What is Klüber Klübersynth UH1 14-1600 Food-Grade?
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What is Klüber Klübersynth UH1 14-1600 Food-Grade?
Klübersynth UH1 14-1600 is a fully synthetic, semi-fluid lubricating grease engineered by Klüber Lubrication specifically for the food-processing and pharmaceutical industries. It is formulated with a synthetic hydrocarbon (polyalphaolefin, or PAO) base oil and an aluminium complex soap thickener, yielding an NLGI 00 consistency grade — a fluid, pumpable grease that flows readily in enclosed gear housings and centralised lubrication systems. The product carries NSF H1 registration (No. 136695), signifying compliance with FDA 21 CFR Section 178.3570 for lubricants with incidental, technically unavoidable food contact, and holds ISO 21469 certification for hygienic manufacturing. Its primary purpose is the immersion (splash) lubrication of toothed gears, worm gears, and drive chains operating in hygienically sensitive production environments where a conventional gear oil may not provide sufficient adhesion or where a fluid grease offers operational advantages over a liquid oil in terms of sealing behaviour and reduced leakage. The measured density at 20 °C is approximately 0.85 g/cm³ (DIN 51757), and the worked penetration at 25 °C falls within 400–430 x 0.1 mm (DIN ISO 2137), placing the product firmly in the semi-fluid category.
Key Technical Characteristics
The foundation of Klübersynth UH1 14-1600 is a synthetic hydrocarbon (PAO) base oil. PAO chemistry provides several inherent advantages over mineral oils and pharmaceutical white oils: a naturally high viscosity index that maintains lubricating film strength across a wide temperature window, significantly greater oxidation resistance — typically extending service life by a factor of up to four compared to equivalent-viscosity mineral oil formulations — and excellent low-temperature fluidity without the wax crystallisation issues that affect mineral oils below 0 °C. The base oil is paired with an aluminium complex soap thickener, a technology widely specified in food-grade greases because of its smooth, fibrous texture, strong adhesion to metal surfaces, and inherent corrosion protection properties. Unlike simple soap thickeners, the aluminium complex structure provides a dropping point exceeding 220 °C (DIN ISO 2176), which means the grease retains structural integrity well beyond its recommended upper service temperature of 120 °C (248 °F).
The NLGI 00 consistency grade is a defining characteristic of this product. On the NLGI scale — where 000 is the most fluid and 6 is the stiffest — grade 00 represents a semi-fluid consistency comparable to applesauce or heavy cream. This fluidity allows the grease to flow under gravity and be distributed by splash or immersion mechanisms inside enclosed gearboxes, behaving like a gear oil while retaining the adhesive, non-drip properties of a grease. The worked penetration range of 400–430 x 0.1 mm at 25 °C (DIN ISO 2137) confirms this semi-fluid behaviour. The operating temperature range spans from -45 °C (-49 °F) to 120 °C (248 °F), a breadth enabled by the PAO base oil's low pour point and the aluminium complex thickener's thermal stability. Under the FZG scuffing load test (DIN ISO 14635-3, A/2.8/50), the product achieves a failure load stage of 11 or higher, indicating substantial gear tooth protection under mixed and boundary lubrication regimes. An important practical note for maintenance planners: Klüber documentation identifies a characteristic very rapid increase in worked penetration over approximately six months of storage, after which the product may fall outside its specified NLGI classification. Inventory should be rotated on a first-in, first-out basis accordingly.
How Klubersynth UH1 Lubricants Work
Lubrication with Klübersynth UH1 14-1600 operates through the combined action of its PAO base oil and aluminium complex thickener matrix. The base oil is the primary load-carrying component: under hydrodynamic and elastohydrodynamic lubrication (EHL) conditions, the relative motion of gear teeth or chain pins draws the oil into the contact zone, generating a pressurised fluid film that physically separates the opposing surfaces. Because PAO molecules are uniform in structure — unlike the mixed hydrocarbon chains found in mineral oils — the film exhibits consistent shear behaviour and predictable viscosity-temperature response, maintaining adequate film thickness even as operating temperatures fluctuate between cold start-up and steady-state conditions.
The aluminium complex thickener serves a dual function. First, it acts as a mechanical reservoir: the thickener fibres form a three-dimensional network that holds the base oil in place through capillary and surface-tension forces, releasing oil gradually into the contact zone as temperature rises and mechanical shear is applied. This controlled bleed mechanism is essential for immersion-lubricated gearboxes, where a conventional oil might drain away from gear flanks during idle periods, leaving surfaces unprotected at the next start-up. Second, the thickener fibres themselves contribute to lubricating film formation under boundary and mixed lubrication conditions, when speeds are too low or loads too high for a full fluid film to develop. The aluminium complex chemistry provides adhesion to ferrous surfaces, forming a residual protective layer that persists during shutdowns and protects against fretting and corrosion.
At the low end of the temperature range (-45 °C), the PAO base oil retains sufficient fluidity to flow through centralised lubrication lines, with flow pressures measured in the range of 80–100 hPa at -30 °C for comparable formulations. At the upper end (120 °C), the synthetic base oil resists thermal degradation and evaporation far more effectively than a mineral oil of comparable viscosity, while the aluminium complex thickener remains structurally stable — the dropping point above 220 °C provides a substantial safety margin. The formulation is specifically suited to immersion-lubricated enclosed gears and chains because the semi-fluid consistency enables splash distribution during operation while providing enough body to remain in place on gear flanks during idle periods, reducing the start-up wear that accounts for a disproportionate share of total gear tooth life consumption.
Industrial Applications
Klübersynth UH1 14-1600 is specified across a range of food and pharmaceutical manufacturing equipment where incidental food contact is technically unavoidable and where a semi-fluid, adhesive lubricant offers operational advantages. Its NLGI 00 consistency and NSF H1 registration make it suitable for the following application environments:
Enclosed gear drives in food processing lines: Mixers, blenders, and agitator drive gearboxes in bakeries, confectionery plants, and ready-meal production facilities benefit from the product's ability to lubricate by splash while resisting leakage through worn or imperfect shaft seals — a common challenge when using straight gear oils in ageing equipment.
Worm gear reducers: The sliding contact inherent in worm gear meshing demands a lubricant with strong surface adhesion and high scuffing resistance. The FZG failure load stage of 11 confirms adequate protection under the high-sliding-speed, high-contact-pressure conditions characteristic of worm drives in conveyor systems and packaging machinery.
Conveyor drive chains in bottling and canning lines: Chains operating in beverage filling, can seaming, and bottling plants are exposed to frequent wash-down cycles, humidity, and occasional product spillage. The aluminium complex thickener provides water-resistant adhesion that keeps the lubricant on chain pins and bushings despite moisture exposure.
Filling and dosing equipment: Rotary filling machines, piston fillers, and volumetric dosing systems in dairy processing and pharmaceutical manufacturing require lubricants that will not contaminate product in the event of incidental contact. The NSF H1 registration and ISO 21469 certification support compliance with HACCP-based food safety plans.
Packaging machinery cam and guide systems: Cartoning machines, case packers, and shrink-wrapping equipment employ cam-driven mechanisms and linear guides that operate at moderate speeds under intermittent loading. The product's semi-fluid consistency allows it to be distributed through centralised automatic lubrication systems, reducing manual greasing labour and improving application consistency.
Can seaming equipment: Can seamers in food and beverage canning lines operate at high cyclic rates (commonly 600–2,000 cans per minute) and require a lubricant that remains in place on seaming rolls and chucks without being thrown off by centrifugal force, while meeting food-safety compliance requirements.
Dairy processing equipment: Separators, homogenisers, and pasteurisation equipment subject lubricants to a combination of moisture, thermal cycling, and frequent sanitation procedures. The corrosion protection provided by the aluminium complex thickener formulation is particularly relevant in these wet-processing environments.
Freezer and cold-store conveyor systems: Spiral freezers, tunnel freezers, and cold-store handling equipment operate at temperatures as low as -40 °C. The PAO base oil's wax-free chemistry ensures that the lubricant remains fluid and pumpable at these temperatures, unlike mineral oil greases that stiffen due to wax crystallisation.
Centralised automatic lubrication systems: The NLGI 00 consistency permits distribution through pinion-type and progressive-divider lubrication systems over line lengths typical of medium-to-large food processing plants (commonly 10–50 metres). The product is supplied in 370 g cartridges, 1 kg cans, and 25 kg pails to accommodate both manual application and bulk system reservoirs.
Pharmaceutical tablet press and capsule filling machinery: These high-precision machines operate under cleanroom conditions with stringent contamination control requirements. The ISO 21469 certification, which verifies that the lubricant is manufactured under hygienic conditions from formulation through packaging, supports pharmaceutical GMP compliance programmes.
How It Compares
Within the Klübersynth UH1 product family, the 14-1600 variant occupies a distinct position as the semi-fluid gear and chain lubricant. The UH1 14-222 is an NLGI 2 general-purpose bearing grease with a base oil viscosity of approximately 260 mm²/s at 40 °C and a service temperature range of -25 °C to 120 °C — a suitable choice for rolling element bearings, guide rods, and cams where a stiffer consistency is required to remain in place. The UH1 14-31 is formulated for low-temperature applications (freeze and deep-freeze tunnels) with a soft consistency and excellent pumpability in centralised systems. The UH1 14-151 is a general-purpose food-grade grease with anti-wear and corrosion protection properties. Choosing between these variants depends primarily on the lubrication mechanism required: immersion or splash-lubricated enclosed systems call for the semi-fluid 14-1600, whereas point-lubricated rolling bearings are better served by an NLGI 1–2 consistency grade.
Compared with the Klübersynth UH1 6-series polyglycol-based gear oils, the 14-1600 offers a different set of trade-offs. The 6-series oils (available in ISO VG 150 through 680) provide high scuffing resistance, excellent micropitting protection, and energy-saving friction characteristics derived from polyglycol chemistry. However, polyglycol oils can be incompatible with certain seal materials and paint coatings, and they are not miscible with mineral oils, requiring thorough system flushing during conversion. The PAO-based 14-1600 is generally seal-compatible and miscible with mineral oils, simplifying changeover procedures. Against conventional mineral oil-based food-grade lubricants, the PAO formulation provides substantially longer service life through higher oxidation resistance and a wider operating temperature window, though at a higher initial procurement cost per kilogram. The aluminium complex thickener also provides better water resistance than lithium or calcium soap-thickened alternatives commonly used in general industrial greases, making the 14-1600 a commonly selected product for wet-processing food environments.
Application & Maintenance Guidelines
Klübersynth UH1 14-1600 should be stored in its original, unopened container in a dry, frost-free location. The manufacturer specifies a minimum shelf life of approximately 12 months under these conditions. A material-specific characteristic — the very rapid increase in worked penetration over approximately six months — means that inventory rotation on a first-in, first-out basis is essential. Product that has aged beyond six months should be tested for worked penetration before use to confirm it remains within the specified NLGI 00 limits.
The product can be applied by brush, spatula, grease gun, or via centralised lubrication systems. When charging an enclosed gearbox, fill to the manufacturer's recommended level — typically sufficient for the gear teeth to dip into the lubricant and distribute it by splash. Overfilling can cause excessive churning losses, temperature rise, and potential leakage. During initial fill or changeover, existing lubricant should be drained and the housing cleaned where practicable. While PAO base oils are generally miscible with mineral oils, mixing with a residual mineral product will dilute the performance advantages of the synthetic formulation, particularly in terms of oxidation stability and low-temperature behaviour. Compatibility with polyglycol oils is limited; a changeover from a polyglycol-based product should include thorough flushing with a compatible flushing oil.
Relubrication intervals depend on operating temperature, load, speed, and environmental contamination. As a general guideline for food-processing gear drives operating at moderate loads and temperatures below 80 °C, an oil drain interval of 3,000–5,000 operating hours is a common starting point, subject to confirmation by condition monitoring. Used lubricant samples should be periodically analysed for viscosity change, acid number increase (indicating oxidation), water content, and wear metal concentration. A 10% increase in kinematic viscosity at 40 °C or an acid number increase of 0.3 mg KOH/g above the fresh-oil baseline are commonly used alert limits. The product's FZG scuffing load stage of 11 should not be relied upon indefinitely; additive depletion over extended service intervals reduces extreme-pressure performance, and condition-based oil change practices are recommended.
Frequently Asked Questions
Q1: What does NSF H1 registration mean for Klübersynth UH1 14-1600, and how does it differ from H2?
NSF H1 registration (No. 136695 for this product) certifies that the lubricant is formulated from ingredients listed in FDA 21 CFR Section 178.3570 and is acceptable for use in food-processing environments where incidental, technically unavoidable contact with food may occur — at a maximum concentration of 10 mg/kg (10 ppm) in the finished food product. This is distinct from NSF H2 lubricants, which may only be used in areas where there is no possibility of food contact. ISO 21469 certification, which this product also holds, goes a step further by auditing the manufacturing process from raw material receipt through final packaging to verify that hygienic production practices are maintained throughout, providing additional assurance for HACCP and GMP compliance programmes.
Q2: Why is NLGI 00 used for gear lubrication instead of a conventional gear oil?
NLGI 00 semi-fluid greases occupy a middle ground between conventional gear oils and stiffer greases. The fluid consistency permits splash and immersion distribution inside gearboxes, just as a liquid oil would, but the thickener matrix provides several advantages: reduced leakage through worn or imperfect seals — a common issue in older food-processing machinery — better adhesion to gear flanks during shutdown periods, which reduces start-up wear, and a degree of sealing action that helps exclude external contaminants. In centralised lubrication systems, NLGI 00 products remain pumpable over long line lengths while resisting the gravitational drain-back that can leave lubrication points starved when a straight oil is used.
Q3: How does the aluminium complex thickener contribute to lubricant performance?
The aluminium complex soap thickener in Klübersynth UH1 14-1600 forms a fibrous, three-dimensional network that holds the PAO base oil in suspension and releases it progressively under heat and mechanical shear. Aluminium complex thickeners are characterised by a dropping point exceeding 220 °C, smooth dispensing characteristics in automated systems, and inherent water resistance — an important attribute in food-processing environments subject to frequent wash-down procedures. The thickener also contributes to corrosion protection by forming a tenacious, water-repellent film on ferrous surfaces, which is particularly relevant in dairy, beverage, and meat-processing facilities where equipment is exposed to moisture, mild acids, and cleaning chemicals. The fibres are shear-stable under normal operating conditions, though prolonged mechanical working at elevated temperatures will gradually soften the grease — refer to the manufacturer datasheet for specific mechanical stability data.
Q4: Can Klübersynth UH1 14-1600 be mixed with other greases or gear oils?
In general, mixing lubricants from different thickener families or base oil chemistries is not recommended without confirming compatibility. PAO synthetic hydrocarbon base oils are physically miscible with mineral oils, so incidental mixing with residual mineral gear oil is unlikely to cause gelation or precipitate formation. However, mixing reduces the performance advantages of the synthetic formulation — oxidation stability, low-temperature fluidity, and service life may all be compromised. Mixing with polyglycol-based products (such as the Klübersynth UH1 6-series gear oils) should be avoided, as PAO and polyglycol chemistries are generally immiscible and can form separate phases. Mixing greases with different thickener types (for example, lithium, calcium, or polyurea) can cause the thickener structures to interfere, potentially resulting in significant softening or hardening. When changing over from another lubricant, the existing fill should be drained, and the housing flushed with a compatible product before charging with fresh UH1 14-1600.
Q5: What is the significance of the FZG scuffing load stage result of 11?
The FZG (Forschungsstelle für Zahnräder und Getriebebau) scuffing test, conducted per DIN ISO 14635-3 using the A/2.8/50 procedure, evaluates a lubricant's ability to prevent scuffing — a severe form of adhesive wear — on loaded gear teeth. The test runs standardised spur gears under increasing load stages until the sum of the width of scuffed areas on the pinion flanks exceeds a threshold. A failure load stage of 11 corresponds to a Hertzian contact stress of approximately 1,641 N/mm² at the pitch point and a pinion torque of approximately 265 Nm. This result indicates that Klübersynth UH1 14-1600 provides robust protection against scuffing under moderate-to-high load conditions typical of industrial gear drives. For context, load stage 12 (approximately 1,841 N/mm²) is the highest stage in the standard A/2.8/50 procedure. Engineers should note that FZG results are determined under standardised laboratory conditions and that field performance depends on the specific gear geometry, speed, load spectrum, and operating temperature of the application.
Sourcing Klubersynth UH1 Products
KOEED is an authorised distributor of Klüber Lubrication products, including the full Klübersynth UH1 range. We supply Klübersynth UH1 14-1600 in factory-sealed packaging — 370 g cartridges, 1 kg cans, and 25 kg pails — with full traceability to the manufacturer. Worldwide shipping is available. For a quotation, current lead times, or to request the product datasheet and material safety data sheet (MSDS), contact our technical sales team at Moritta@KOEED.COM. As an authorised distributor, we can also assist with product selection across the UH1 series, including the 14-222 bearing grease, the 14-31 low-temperature variant, and the 6-series polyglycol gear oils, to help match the correct lubricant to your specific application requirements.