viscosity of paraffin oil in poise
The reason it will be explained in this post is because for lubing a bicycle chain with oil, it is important to know how viscous (i.e. 0000011856 00000 n Because of this post’s subject (bicycle chain lubricants), there is no need for a table, just a rough comparison with (for this use) motor oils of similar “thickness”: For multigrade gear oils, similar to multigrade motor oils, the number before the “W” mark is relevant. I’ve dedicated a chapter (easily skipped) to explaining SAE viscosity grades for readers who (want to) use lubes with a given SAE viscosity grade, without an ISO VG. Bicycle cassette compatibility. . Characteristics that a chain lubricant should poses Hydraulic oil . 0000019401 00000 n Chain wear measurement 0000036767 00000 n pressurized hydraulic line). .
This is a mixture of oil and wax which occurs during the refining process of lubricating oils.
Usual viscosity of chainsaw oil is around ISO VG 100 (similar viscosity to SAE 30 engine oil). 8.2.3. Many lubricant characteristics are given from author’s personal experience and available data of the ingredients and properties. Main advantage of dry lubes is that they attract less dirt – they aren’t as sticky as wet lubes.
They usually come in “medium thick” grades – ISO VG 32 and ISO VG 46, but are produced in viscosity grades from ISO VG 15 to ISO VG 100. Good adhesion, i.e. 0000019366 00000 n As an Amazon Associate I earn from qualifying purchases. may be fatal if swallowed and enters airways, IF SWALLOWED: Immediately call a POISON CENTER/doctor, do NOT induce vomiting, Occupational Safety and Personal Protection, Microbiology, Cell culture, Sterilization. You can search for and download your certificate of analysis for the selected product here. Wet lubricant viscosity and it’s effect on characteristics Find NCBI SARS-CoV-2 literature, sequence, and clinical content: https://www.ncbi.nlm.nih.gov/sars-cov-2/. ™” These lubricants are often advertised as “universal”, “all (weather) conditions”, “road and off-road” and similar, since they are not “pure” dry, nor wet lubricants. 8.2.4. Lubricant viscosity (explained in chapter 6.) of viscosity is the poise (P) = 1g/ (cm) (sec) and is a measure of mass flow of a liquid. 0000026664 00000 n In practice, this means they “absorb”, but also “loose” lubricant more quickly, and thus wear a lot faster. Good adhesion For example, a lubricant that is resistant to water washout will be even more resistant if more viscous, and less resistant if “thinned”. Chain needs to be clean of any dirt or other lubricants, before applying them, so they can stick to it well and prevent dirt from sticking to it. Note the lack of bushings as the main difference. Some commercial paraffin wax based chain lubricants often have other dry lubricants added (usually PTFE), in order to improve characteristics. Loads that bicycle chain bears are relatively low. Only mentioned in two of the lubricant types. 0000001841 00000 n 6. Sanding pastes are usually made with friction materials suspended in some oil. %PDF-1.4 %���� 1 mPa*s = 1 cP Published by Elsevier Ltd. After years of experience and experimentation, dozens and dozens of chains worn and replaced, I have come to some conclusions on the subject, which I will share in this blog. A study was carried out to determine the effect of higher shear rates (64.5 to 4835 s −1 ) on the absolute viscosities of different vegetable oils at different temperatures (26 to 90°C). No matter how strong a rider, bicycle chain will not face such pressures.
Keeping the chain well lubricated and running quietly Ranging from those who remove chain, clean it in an ultrasonic jewellery cleaner, to those that just wipe and drop some oil on a chain from time to time. Cleanliness, i.e. |
Paraffin oil, often called “medicine paraffin oil”, or “cosmetics oil”, is a highly refined mineral oil. It is measured in pascal-seconds (Pa*s), in practice usually in order of magnitude mPa*s. Before acceptance of SI standard, it was measured in cP (centipoise). The absolute viscosities of the different vegetable oils were determined using a Lamy Viscometer RM100, a rotating viscometer with coaxial cylinder. Different wet lubricants have different characteristics, with the important ones for lubricating bicycle chains listed in chapter 5. Dilute it per personal preference with some diesel fuel (D2 preferably). They are somewhere in between the wet and dry lubes, in terms of water (both washout and rust) and dirt resistance. Crude oil viscosity as function of gravity - Viscosity at 20°C/68°F and 50°C/122°F for more than 120 crudes is shown as function of specific gravity@15°C/60°F Dynamic or Absolute Viscosity Converting Chart - Dynamic viscosity converting chart with units like Poiseuille - Poise - centiPoise and more SAE 50 thinned with diesel in 1:1 ratio. 8.2.6.
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PTFE possesses great characteristics: it lubricates excellently, repels water, doesn’t let dirt stick to it. 36 52 0000001726 00000 n Rust prevention? Paraffin wax is derived from so-called slack wax. It is noted by Greek letter nu (ν), and measured in m2/s, though in practice mm2/s order of magnitude is often used. A guide to the approximate viscosities of some common liquids at various temperatures. Label usually says something along the lines of: “wax based chain lubricant”. I’ve listed advantages and disadvantages of each lubricant. .
Engine oils of lower API grade class (API SF, or API SG), preferably monograde, for petrol (not diesel) engines, are the better choice than modern, higher API class engine oils, because they contain less detergents and other (needles, or harmful for bicycle chain lubrication) additives. (Sewing) Machine oil Low price Comparing various lubricants: Camshaft (timing) chains of motorcycles take higher loads and speeds, but last for over 50 thousand kilometres. Epub 2013 Nov 24. Would it be an excellent choice for a bike chain lube? 8.2. Comparing them, in terms of bicycle chain lubrication, would be a hard task, since riding conditions vary a lot – comparison in dry conditions would not rate the the same as a comparison in wet conditions. 8.2.2. They can be made with lots of dry lubricant additives and high quality ester oils that stick well to the metal. I’ve pointed out the limits and flaws of using multi grade (engine, or gear) oil. Fine machine oil, of a relatively low viscosity (usually ISO VG 15 to ISO VG 25).
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