Oil-Well Cement (API Class G & Class H, HSR / MSR)

API Spec 10A Class G and H well cement, HSR and MSR, from monogram-licensed plants for cementing companies and drilling contractors

Oil-well cement is a Portland cement ground to API Specification 10A, the standard that also defines the slurry tests a cementing company relies on when it pumps a casing job. Classes G and H are the basic well cements: produced by grinding clinker with no additive other than calcium sulphate, water or a chromium (VI) reducer, and intended to be used with accelerators and retarders across a wide range of well depths and temperatures. The specification fixes the chemistry for both classes: MgO ≤ 6.0%, SO₃ ≤ 3.0%, loss on ignition ≤ 3.0%, insoluble residue ≤ 0.75%, C₃S between 48% and 65%; the high-sulphate-resistant (HSR) grade caps C₃A at 3.0% with C₄AF + 2C₃A ≤ 24%, and the moderate-sulphate-resistant (MSR) grade allows more C₃A. The physical tests are what the buyer actually pays for: free fluid ≤ 5.9% on the standard slurry, compressive strength of at least 300 psi (2.1 MPa) after eight hours at 38 °C and 1,500 psi (10.3 MPa) after eight hours at 60 °C, and a thickening time of 90–120 minutes to 100 Bc on the Schedule 5 test. Class G has the finer grind and is mixed at 44% water; Class H is ground coarser and mixed at 38%, and is the US Gulf Coast cement; most markets outside North America specify Class G HSR. A plant that carries the API monogram is audited to the quality programme behind the specification, and the mill certificate for each lot reports the chemistry, the slurry tests and the licence number.

Customs subheading 2523.29 covers all grey Portland cement, so well cement sits inside the ordinary cement trade in the statistics: UN Comtrade 2024 export declarations under HS 2523.29 total about USD 6.7 billion and 72 million MT, with Türkiye the largest reporter at 13.6 million MT and Egypt at 3.1 million MT, and Malaysia (1.04 million MT) and India (505,000 MT) also declaring; the plants that grind Class G do so alongside construction cement, so the origin list follows the grey-cement exporters. The buyers are cementing service companies and their bulk plants, drilling contractors and operators' supply-chain departments; for CBIL those are the oilfield bases in Oman (Sohar, Duqm), the Fujairah side of the UAE, West Africa (Nigeria, Ghana, Côte d'Ivoire, Angola, Senegal) and Southeast Asia (Malaysia, Indonesia, Thailand, Vietnam), and the traders who hold stock for them. CBIL is a commodity brokerage company and brokers Class G and Class H cement from monogram-licensed plants to those buyers against the plant's API mill certificate for the lot, a third-party SGS, Bureau Veritas or Intertek sampling and slurry test where the buyer requires it, a certificate of origin and a safety data sheet, packed in 1.5 MT jumbo bags, 2 MT sling bags of 50 kg sacks, or bulk in cement carriers and pneumatic containers, kept dry, on FOB, CFR and CIF terms. Cement under HS 2523 is on the EU CBAM Annex I list, so an EU importer needs embedded-emissions data from the plant. Price is agreed per MT on class, grade and pack. Send the class and grade (G HSR is the usual ask), the slurry tests you want witnessed, the monthly or campaign tonnage, pack and discharge port, and the enquiry is screened and worked against it.

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Excluded origins are not offered, including product re-exported, blended or re-processed through a third country. Every lot moves with a certificate of origin naming the producing plant, mine or grower country, and nothing is quoted before the seller and loading point are known.