USAC Antimony Oxide Types

“MICROPURE” ANTIMONY OXIDE (MP) – The particle size of MP is typically 0.80 to 1.1 microns. It has a fine particle size and a very high tint strength and is preferred in many applications such as the enameling of cast iron.

“HIGH TINT” ANTIMONY OXIDE (HT) – HT is the industry standard antimony oxide, and it has a particle size of 1.1 to 1.8 microns. The product is used in most applications.

“LOW TINT” ANTIMONY OXIDE (LT) – LT is a mixture of senarmontite, and typically more than 3% valentinite with an average particle size of 1.8 to 3.0 microns. It is used where a low tint strength is desirable to reduce the cost of pigments.

LOW DUST ANTIMONY OXIDE PRODUCTS – VP, MP, HT, and L T antimony oxide are offered in several different ways to minimize dust:

  • Wetted Antimony Oxide – Montana Brand antimony oxides are “wetted” to reduce dust formation typically with 3 to 4% diisodecyl phthalate (OIOP).
  • Bulk Tank Trucks – Antimony oxide is also sold in pneumatic discharge tank trucks (PO’s) with capacities up to 48,000 pounds. The PO’s can be discharged directly into silos to reduce handling.
  • Bulk bags– Antimony oxide in 2,000 or 2204.5 pound bulk bag is also sold to reduce dusting. They can be discharged directly into materials handling equipment or silos.
    • Paper Bags – Antimony oxide in 50 pound or 55.1 pound paper bags.


Antimony Oxideminimum99.7%99.7%99.7%99.7%99.7%99.7%
Antimony (Sb)minimum83.3%83.3%83.3%83.3%83.3%83.3%
Arsenic (As)maximum0.3%0.050%0.3%0.050%0.3%0.050%
Lead (Pb)maximum0.2%0.075%0.2%0.075%0.2%0.075%
Iron (Fe)maximum 0.002%<0.0004%0.002%<0.0004%0.002%<0.0004%
Selenium (Se)maximum50 ppm<50 ppm50 ppm<50 ppm50 ppm<50 ppm
Specific Gravity5.6 to 5.75.2 to 5.65.6 to 5.75.2 to 5.65.6 to 5.75.2 to 5.6
Tint Strengthhighhighlow
Average Particle Size FSSS (Microns)0.8 to 1.10.8 to 0.951.1 to 1.81.2 to 1.61.8 to 3.02.1 to 2.5
ColorExcel. WhiteExcel. WhiteExcel. White
Residue on 325 mesh  % max./min.0.5%<0.1%0.5%<0.1%0.5%<0.1%
Weight per cubic ft. approx.45-55#45-55#45-55#