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Recommended products

Recommended products for thickening and thixotropy in liquid resins
Unsaturated polyester resins are relatively non polar, as in most cases the reactive diluent styrene is used. For this reason, hydrophilic AEROSIL® fumed silica is the thickening agent of choice. AEROSIL® 200 is widely used for laminating resins and gel coats. Nowadays the more efficient product AEROSIL® 200 HV is recommended.
Some specialty polyester resins and vinyl ester resins, which have more polar character, require hydrophobic AEROSIL® products. AEROSIL® R 202 performs excellent in such formulation, while hydrophilic AEROSIL® fumed silica will not give sufficient thickening efficiency.
The following table shows the typical applications and effects for the use of AEROSIL® and SIPERNAT® products in UP resins and gives recommendations for grades and dosage.
Gel coat
Application
Effect
Product
Dosage
[wt.%]
Remark
Clear
Rheology
AEROSIL®
200 /
AEROSIL®
200 HV
1.0-2.0
 
Filled/ colored
w/talc, TiO2 etc.
Rheology
Porosity
AEROSIL®
200 /
AEROSIL®
200 HV
SIPERNAT®
22 LS
2.5-4.5
Ratio 40 percent
(AEROSIL®
200) with 60 percent (SIPERNAT®
22 LS) to start. Similar usage in putties and pastes
Dark colored
non-white
Rheology
Blush Resistance
AEROSIL®
200 /
AEROSIL®
200 HV
SIPERNAT®
FPS-5
2.5-4.5
For marine gel coat
High purity ppt. silica
General
Rheology control
Mechanical properties
AEROSIL®
R 202, AEROSIL®
R 208
6.0-10.0
In most cases based on VE and EP resin. When UP resin is used AEROSIL®
200 HV is recommended
Laminating resin
Application
Effect
Product
Dosage
[wt.%]
Remark
General
Rheology control
AEROSIL®
200 /
AEROSIL®
200 HV
0.8-1.3
 
Low styrene
Rheology control
AEROSIL®
200 /
AEROSIL®
200 HV
SIPERNAT®
22 LS
0.8-2.5
For environmental resins
Rising viscosity with less solvent
General
Rheology control
Mechanical properties
AEROSIL®
R 202, AEROSIL®
R 208
6.0-10.0
In most cases based on VE and EP resin. When UP resin is used AEROSIL®
200 HV is recommended
Bonding paste
Application
Effect
Product
Dosage
[wt.%]
Remark
General
Rheology control
Mechanical properties
AEROSIL®
R 202, AEROSIL®
R 208
6.0-10.0
In most cases based on VE and EP resin. When UP resin is used AEROSIL®
200 HV is recommended
The data represents typical values