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Food-grade machinery lubricants

Food machinery lubricants are greases and oils used in food, beverage, and pharmaceutical manufacturing equipment, for bearings, chains, gears, and other parts that may incidentally contact products. They are mainly formulated from ingredients confirmed safe for human contact and registered under categories such as NSF H1 (incidental food contact acceptable). Base oils include white mineral oil, synthetic oils such as PAO, and PFPE (fluorinated oil) for high temperatures, while thickeners include calcium sulfonate complex and PTFE. Selection depends on operating conditions such as wet environments exposed to washdown water or steam, high-temperature zones such as bakery ovens, and centralized lubrication systems.

How to choose Food-grade machinery lubricants

  1. 1. Confirm food contact acceptability by NSF registration category

    H1-registered products are generally used where incidental contact with food is possible. H2 is intended for locations with no food contact. Documentation for manufacturing safety management systems (such as HACCP) may require registration numbers, so check the NSF registration number and whether the product is registered under ISO 21469.

  2. 2. Match the operating temperature range to equipment conditions

    Suitable products differ between ambient to moderate-temperature zones, such as conveyors and packaging machines, and high-temperature areas such as bakery ovens. Greases using PTFE thickener and PFPE base oil include examples for high-temperature use of 180 to 240°C. For refrigerated or low-temperature equipment, also check pumpability at the minimum operating temperature.

  3. 3. Judge heat resistance and service life by base oil type

    White mineral oil is suited to general-purpose applications, while synthetic oils such as PAO offer superior low-temperature performance and oxidation stability. PFPE shows low evaporation loss at high temperatures and suits severe environments. However, mixing different base oil types may reduce performance, so when switching from an existing product, remove the old grease before refilling.

  4. 4. Select thickener for water resistance and load capacity

    Calcium sulfonate complex thickeners offer excellent water resistance, corrosion resistance, and extreme pressure performance, making them suitable for wet environments exposed to washdown water and for bearings under high loads. For high-load applications, also refer to the four-ball weld load (e.g., 3400 N). Mixing with dissimilar thickeners can cause softening or separation, so confirm compatibility.

  5. 5. Match base oil kinematic viscosity to load and speed

    Listed products have a kinematic viscosity at 40°C of 150 to 460 mm2/s. Higher viscosity suits low speed and high load, while lower viscosity suits high-speed rotation, from the standpoint of oil film formation and heat suppression. Select by comparing the required viscosity specified by the bearing manufacturer with the operating temperature, and for high-temperature operation also check the kinematic viscosity at 100°C (16 to 42 mm2/s).

  6. 6. Match consistency grade and package size to the lubrication method

    NLGI 2 is a common consistency for bearings. For automatic lubricators and centralized lubrication systems, select a grade with suitable pumpability. Package sizes range from 1 kg to 420 kg; choose cartridges for manual grease guns and pails or drums for systems with many lubrication points. The guideline for storage of unopened product is 2 years.

This guide was written by AI based on the listed products' documents and specification items. Check each manufacturer's documents before adopting.