ASTM D2000 line callouts, set against your compound data for a quality person to judge.

A customer's print or purchase order carries a line callout or points to its own material specification. Someone in your quality group takes the line apart, finds the compound you would run, pulls its data sheet and the reports on file, and works out whether each part of the requirement has a result behind it. Sometimes the answer is a suffix test nobody has run on that compound.

In the test, AI reads copies of callouts your staff already worked and drafts the comparison in your format: the requirement, the report line it read, the result and the date, and not shown beside any requirement with no result behind it. The finding stays with your quality person, who holds it against the review that was actually done.

The line packs a classification into one string. ASTM D2000, now D2000-18(2024)e1, sorts vulcanized rubber by type, for resistance to heat aging, and class, for resistance to swelling in oil, with a grade digit and suffixes carrying the rest. Its scope says a detailed product specification controls where the two conflict, and that a purchaser with needs too specific for the system should work out properties, test methods and limits with the supplier in advance. SAE's own classification, J200, was revised in March 2023. A print may cite any edition or none, so the draft records the one the customer named next to the one your data sheet used, and it flags a difference without calling it a problem.

A suffix is a test requirement, and a data sheet may not reach it. The letters after the basic designation call for particular tests, such as compression set under ASTM D395, air oven aging under D573, the effect of liquids under D471 and ozone cracking under D1149. A Z suffix means the buyer wrote the requirement, so its meaning has to be found elsewhere on the print. A compound sheet can list original properties and nothing more. The draft lists each suffix, the report line it matched and the test conditions as written, and writes not shown wherever no report answers it.

The word grade does not travel between documents. In a D2000 line it is a single digit near the front. On a bridge bearing pad it is a low-temperature grade: Oklahoma's Special Provision 733-1 asks for Grade 2 in a crystallization resistant polychloroprene compound, a 2012 Minnesota DOT memo calls for Grade 4 at a durometer of 60 ±5 on the Shore A scale, and Michigan's guidance document notes that AASHTO's construction default of Grade 3 would suit only the lower third of the state's lower peninsula. A sheet that just says grade 2 can mean either, and the draft never equates them.

Hardness can stand in for the number that counts. Michigan's guidance repeats AASHTO's caution that hardness results vary and track shear modulus only loosely, and it says the department moved from specifying hardness to specifying shear modulus with its 1996 specifications. Oklahoma accepts a pad specified by durometer only if shear modulus still reaches a minimum tied to that durometer, 110 psi at 50, 150 at 60 and 235 at 70, and wants a Type A certification and one full-size finished pad per lot, size, type or shipment. AASHTO M 251, as Michigan summarizes it, caps a lot at 100 bearings from one batch of elastomer and one cure, and rejects the lot if a sample fails. So the comparison ties each result to its batch and lot, and says when a result came from a test piece rather than a finished part, the subject of ASTM D3183 on preparing pieces from products.

Food and water call for a different kind of proof. FDA's 21 CFR 177.2600, on rubber articles intended for repeated use, tests the food-contact surface of the finished article: in distilled water at reflux, no more than 20 milligrams of extractives per square inch in the first 7 hours and 1 milligram in the next 2, and in n-hexane for fatty foods, 175 and 4. Its list of permitted substances includes chloroprene polymers and vinylidene fluoride copolymers. NSF/ANSI 61, Drinking Water System Components, Health Effects, is a separate document again. A D2000 line speaks to neither, so the draft gives them separate rows. Your reviewer, the person who knows this compound work best, usually the quality manager, decides what each report is good for. These are summaries of public documents, not legal or engineering advice.

With your reviewer's approval, new callouts and material specifications get the same comparison for about 30 days.

A qualified quality person decides each one and signs every certification. A person approves each comparison before it goes anywhere, and how approved comparisons reach your files gets settled for the live month.