MOLYKOTE FS-XM-1669U is a white, NLGI Grade 2 fully synthetic fluorosilicone grease manufactured by Molykote (Dow). It is thickened with chemically inert PTFE and based on fluorosilicone fluid, designed for heavy-load, aggressive chemical environment and high-temperature lubrication applications.
This grease features extremely low volatility and excellent oxidation resistance, remaining stable without melting or bleeding over a service temperature range of -40°C to +230°C (up to +260°C short term). It is chemically inert to acids, chlorides, and many solvents, and compatible with most plastics, elastomers and metals. It is applied by brush, grease gun or centralized lubrication systems and should not be mixed with other grease types.
| Property | Value | Test Method / Note |
|---|---|---|
| Appearance (Uncured) | White smooth grease | — |
| Thickener | PTFE (Polytetrafluoroethylene) | Chemically inert |
| Base Oil | Fluorosilicone Fluid | — |
| NLGI Consistency Grade | 2 | — |
| Worked Penetration | 265 – 295 mm/10 | ASTM D217 |
| Density @ 20°C | approx. 1.5 g/cm³ | — |
| Base Oil Viscosity | 1000 mm²/s @ 25°C | — |
| Service Temperature Range | -40 to +230 °C | Short term up to +260 °C |
| 4-Ball Weld Load | 3200 N | DIN 51350 pt.4 |
| 4-Ball Wear Scar (800 N) | approx. 2.3 mm | DIN 51350 pt.4 |
| Corrosion Resistance (EmCor) | Rating 2 | DIN 51802 / SKF-EmCor |
| Dropping Point | > 300 °C (non-melting type) | — |
| Shelf Life | 5 Years (unopened, sealed) | Store cool & dry |
| Typical Packaging | 1 kg can / 4.5 kg pail | — |
Unlike conventional lithium or polyurea greases, FS-XM-1669U's fluorosilicone fluid structure provides superior resistance to fuels, solvents and aggressive chemicals (4-ball weld load 3200 N, wear scar 2.3 mm @ 800 N). Its high density (~1.5 g/cm³) and high dropping point prevent softening/bleeding on hot bearing surfaces. Passes SKF-EmCor corrosion test (rating 2), suitable for humid/splash environments. NLGI 2 penetration (265–295 mm/10) ensures good water-washout resistance and adherence.
Typical applications include — lubrication of seals/O-rings, rolling and plain bearings in pumps, valves and loading arm joints in chemical & petrochemical plants; friction points exposed to acids, alkalis, solvents, fuels or halogenated hydrocarbons; peripheral chemically-exposed lube points on food processing equipment (non-food-contact zone); and industrial motor or kiln fan bearings requiring water-washout resistance and wide temperature stability.
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