Molecular Sieve

The 3A Siliporite® Molecular Sieve beads are synthetic zeolite of the type 3A crystalline structure, in sodium form, having an effective pore opening of 3 Angstrom and produced as an off-white bead.

The 3A/13X Siliporite® Molecular Sieve beads are synthetic zeolite of the type X and A crystalline structure, in sodium potassium form.


  • High quality, so very low dew point is achieved
  • Negligible nitrogen adsorption resulting in the reduction of the deflection of the phenomena
  • Compatible with manufacturing gas filled insulating glass units
  • Consistent bead sizes
  • Low dust
  • The molecular sieves are supplied in a polyethylene liner enclosed in a re-sealable box or drum.
  • Available in the following sizes:
    • 55-pound (25 Kg) re-sealable box
    • 286-pound (130 Kg) drum
  • 3A Bead Products
    • 1.6 mm (10 x 14 beads)
    • 1.0 mm (16 x 20 beads)
    • 0.7 mm (20 x 40 beads)
  • 3A / 13X Bead Products
    • 1.6 mm (10 x 14 beads)
    • 0.7 mm (20 x 40 beads)

The 3A molecular sieves are used to remove water and prevent condensation within insulating glass units with metal spacers. They are excellent for use in dual seal units. Not recommended for use in single seal units made with sealants containing solvents, but excellent for all other single seal units manufactured with solvent-free sealants.

The 3A/13X molecular sieve bead blend provides both removal of water and solvent residues after sealing glass units with solvent based sealants.

Moisture Capacity at 50% RH (% Weight)
3A Bead -19-21
3A/13X Bead - 20-21
Particle Size
3A Bead - 1.6 mm; 1.0 mm; 0.7 mm
3A/13X Bead - 1.6 mm; 0.7 mm
Loss Ignition (% weight, 2 hrs. at 950º C) max
3A Bead - 1.5
3A/13X Bead - 2.5
*Minimum Temperature Rise, ºC
3A Bead - 29º (52.2º F)
3A/13X Bead - 29º (52.2º F)
*Test must be performed with an Atofi na/Ceca test kit available through
Quanex Customer Service.