{"product_id":"water-deionized-d-i-18mohm-reagent-grade-acs-grade-type-i-1-gallon-5-gallon-55-gallon","title":"Deionized Water, 18 MΩ, Reagent Grade, ACS Type I","description":"\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat it is.\u003c\/strong\u003e This deionized water is reagent-grade Type I water with 18 megohm resistivity, available in 1-gallon, 5-gallon, and 55-gallon drum sizes. It is ion-free, high-purity water for preparing reagents, dilutions, standards, and precision rinsing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhat Type I means.\u003c\/strong\u003e ASTM D1193 defines Type I reagent water as having a resistivity of at least 18 MΩ·cm and a conductivity no higher than 0.056 µS\/cm at 25 °C, with limits of 50 µg\/L total organic carbon, 1 µg\/L sodium, 1 µg\/L chloride, and 3 µg\/L total silica in the D1193-99 edition.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhy 18 megohm matters.\u003c\/strong\u003e Resistivity measures how strongly water resists electrical current; it decreases as dissolved ions increase. Water at about 18.2 MΩ·cm at 25 °C contains essentially no dissolved ions, making it suitable for trace analysis, standards, and sensitive instrumentation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHow it is made.\u003c\/strong\u003e Type I water is produced through deionization and polishing steps, often combined with reverse osmosis, filtration, and organic removal, reducing ions, organics, and particles to trace levels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistivity falls once opened.\u003c\/strong\u003e Ultrapure water absorbs carbon dioxide from the air within minutes, forming carbonic acid that lowers resistivity well below 18 MΩ·cm. Packaged water serves applications that need ion-free, low-organic water rather than a guaranteed in-use resistivity reading.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLaboratory uses.\u003c\/strong\u003e Type I water is used to prepare standards and reagents, dilute samples for ICP, IC, and HPLC, make buffers and mobile phases, rinse precision glassware, and supply instruments and analyzers that require high-purity water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeionized versus distilled.\u003c\/strong\u003e Deionization removes dissolved ions through ion exchange, while distillation removes impurities by boiling and condensing. Type I deionized water reaches far lower ionic levels than single distillation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree sizes.\u003c\/strong\u003e The 1 gallon (ZW0006-128) suits benchtop reagent work, the 5 gallon (ZW0006-640) supports daily lab use, and the 55 gallon drum (ZW0006-999) serves production, rinsing, and high-volume users.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhere it is used.\u003c\/strong\u003e Reagent-grade water is used in analytical, pharmaceutical, environmental, semiconductor, and research labs, wherever water quality affects results. It pairs with every titrant and buffer in Lab Pro's range, from Buffer Solution pH 7, Yellow to Sodium Hydroxide 0.1N\/M, 1 Gallon.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse; border:1px solid #cfcfcf; margin-bottom:28px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eDeionized water, reagent grade\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eCAS Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e7732-18-5\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eGrade\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eACS reagent; ASTM D1193 Type I\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eResistivity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e18 MΩ·cm (at point of production, 25 °C)\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eConductivity (Type I limit)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e0.056 µS\/cm max at 25 °C\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eTotal Organic Carbon (Type I, D1193-99)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e50 µg\/L max\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eSodium (Type I)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e1 µg\/L max\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eChloride (Type I)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e1 µg\/L max\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eTotal Silica (Type I)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e3 µg\/L max\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eAppearance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eClear, colorless, odorless liquid\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eNote\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eResistivity decreases after opening as CO2 dissolves\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eHazard Profile\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eNot hazardous\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003eDOT\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003eNot regulated\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left; width:32%; background:#f5f5f5;\"\u003e\u003cstrong\u003ePackage Sizes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #cfcfcf; padding:8px 12px; vertical-align:top; text-align:left;\"\u003e\u003cstrong\u003e1 gallon; 5 gallon; 55 gallon drum\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch4\u003eAvailable Variants\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZW0006-128:\u003c\/strong\u003e 1 gallon for benchtop reagent work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZW0006-640:\u003c\/strong\u003e 5 gallon for daily laboratory use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZW0006-999:\u003c\/strong\u003e 55-gallon drum for production and high-volume rinsing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eApplications \/ Common Uses\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard preparation:\u003c\/strong\u003e Prepares calibration standards and reagents.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrace analysis:\u003c\/strong\u003e Dilutes samples for ICP, IC, and HPLC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuffer and mobile phase preparation:\u003c\/strong\u003e Provides ion-free water for buffers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision rinsing:\u003c\/strong\u003e Rinses glassware and components without residues.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstrument supply:\u003c\/strong\u003e Feeds analyzers needing high-purity water.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStorage, Handling \u0026amp; Shipping\u003c\/h4\u003e\n\u003cp\u003eStore tightly closed at room temperature, away from chemical fumes and sources of contamination. Open containers only when needed, use clean dispensing equipment, and use opened water promptly, since it absorbs carbon dioxide and contaminants from the air.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncompatible materials:\u003c\/strong\u003e None (protect from contamination).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePersonal protection:\u003c\/strong\u003e Standard laboratory gloves to avoid contaminating the water.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpill response:\u003c\/strong\u003e Wipe up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFirst aid:\u003c\/strong\u003e Not required under normal use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eRelated Categories \u0026amp; Services\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eShop \u003ca href=\"https:\/\/labproinc.com\/pages\/buffers-standards-solutions\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eBuffers, Standards \u0026amp; Solutions\u003c\/a\u003e for related products in this category.\u003c\/li\u003e\n\u003cli\u003eExplore \u003ca href=\"https:\/\/labproinc.com\/collections\/general-chemistry\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eGeneral Chemistry\u003c\/a\u003e and \u003ca href=\"https:\/\/labproinc.com\/collections\/acs-grade-laboratory-chemicals\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eACS Grade Laboratory Chemicals\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/labproinc.com\/pages\/be-a-lab-pro-vmi-program\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eVendor Managed Inventory (VMI) Program\u003c\/a\u003e: Lab Pro can stock, track, and replenish this item on site so it never runs out. Contact info@labproinc.com or 888-452-2776 to set up a VMI assessment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eRelated Articles\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/labproinc.com\/blogs\/chemicals-and-solvents\/what-is-the-proper-deionized-water-conductivity-range\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eWhat Is The Proper Deionized Water Conductivity Range?\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/labproinc.com\/blogs\/chemicals-and-solvents\/the-importance-of-deionized-water-in-laboratory-applications\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eThe Importance of Deionized Water in Laboratory Applications\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/labproinc.com\/blogs\/chemicals-and-solvents\/deionized-vs-distilled-water-whats-the-difference\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eDeionized vs. Distilled Water: What's the Difference?\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lab Pro Inc","offers":[{"title":"1 Gallon","offer_id":47266341159061,"sku":"ZW0006-128","price":23.68,"currency_code":"USD","in_stock":true},{"title":"5 Gallon","offer_id":47266341191829,"sku":"ZW0006-640","price":49.21,"currency_code":"USD","in_stock":true},{"title":"55 Gallon Drum","offer_id":47266341224597,"sku":"ZW0006-999","price":552.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0757\/2327\/6437\/files\/Main_Image_480fa326-eae5-4684-8ab3-7e82cfd2dc5b.png?v=1791930701","url":"https:\/\/labproinc2.myshopify.com\/products\/water-deionized-d-i-18mohm-reagent-grade-acs-grade-type-i-1-gallon-5-gallon-55-gallon","provider":"Lab Pro Inc Plus","version":"1.0","type":"link"}