Bulk Gypsum Supplier & Exporter — Raw Rock, Plaster and Crystal Grades

CaSO₄·2H₂O Raw Gypsum · up to 99% CaSO₄·½H₂O Gypsum Plaster · 100 & 200 mesh

Raiva International Trading Group supplies natural gypsum from long-established Iranian deposits to cement plants, plasterboard producers and agricultural buyers worldwide. Choose raw gypsum rock for cement retardation, calcined gypsum plaster for boards and finishes, or high-clarity crystal gypsum — shipped in bulk, jumbo bags or 25 kg PP bags with a batch-specific Certificate of Analysis.

Request a Bulk Gypsum Quote Packaging & Incoterms

25 MT

MOQ — bagged (1 × 20ft)

500 MT

MOQ — bulk vessel

7–14 days

Lead time, standard grades

Per batch

Certificate of Analysis

Our Gypsum Product Range

Three product families, eight standard grades. Open a product for its full chemical and physical analysis and test methods.

Raw gypsum rock (CaSO4.2H2O) for cement retardation — B2B bulk export supplier — Raivaco

CaSO₄·2H₂O

Gypsum Rock · Purity 88 – 99%

Raw Gypsum (Gypsum Rock)

Run-of-mine and selected gypsum rock for cement set retardation, plaster calcination and agricultural soil conditioning — from 88% cement grade up to 99% premium white.

Raw gypsum specifications & grades

Gypsum plaster powder (stucco, calcium sulfate hemihydrate) 100 and 200 mesh — B2B bulk export supplier — Raivaco

100 / 200 Mesh

Calcined Plaster · CaSO₄ > 90%

Gypsum Plaster (Stucco)

Calcined building plaster in 100 mesh base coat and 200 mesh super-micronized finish grades, tested to BS EN 13279-2 and ASTM C471-M-20 for setting time, strength and whiteness.

Gypsum plaster specifications & grades

Selenite

Crystalline · Uncalcined Dihydrate

Crystal Gypsum (Selenite)

Transparent laminated selenite and fibrous satin spar, the highest-purity form of natural gypsum, for food, pharmaceutical, agricultural and decorative use.

Crystal gypsum specifications

Which Gypsum Product Do You Need?

All three are calcium sulfate, but the state of hydration and the processing decide what each one can do.

Comparison of raw gypsum, gypsum plaster and crystal gypsum properties
Property	Raw Gypsum	Gypsum Plaster	Crystal Gypsum
Chemical formula	CaSO₄·2H₂O	CaSO₄·½H₂O	CaSO₄·2H₂O
Purity range	88 – 99%	> 90% CaSO₄	Certified per batch
Form	Lump, 0–50 mm	Powder, 100 / 200 mesh	Transparent crystal sheets
Processing	Crushed and screened	Calcined at 150–180 °C	Hand-selected, uncalcined
Sets with water	No — already hydrated	Yes — 6–12 min initial set	No — already hydrated
Typical uses	Cement retarder, soil conditioner, plaster feedstock	Plasterboard, wall finishes, moulds, prefabricated walls	Food and pharmaceutical calcium, agriculture, decorative
Full specifications	Raw grades	Plaster grades	Crystal grades

Bespoke Production

Need a different specification?

If none of our standard gypsum grades matches your target purity, size or packaging, send us your requirements — we supply to your exact specification.

Request a Custom Grade All Products

Logistics & Trading Terms

The commercial terms we work to on every gypsum shipment. Anything here can be adjusted by agreement — tell us what your operation needs.

Minimum Order Quantity: 1 × 20 ft container (approx. 25 MT) bagged. 500 MT minimum for bulk vessel. Trial quantities available for qualification.
Packaging: Raw rock in bulk or 1–1.5 MT jumbo bags; plaster in 25 kg 3-ply laminated PP bags or jumbo bags. Moisture-proof PE lining available on request.
Incoterms & Loading Ports: EXW, FOB, CFR and CIF (Incoterms® 2020). Standard loading at Bandar Abbas and Bandar Imam Khomeini; other ports by arrangement.
Quality Certification: Batch-specific CoA with every shipment covering purity as CaSO₄·2H₂O, combined water, SO₃ and oxide impurities. SGS / Bureau Veritas inspection at buyer’s cost.
Lead Time: 7–14 days for standard grades after order confirmation; 15–25 days for custom-milled or specially packed material.
Storage & Handling: Store dry and covered. Gypsum is stable but hygroscopic in powder form — keep plaster bags sealed and off the ground, as absorbed moisture starts pre-hydration and shortens working time.

Certificate of Analysis

A batch-specific CoA is issued with every shipment. Third-party inspection by SGS, Bureau Veritas or an inspector of your choice can be arranged at the buyer’s cost.

Ready to quote

Send us your grade, tonnage, destination port and packaging and we will return a firm FOB/CFR/CIF price with lead time.

Request a Gypsum Quote

Frequently Asked Questions

Common questions from industrial buyers sourcing gypsum in bulk.

What is the minimum order quantity for gypsum?

Our standard MOQ is one 20 ft container (approximately 25 MT) for bagged material. For bulk vessel shipments the minimum is 500 MT. Trial and sample quantities can be arranged so you can qualify the material before committing to a full order.

Which Incoterms do you trade gypsum under?

We quote EXW, FOB, CFR and CIF under Incoterms® 2020. Most export orders ship FOB Bandar Abbas or FOB Bandar Imam Khomeini, with CFR and CIF available to most destination ports on request.

Do you issue a Certificate of Analysis (CoA)?

Yes. A batch-specific Certificate of Analysis accompanies every shipment, covering purity as CaSO₄·2H₂O, combined water, SO₃, CaO and oxide impurities, tested to ASTM C471-M-20. Third-party inspection by SGS, Bureau Veritas or an inspector of your choice can be arranged at the buyer’s cost.

Gypsum purity varies between mine faces — how do you handle that?

It does, and we would rather say so than publish a single number. Purity in a natural deposit shifts with the working face and with each blast, so we work from a current sample analysis rather than an old certificate. For large tonnages buyers are welcome to visit the mine, take their own sample and have it independently tested before contracting.

What is the difference between raw gypsum and gypsum plaster?

Raw gypsum is calcium sulfate dihydrate (CaSO₄·2H₂O) straight from the mine, crushed and screened. Gypsum plaster is the same mineral calcined at roughly 150–180 °C, which drives off three quarters of the chemically bound water and leaves the hemihydrate (CaSO₄·½H₂O). Add water back and it sets. See the raw gypsum grades and plaster grades for full analyses.

What is the lead time for a gypsum order?

Standard grades ship within 7 to 14 days of order confirmation. Custom-milled or specially packed grades typically require 15 to 25 days depending on volume and destination port.