viscosity materials like pastes, gels, putties, and thick adhesives that would be difficult or impossible to process in a conventional stirred tank or high-shear mixer.

Compared to ribbon blenders, which are designed for dry or semi-dry bulk solids in a horizontal trough, the double planetary mixer handles wet, viscous, and even extremely stiff materials in a vertical vessel. Compared to high-shear rotor-stator mixers, the double planetary produces lower shear but much higher torque, making it the preferred choice when the goal is to incorporate solids or blend components without generating excessive heat or breaking down particle structure. Many formulations in pharmaceuticals, cosmetics, batteries, and specialty chemicals specifically call for double planetary mixing because it can handle materials with viscosities ranging from a few thousand centipoise up to several million centipoise without requiring the material to be thinned with solvents or heat.

What should buyers understand about inspecting used Ross mixing equipment before purchase?

Purchasing used industrial mixing equipment without an inspection creates real risk, and most established used equipment dealers will offer some form of inspection to help buyers make an informed decision. The most informative option is an in-person visit, which allows a buyer or their engineer to physically examine the machine, check for wear on critical components, assess the condition of the vessel and seals, and observe any operational demonstration that the dealer can arrange. When travel is not practical, many dealers can provide detailed video walkthroughs, high-resolution photographs, or live video calls that cover the machine from multiple angles and highlight any visible wear or damage.

One important limitation to understand is that most used equipment dealers are not licensed production facilities and cannot run actual product through a machine as part of an inspection. Testing with real materials requires production permitting and a controlled environment that a dealer warehouse typically does not have. What a dealer can generally do is confirm that the drive runs, the blades rotate, and the vessel and mechanical components are intact. For machines still located at the facility where they were last used, it may be possible to arrange an inspection where the equipment is still in place and potentially still operational. Buyers should ask about this possibility early in the process, and should also request any available documentation such as maintenance logs, past service records, or the machine's original specification sheet to supplement what they observe during the inspection.

What are typical shipping and logistics considerations when buying used Ross mixing equipment?

Ross mixing equipment ranges from compact laboratory units that can ship on a standard pallet to large production mixers that require specialized rigging, heavy freight carriers, and forklift or crane service at both the origin and destination. For smaller units, the primary concern is proper palletization and securing the machine to prevent movement during transit. Vessels, blades, and any removable components should be packed separately or secured to avoid contact damage. For larger machines, the weight and footprint may require flatbed trucking, and the buyer's facility needs to have the equipment and clearance to receive and position the machine safely.

Buyers should ask the seller for a complete breakdown of packaging, crating, rigging, and freight costs before committing to a purchase, since these expenses can add meaningfully to the total cost of acquisition. A machine priced attractively may become less compelling once full delivery costs are factored in, particularly for buyers located far from the seller. International shipments add customs documentation, import duties, and potentially more extensive crating requirements to the equation. It is also worth confirming whether the seller handles loading at their facility or whether the buyer is responsible for arranging pickup. Getting all of these logistics details in writing before finalizing a purchase helps avoid misunderstandings and ensures the buyer has a realistic picture of the full landed cost.

What payment terms should buyers expect when purchasing used Ross mixing equipment?

Used industrial equipment transactions are generally structured differently from consumer purchases or new equipment orders placed through a manufacturer's sales channel. Most used equipment dealers require payment in full before a machine is released for shipping. This is standard practice across the industry and reflects the fact that dealers typically do not hold long-term financing relationships with buyers the way a manufacturer or distributor might. Accepted payment methods commonly include wire transfer, certified funds, or other forms of cleared payment. Credit card acceptance varies by dealer and may be limited to deposits rather than full payment on larger transactions.

Some dealers will extend payment terms to established customers with a track record of prior purchases, but buyers approaching a dealer for the first time should expect to pay in full upfront. For larger purchases where the total cost is significant, buyers may want to confirm payment logistics early in the negotiation, particularly if internal purchase order or approval processes require lead time. It is also reasonable to ask whether a deposit can hold a machine while financing or internal approvals are arranged, though dealers are not obligated to hold equipment without payment. Understanding these expectations at the outset makes the transaction smoother for both parties and helps buyers plan their procurement timeline accordingly.