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Optifil® T is a treated 1.7 micron surface-treated calcium carbonate produced in Quincy, IL containing an extremely low level of crystalline silica content for paints, coatings, adhesives, caulks and sealants applications.

Functions: Filler

Chemical Family: Calcium Salts, Carbonates, Kaolins

Compatible Polymers & Resins: Cellulose & Cellulosics, Epoxies (EP), Polyesters, Polyolefins, Polyurethanes (PU), Polyvinyl Chloride (PVC), Silicones

Particle Size: 1.7 - 1.7 microns

Oil Absorption: 17.0 - 17.0 g/100 g

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Knowde Enhanced TDS

Identification & Functionality

Chemical Name
CASE Ingredients Functions
CAS No.
471-34-1
EC No.
207-439-9
Technologies

Features & Benefits

Labeling Claims
CASE Ingredients Features
Product Highlights
  • Ultra-fine particle distribution 
  • High surface area 
  • Round particle shape
  • Low silica content 

Applications & Uses

Properties

Physical Form
Chemical Properties
ValueUnitsTest Method / Conditions
Calcium Carbonate99.3%
Magnesium Carbonate0.4%
Silica and Silicates0.05%
Other0.2%
Physical Properties
ValueUnitsTest Method / Conditions
Acid Solubility (in HCl)99.8%
Brightness (Hunter reflectance)93.0%
Compacted Bulk Density70lb/ft³ASTM C110
Loose Bulk Density50lb/ft³ASTM C110
Mesh size (+325) (45μm)0.005%
Median Particle Size (Sedigraph®)1.7μ
OIl Absorption17.0lbs oil / 100lbsASTM D281
Hegman Grind6.5ASTM D1210
Moisture0.2%ASTM D280
Typical Properties
ValueUnitsTest Method / Conditions
Specific Gravity2.7ASTM D153
ColorWhite
pH (Saturated Solution)9.4ASTM D1208
Mineral Properties
ValueUnitsTest Method / Conditions
Hardness (Mohs)3
Linear Expansion Coefficient4.3 x 10^-6°C
Solubility (H₂O, 100°C)0.0035g/100ml
Weight per Gallon (s.g. x 8.345)22.6lbs
Particle Shape (Microscope)Irregular, uniaxial
Refractive Index (Hand. Of Chem. & Phy)1.6
Alkalinity (as NaOH)0.4mg/gmASTM D1208