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Similar arguments (or “arguments”) as Reason. Complete misunderstanding of the whole post (and subject), trying to find something to criticize. Don’t know why. Why do trolls troll? 🙂
This is not true. Bicycle bearings are not open with water flowing over them – not even the cup and cone. Not even in pouring rain. They all have at least some kind of dust seal. So they don’t get that much water and don’t need to be 100% waterproof. Polymers are used as thin lubricating films, as self-lubricating materials for elements manufacturing and as a bonding material for lamellar solids. The most famous polymer solid lubricants are tetrafluoroethylene ( TFE), a gas without colour and smell, which with polymerization gives polytetrafluoroethylene( PTFE). PTFE is registered under the (often used) name of Teflon, by DuPont company. One of the most slippery materials on the planet, with a friction coefficient similar to wet ice sliding over wet ice. 🙂 Yes, the working range of the grease is written on the label of said grease. Duh. However, the working range ISN’T determined by grease type! All lithium grease are NOT ONE RANGE!” German DIN 51 502 standard for labeling greases, unlike ISO, with legendary German precision and efficiency sorts greases according to base oil types, additives etc, so there can be no confusion when choosing the appropriate grease for a given application. 🙂 Example of a DIN label:NLGI 2 hardness grade has shown as the best in practice – both personal, and colleague mechanics. Softer greases don’t provide noticeably lower friction (when riding), while they leak out of the bearings more easily. Also NLGI 2 greases hold balls in place better than softer greases, which enables easier servicing.
Because it isn’t designed for prolonged water exposure, because it’s not designed for what you’re trying to make it claim, it’s NOT on the data sheets. There is no “ISO E” universal standard that all data sheets have so you’re looking for a statement that very few, if any, manufacturers claim. In the 1990s, it was found that PTFE could be radiation cross-linked above its melting point in an oxygen-free environment. [13] Electron beam processing is one example of radiation processing. Cross-linked PTFE has improved high-temperature mechanical properties and radiation stability. That was significant because, for many years, irradiation at ambient conditions has been used to break down PTFE for recycling. [14] This radiation-induced chain scission allows it to be more easily reground and reused. Trust what is written on the label, as a marketing slogan. However, there are lithium complex greases with better washout resistance than some “marine greases”. Same goes for other properties.
Most widely used grease type. Widely available, at a low price. Fulfills all the criteria a bicycle bearing grease should satisfy. Water and rust resistance is not as good as that of calcium greases, but it is more than good enough for bicycle bearing application. Wider use temperature range than similar calcium greases. In case of high quality synthetic base oils, temperature range is even greater, though this raises the price significantly, without much measurable benefits for use with bicycle bearings. Perhaps for extreme (-40°C cold) uses. Consistency (hardness) is measured with a cone, by methods standardized underASTM 217 IP 50, or DIN 51804, part 1. Measuring unit represents depth the measuring cone enters the tested grease. Testing procedure is shown in the picture 1. Picture 2
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