{"dataset":"Vajra Valve Material Index (VMI) Dataset","id":"valve-material-index","description":"The VMI: valve materials scored 0-100 on service versatility via a disclosed methodology computed from the compatibility dataset.","publisher":"Vajra Industrial Solutions","publisherUrl":"https://www.vajravyuh.com","sourcePage":"https://www.vajravyuh.com/resources/valve-material-index","downloadUrl":"https://www.vajravyuh.com/data/valve-material-index.json","license":"Free to use with attribution to Vajra Industrial Solutions (vajravyuh.com)","citation":"Vajra Valve Material Index (VMI), Vajra Industrial Solutions, vajravyuh.com/resources/valve-material-index","disclaimer":"Engineering reference data for valve service; indicative only. Ratings and limits depend on concentration, temperature and service conditions. Verify against the governing standard and a qualified engineer before procurement.","recordDescription":"One record per ranked material with score components and tier.","fields":["rank","material","vmi","tier","versatility","meanScore","excellenceRate","fluidsRated","ratingsBreakdown"],"recordCount":11,"records":[{"rank":1,"material":"SS 316L","vmi":90,"tier":"Universal","versatility":35,"meanScore":3.29,"excellenceRate":0.78,"fluidsRated":45,"ratingsBreakdown":{"excellent":26,"good":9,"fair":8,"poor":1,"notRecommended":1}},{"rank":2,"material":"Carbon Steel","vmi":88,"tier":"Universal","versatility":37,"meanScore":2.77,"excellenceRate":0.7,"fluidsRated":53,"ratingsBreakdown":{"excellent":20,"good":17,"fair":5,"poor":6,"notRecommended":5}},{"rank":3,"material":"PTFE","vmi":59,"tier":"Broad","versatility":13,"meanScore":3.77,"excellenceRate":1,"fluidsRated":13,"ratingsBreakdown":{"excellent":10,"good":3,"fair":0,"poor":0,"notRecommended":0}},{"rank":4,"material":"Hastelloy C-276","vmi":55,"tier":"Broad","versatility":12,"meanScore":3.53,"excellenceRate":0.8,"fluidsRated":15,"ratingsBreakdown":{"excellent":11,"good":1,"fair":3,"poor":0,"notRecommended":0}},{"rank":5,"material":"PTFE seals","vmi":53,"tier":"Selective","versatility":8,"meanScore":4,"excellenceRate":1,"fluidsRated":8,"ratingsBreakdown":{"excellent":8,"good":0,"fair":0,"poor":0,"notRecommended":0}},{"rank":6,"material":"PTFE-lined","vmi":49,"tier":"Selective","versatility":8,"meanScore":3.56,"excellenceRate":0.89,"fluidsRated":9,"ratingsBreakdown":{"excellent":6,"good":2,"fair":1,"poor":0,"notRecommended":0}},{"rank":7,"material":"Titanium","vmi":43,"tier":"Selective","versatility":5,"meanScore":3.5,"excellenceRate":0.83,"fluidsRated":6,"ratingsBreakdown":{"excellent":5,"good":0,"fair":0,"poor":1,"notRecommended":0}},{"rank":8,"material":"Duplex 2205","vmi":40,"tier":"Selective","versatility":7,"meanScore":2.82,"excellenceRate":0.64,"fluidsRated":11,"ratingsBreakdown":{"excellent":4,"good":3,"fair":3,"poor":0,"notRecommended":1}},{"rank":9,"material":"Bronze/Brass","vmi":38,"tier":"Selective","versatility":10,"meanScore":2.19,"excellenceRate":0.63,"fluidsRated":16,"ratingsBreakdown":{"excellent":2,"good":8,"fair":1,"poor":1,"notRecommended":4}},{"rank":10,"material":"Ductile Iron","vmi":37,"tier":"Selective","versatility":6,"meanScore":2.71,"excellenceRate":0.86,"fluidsRated":7,"ratingsBreakdown":{"excellent":0,"good":6,"fair":0,"poor":1,"notRecommended":0}},{"rank":11,"material":"PTFE seats","vmi":34,"tier":"Specialist","versatility":5,"meanScore":2.57,"excellenceRate":0.71,"fluidsRated":7,"ratingsBreakdown":{"excellent":2,"good":3,"fair":0,"poor":1,"notRecommended":1}}],"methodology":"For each material rated against >= 6 fluids: Versatility = fluids handled at Excellent or Good; MeanScore = mean rating rank (Excellent=4 .. Not Recommended=0); VMI = 60 x (Versatility / maxVersatility) + 40 x (MeanScore / 4), scaled 0-100. Tiers: Universal 75+, Broad 55-74, Selective 35-54, Specialist <35. The weighting is Vajra's published methodology; every underlying rating is real data."}