properties /measurement

THE REMOVABILITY GRADE THE MAKER DECLARES - low, medium or high. Henkel gives it a field of its own, `Strength`, on the anaerobic range: `Medium` on LOCTITE 243, 577 and 5188, `High` on 271 and 638. The grade is defined by what it takes to undo the joint, and Henkel writes the definition into its own product descriptions - 243 is for fasteners `which require normal disassembly with standard hand tools`, 271 is for `permanent locking`, and its disassembly instruction is to heat the nut to approximately 250 C. Permatex publishes the same three-grade scale on its own threadlockers. IT IS THE MAKER'S OWN PUBLISHED BAND AND NOT A MEASUREMENT, which is stated first because it decides everything else about the slot: Henkel prints the word `Medium` or `High` in a headline field and prints the torque and shear numbers separately, and those numbers - breakaway 22 N.m on M10, compressive shear >7.6 N/mm2 - have no home in the pool at all [H5-f2]. IT IS NOT THE COLOUR AND MUST NOT BE READ OFF IT [A17], and the counter-example is INSIDE ONE HOUSE ON TWO SHEETS READ AT THE MINT: LOCTITE 5188 is red and `Strength Medium` while LOCTITE 271 is red and `Strength High`. Across houses colour is a variation axis in its own right - Sikaflex-221 ships in four colours - so a shelf reading strength off `color` would mis-sell. UNLIKE b155's `heat_range` IT CARRIES NO SCALE QUALIFIER, and the reason is the b156 `friction_grade` reason: the grade is anchored to an absolute functional test - does it come apart with hand tools - and not to a house's private numbering, so two houses' `medium` mean the same thing, where NGK's heat 2 and Bosch's heat 13 did not. The honest caveat is recorded with it: no standard fixes the torque bands, so this is a declared grade and not a measurement, and the measured breakaway torque behind it has no home in the pool today. Concern measurement.