MATERIAL
SCIENCE
INQUIRE
ELEMENT 55 · GROUP 1 · PERIOD 6

Cesium Metal Cs ≥99.995%

YS/T 1245-2018 CAS 7440-46-2 UN 1407 Class 4.3 PG I Golden Crystalline Phase
Cesium Metal Quartz Viewport 01 · Golden Crystal View-Port
AUTHENTICATED ICP-MS SCAN (正本) Standard YS/T 1245-2018 · Lot CS-4N5 Active
COA PDF [PDF] Compliance Dossier [PDF]

Elemental cesium metal conforming to YS/T 1245-2018. Renowned for its low melting point (28.5°C) and supreme electropositive reactivity. Essential for atomic clock frequency standards, magnetometers, and specialized photoelectric cathodes. Shipped in dedicated Swagelok-equipped cylinders or sealed ampoules.

Purity Grade ≥99.995% (4N5)
Total Impurities <50 ppm Metallic Sum
Physical Constants m.p. 28.5°C · 1.93 g/cm³
Supply Formats 5kg SS Canister / 5g–100g Ampoule
MOQ & Dispatch 500g+ / Bulk (5–7 Days)
Commercial Settlement 50/50 T/T Pre-Ship SGS Inspection
STEP 01 · CONTAINMENT
Quartz Viewport Canister

316 SS cylinder with integrated optical quartz viewport to inspect golden crystallization without breaching seal.

STEP 02 · ATMOSPHERE
Argon Overpressure

Pressurized under 99.999% dry argon (zero oxygen / zero moisture contamination).

STEP 03 · ARMORING
UN Flight Case

Riveted tamper-evident flight case certified for UN 1407 Class 4.3 PG I hazardous air/sea cargo.

Cs≥99.995%
Rb<20 ppm
K3.0 ppm
Na1.5 ppm
Mg<1.0 ppm
Pb<1.0 ppm
Al<1.0 ppm
Fe<1.0 ppm
Direct Refinery Allocation Pre-contract factory site visits hosted for institutional buyers · Quoted by formal FCO
Inquire about Cesium
Cross-section: two stainless tanks seated in the foam pockets of an aluminum flight case
ENGINEERED TO ARRIVE

Three layers between the metal and the road.

  1. 1
    The tank316 stainless steel with a wall thicker than 2 mm. Every tank is helium leak-tested before it ships.
  2. 2
    The foamA laser-cut EVA insert gives each tank its own deep pocket, so the tank stands upright and metal never touches metal.
  3. 3
    The caseA riveted aluminum shell with latches, orientation labels and UN Class 4.3 marking for dangerous-when-wet cargo.
> 2 mmtank wall, 316 stainless steel
< 10−11helium leak rate, mass-spectrometer tested
0.4 MPaworking pressure
5 kgof cesium in each tank
320 mmoverall height, 160 mm base
29 kggross weight of a loaded case: two tanks, 10 kg of metal

Tank figures are from the supplier packing specification for the 5 kg cesium tank. Case weight is from the shipping label of a rubidium case. Illustration, not a photograph.

PACKAGING IN PRACTICE

Sealed, cushioned, labelled.

Each 5 kg stainless tank travels in its own foam-cut flight case. The tank, the insert and the outer case, as they leave the warehouse.

5 kg 316 stainless steel tank with valves and sight glasses
5 kg tank316 stainless steel, needle valves, quick couplers, sight glasses
Flight case with foam insert cut for two tanks
Foam-cut flight caseCushioned pockets hold two tanks upright
Closed aluminum flight cases with handling labels
Outer caseRiveted aluminum shell with orientation and caution labels
ON CAMERA

See it before you inspect it.

Phone footage from the warehouse: tanks seen from above, and the view through the sight glass. Trimmed, with the sound removed.

Tanks in storageA walk over the stock, then sight-glass views
Close look at a tankClamp, valves and the sight glass up close
Inside a flight caseTwo 5 kg tanks in their foam pockets, then the sight glasses up close. A rubidium case, 10 kg of metal.
GOVERNMENT HAZMAT & ICP-MS LABORATORY CERTIFICATES

Verified Scans & Regulatory Dossier (正本)

Inspect authentic Chinese refinery test reports (YS/T 1246-2018 / YS/T 1245-2018), PRC Dangerous Goods Production Licenses, and Hong Kong bonded warehouse compliance records.

LAB REPORT · 2-PAGE COA Rubidium ICP-MS Assay Standard YS/T 1246-2018 · JC-ICP-03 LAB REPORT · 2-PAGE COA Cesium ICP-MS Assay Standard YS/T 1245-2018 · Lot CS-4N5 BONDED STOCK · LAB REPORT Isotope Copper 5N8 GOST 859 / 5N8 · Oxygen <1 ppm ↗ PRC HAZMAT LICENSE Safety Production Dossier 2026–2029 PRC DG License (金属铷/金属铯)

Supplier details are redacted to protect the refinery. Unredacted originals are provided to qualified buyers under NDA.

INSTITUTIONAL INQUIRY DESK

Request Formal Offer & COA

Direct communication with our commercial desk. Qualified institutional buyers receive an itemized Full Corporate Offer (FCO), comprehensive COA pack, and factory inspection protocols within 24 hours.

Rubidium and cesium: buyers are welcome to visit the manufacturing site in China to verify inventory and request samples for testing. Samples are provided on site only and are not shipped internationally. A prior agreement and prerequisites apply. Copper powder can be inspected and sampled at our Hong Kong bonded warehouse.

Standard terms: 50/50 T/T · SGS inspection