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IMSIL® A-25 is a microcrystalline silica filler that is produced from an inert, naturally occurring alpha quartz with a unique grape-like morphology. Easily wetted and dispersed in either solvent or water-based systems, IMSIL® is selected for its excellent tint retention, durability over prolonged exposure, and resistance to dirt and weathering.

Chemical Family: Silica

Functions: Filler

End Uses: Primer, Solventborne Coating, Waterborne Coating

Particle Size: 5.0 - 5.0 microns

Oil Absorption: 28.0 - 28.0 g/100 g

Knowde Enhanced TDS

Identification & Functionality

Chemical Family
CASE Ingredients Functions
Technologies

Features & Benefits

IMSIL® Features and Benefits
  • Interior architectural paints formulated with IMSIL® will exhibit strengthened film integrity, increased stain resistance, more uniform sheen control, and excellent “touch-up” characteristics.
  • Gloss control, superior chemical resistance, inter-coat adhesion, and color and gloss retention over prolonged exposure.
  • Low oil absorption, regardless of particle size, enables formulators to increase loading without adversely affecting critical film properties.
  • Exterior coatings containing IMSIL® will better resist weathering, chalking, and under eave frosting.
  • When used in primers, IMSIL® also provides the “tooth” necessary for better intercoat adhesion and greater durability in abrasive or corrosive environments.
  • IMSIL® has been proven effective in trade sales paints, OEM finishes, marine and industrial coatings, and potting compounds.
  • Finer, micronized grades are useful in formulating higher gloss paints, and systems requiring controlled mineral top size, such as industrial OEM topcoat coats and non-conductive inks.
  • Intermediate size grades offer ideal and uniform gloss control for topcoats, coil coats and increased inter-coat adhesion between primers and topcoats.
  • Coarser grades offer texture, traction properties, gloss control, and abrasion resistance in coatings, grouts, sealants, and related building products.
  • All IMSIL® grades are processed with rigid adherence to Covia QIPSM statistical and quality assurance programs. The result is chemical purity and consistently uniform particle size distributions for predictable results and reliable service.

Applications & Uses

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Median Particle Size5.0μm
Surface Area5.3m²/g
Brightness85.5TAPPI
Oil Absorption28.0g/100g
Moisture Content0.18%
Density22.07lbs/gallonASTM D-153
Bulking Value0.0453ASTM C-29
Specific Gravity2.65g/cm³ASTM C-128
pH6.6AFS 113-87-S
Refractive Index1.54 - 1.55ASTM D-801
Hardness6.5Mohs
Particle Size Distribution
ValueUnitsTest Method / Conditions
Particle Size (Retained on 45 microns)100.0%
Particle Size (Retained on 38 microns)99.9%
Particle Size (Retained on 25 microns)99.8%
Particle Size (Retained on 15 microns)90.4%
Particle Size (Retained on 10 microns)76.7%
Particle Size (Retained on 8 microns)72.6%
Particle Size (Retained on 5 microns)51.2%
Chemical Analysis
ValueUnitsTest Method / Conditions
Silicon Dioxide98.89Mean % by weight
Iron Oxide0.07Mean % by weight
Aluminum Oxide0.47Mean % by weight
Calcium Oxide0.03Mean % by weight
Titanium Dioxide0.02Mean % by weight
Magnesium Oxide0.02Mean % by weight
Potassium Oxide0.05Mean % by weight
Sodium Oxide0.01Mean % by weight
Loss on Ignition0.44Mean % by weight

Regulatory & Compliance

Certifications & Compliance

Packaging & Availability

Country Availability
Packaging Type
Regional Availability
  • Canada
  • USA
Packaging Information

Bulk, IBC and 50 lb Paper Bag