Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Chemical Name
- Plastics & Elastomers Functions
- CAS No.
- 7778-18-9
- EC No.
- 231-900-3
- Technologies
Features & Benefits
- Labeling Claims
- Materials Features
- Features
- High purity, whiteness
- Soft, low abrasion
- Resistance to weak acids
- Improved UV resistance
- Excellent impact properties
- Good processibility
- Excellent Dielectric properties
- Lower specific gravity than barium sulfate
- Resistance to mild acids
- Good electrical properties
- Cost savings potential
Applications & Uses
- Applications
- Plastics & Elastomers End Uses
- Applications
CAS-20-4 filler is ideal for many rigid PVC applications, including:
- Vinyl siding
- Window frames
- Moldings
- Conduit
- Pipe
Properties
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Specific Gravity | 3 | - | - |
| pH-10% Slurry | 10.8 | - | - |
| Mohs Hardness | 2-3 | - | - |
| Refractive Index | 1.6 | - | - |
| Dielectric Constant | 5.6 | - | - |
| Oil Absorption | 24-26 | - | - |
| Loose Bulk Density | 45 | lbs./ft.3 | - |
| Packed Bulk Density | 65 | lbs./ft.3 | - |
| L | 95.4 | - | - |
| a | 0.5 | - | - |
| b | 1.9 | - | - |
| Median Particle Size | 4.6 | microns | - |
| Top Particle Size | 26 | microns | - |
| Calcium Sulphate (CaSO4) | 98.7 | - | - |
| CaCO3.MgCO3 | 0.5 | - | - |
| Calcium Carbonate (CaCO3) | 0.3 | - | - |
| Aggregate | 0.3 | - | - |
| Free Moisture at 113 °F (45 °C) | 0.1 | - | - |
| Combined Moisture at 437 °F (225 °C) | 0.2 | - | - |
| Blaine Surface Area | 10000-14000 | cm2/g | - |
Regulatory & Compliance
- Certifications & Compliance
- Regulatory Information
Country Standard Information USA FDA Title 21, Volume 3, Part 184 Anhydrous Calcium Sulfate is recognized as Generally Recognized As Safe (GRAS). Europe EU 10/2011 Anhydrous Calcium Sulfate is included in Article 6, section 3(a) (Page 16) as a Calcium Salt of Sulphuric Acid, which is listed as an authorized acid under FCM substance number 511 in ANNEX I (page 68). China China GB 9685 Anhydrous Calcium Sulfate (CAS 7778-18-9) is listed as an acceptable additive on page 172 of standard. France French Positive List Calcium Sulfate is allowed and listed under the Group C minerals section (page 240) of the French Positive List (Circulaire No 176 of 2 December 1959 and amendments).
Technical Details & Test Data
- Typical Particle Size Data
Microtrac Analysis % Passing 26 microns 100.0 11 microns 94.0 5.5 microns 68.0 4.62 microns (median) 58.0 1.945 microns 14.0 0.972 micron 3.0 - Product Comparison
TEST 1
Capstock tests indicate that calcium sulfate can provide equivalent or better properties than higher priced calcium carbonates.This test was conducted on four vinyl siding capstock formulations. #1 and #2 contained calcium carbonate and #3 and #4 contained calcium sulfate (CAS-20-4). All other additives were held constant. Dry blends were prepared by Vista Chemical. 7"*45 mil profiles were processed by a major vinyl siding manufacturer on a 40 mm American Maplan twin-screw extruder. Formulations and test results were as follows.
Brand Name 10 phr CaCO3 #1 15 phr CaCO3 #2 10 phr CaSO4 #3 15 phr CaSO4 #4 Function Composition Supplier Vista 5385 100 100 100 100 PVC resin 0.92 IV homopolymer Vista Chemical TM181 1.5 1.5 1.5 1.5 Thermal stabilizer Tin mercaptide Morton International Extra-Dense G 1.2 1.2 1.2 1.2 Lubricant Calcium stearate Witco Corp. Rheolub 165-010 1.2 1.2 1.2 1.2 Lubricant Paraffin wax Rheochem Mfg. Co. AC629A 0.2 0.2 0.2 0.2 Lubricant Polyethylene wax Allied Signal Inc. K12ON 1 1 1 1 Processing aid Acrylic copolymer Rohm & Haas Co. KM334 6 6 6 6 Impact modifier Acrylic copolymer Rohm & Haas Co. Omyacarb® UFT 10 15 - - Filler Calcium carbonate Omya Inc. CAS-20-4 - - 10 15 Filler Calcium sulfate U.S. Gypsum Co. CR834 10 10 10 10 White pigment Titanium dioxide Kerr McGee RESULTS
ASTM D638 10 phr CaCO3 #1 15 phr CaCO3 #2 10 phr CaSO4 #3 15 phr CaSO4 #4 Tensile Strength at Yield, psi 6,390 6,180 6,270 6,070 Tensile Strength at Yield, kPa 44,060 42,610 43,230 41,850 Tensile Modulus * 10^5, psi 4.35 4.89 3.81 4.46 Tensile Modulus * 10^6, kPa 3.00 3.37 2.62 3.07 Elongation at Yield, % 2.9 3.0 3.4 3.0 ASTM D3029 10 phr CaCO3 #1 15 phr CaCO3 #2 10 phr CaSO4 #3 15 phr CaSO4 #4 Falling Weight Impact, in.-lb. 87.0 75.2 102.7 71.2 Falling Weight Impact, J 9.8 8.5 11.6 8.0 Capstock tests indicate that calcium sulfate can provide equivalent or better properties than calcium carbonate.
TEST 2
This independent study was conducted on two typical vinyl siding substrate formulations, one containing 8 phr of calcium carbonate and one containing 8 phr of calcium sulfate (CAS-20-4). Dry blends were prepared on site by a vinyl siding manufacturer. All other additives were held constant. Profiles, measuring 7"*40 mil, were processed on a 40 mm American Maplan twin-screw extruder.
ASTM D638 8 phr CaCO3 (OMYACARB® UFT) #1 8 phr CaSO4 (CAS-20-4) #2 Tensile strength at yield, psi 6,750 6,810 Tensile strength at yield, kPa 46,540 46,950 Tensile modulus * 10^5, psi 3.45 4.46 Tensile modulus * 10^6 , kPa 2.38 3.07 Elongation at yield, % 3.9 3.8 ASTM D3029 8 phr CaCO3 (OMYACARB® UFT) #1 8 phr CaSO4 (CAS-20-4) #2 Falling Weight Impact, in.-lb. 102.7 100.0 Falling Weight Impact, J 11.6 11.3 Substrate tests demonstrate that, at comparable loading levels, CAS-20-4 can provide significantly higher modulus and equivalent impact strength versus ultrafine treated carbonate.
- Particle Size Distribution
Volume (Microtrac) Cumulative % Passing Weight (Sedigraph) % Smaller Than 20 microns 100.0 20 microns 100.0 10 microns 87.0 10 microns 92.3 5 microns 55.5 5 microns 68.4 4.3 microns (median) 50.0 3.5 microns (median) 50.0 2 microns 22.0 2 microns 30.1 1 micron 8.9 1 micron 4.1
Packaging & Availability
- Packaging Type
Storage & Handling
- Storage & Use
When properly used, USG CAS-20-4 Anhydrous Calcium Sulfate Filler is easy to work with. Keep indoors at temperatures between 65 °F – 75 °F (18 °C – 24 °C) and 45% – 55% RH. Do not stack more than two pallets high. Keep from drafts. Rotate stock. USG CAS-20-4 Anhydrous Calcium Sulfate Filler should be used within one year of the manufacturing date located on the package. Always follow handling and use directions and safety warnings on the package.