Primrose
558 Enviro Blend - Rudder Stalk Grease NLGI #2
558 Enviro Blend - Rudder Stalk Grease NLGI #2
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Primrose Enviro Blend 558 is a non-toxic high performance valve lubricant grease engineered for superior performance with valves & bearings in contact with water. This product is suitable for use in environmentally sensitive areas.
Environmentally, Enviro Blend 558 has passed both protocols of the US Environmental Protection Agency for determining environmentally safe ‘fluids.” In the Acute Toxicity to Mysidopsis Bahia (“Shrimp Test”), the LC-50 value necessary to pass the minimum EPA requirement is 30,000 ppm of sample in the water for 96 hours. Enviro Blend 558 achieved a LC-50 value of greater than 1,000,000 ppm because not one shrimp was dead in a maximum concentration of Enviro Blend 558.
In the Static Sheen Test, Enviro Blend 558 caused no sheen, iridescence, gloss or increased reflectance on the surface of the test seawater, demonstrating that Enviro Blend 558 contains no free oil, making it environmentally friendly to natural waters.
In the Static Sheen Test, Enviro Blend 558 caused no sheen, iridescence, gloss or increased reflectance on the surface of the test seawater, demonstrating that Enviro Blend 558 contains no free oil, making it environmentally friendly to natural waters.
Technical Data Sheet
Open / downloadSafety Data Sheet
Open / downloadKey specifications
- NLGI grade
- No. 2
- Base oil viscosity
- 2000 to 2400 cSt at 40 C
- Dropping point (ASTM D566)
- Non-melt
- Water washout (ASTM D1264)
- Less than 1%
- Salt water spray test
- Pass
- Four-ball weld load (ASTM D2596)
- More than 800 kg
- Shrimp test LC-50 (Mysidopsis bahia, 96 hours)
- More than 1,000,000 ppm (EPA minimum 30,000 ppm)
- Static sheen test
- Pass (no sheen on test seawater)
Summarized from the manufacturer's Technical Data Sheet (see the Technical Data tab above). The full data sheet is the authoritative reference.
Common questions about 558 Enviro Blend - Rudder Stalk Grease NLGI #2
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What is 558 Enviro Blend rudder stalk grease used for?
558 Enviro Blend is an NLGI No. 2 valve lubricant and rudder stalk grease from Primrose, made for valves and bearings in contact with water. It can be applied to wet or even submerged surfaces, and Primrose lists it as suitable for use in environmentally sensitive areas.
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Will 558 Enviro Blend leave an oil sheen on the water, and how did it do in toxicity testing?
No, Primrose says 558 Enviro Blend will not produce a sheen on the water, and in its static sheen test it caused no sheen on the test seawater. Primrose reports that in the 96-hour shrimp toxicity test it reached an LC-50 above 1,000,000 ppm, against a 30,000 ppm EPA minimum. Primrose's Safety Data Sheet still lists skin and eye irritation, so wear gloves and eye protection and wash after handling.
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Will 558 Enviro Blend wash off valves and bearings that are in contact with water?
Very little: 558 Enviro Blend showed less than 1% water washout (ASTM D1264), and Primrose describes it as completely waterproof. Water-repelling, adhesive components help it grip wet surfaces, it passed the salt water spray test, and rust preventive additives help protect metal from rusting.
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What NLGI grade is 558 Enviro Blend, and will it melt in hot weather?
558 Enviro Blend is an NLGI No. 2 grease with a non-melt dropping point (ASTM D566), and Primrose says it will not melt or run off at most any temperature. It stays workable at low temperatures, yet even the hottest equatorial climates will not soften it enough to cause bleeding or oil separation.
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Does 558 Enviro Blend have extreme pressure additives for heavily loaded, sliding surfaces?
Yes, 558 Enviro Blend contains extreme pressure and friction modification additives, and Primrose says it will not pound out or break down under severe loading and sliding pressures. Typical results are a four-ball weld load above 800 kg (ASTM D2596) and a Timken OK load of 65 lbs (ASTM D2509).
