Page 63 - Handbook of Surface Improvement and Modification

58 Surface Matting (Flattening)

Silicon dioxide

GENERAL INFORMATION
Name: silicon dioxide CAS #: 7631-86-9, 14807-96-6, Solids content, wt%: 100
50-00-0
Product composition: silicon dioxide, chemically prepared; talc, <0.05% formaldehyde
PHYSICAL PROPERTIES
State: solid fine powder Odor: characteristic Color: white
Oil absorption, g/100 g Palatinol N: 182-238 Particle size, μm: 50-90
3
Volatility, %: 0 Density, kg/m : 1600-1900
HEALTH & SAFETY
o
Autoignition, C: >370
Carcinogenic: NTP: None of the ingredients is listed; IARC: Group 3: silicon dioxide, chemically
prepared, Group 2B: Talc; OSHA: None of the ingredients are listed
OSHA, PEL, ppm: 20 mppcf (containing <1% quartz)/talc
USE & PERFORMANCE
Outstanding properties: Reduces the gloss and at a higher dosage, the viscosity will only be
slightly increased. Good flow and processability remain and allow for all usual application pro-
cesses. Shows very good resistance regarding burnishing and mar resistance. Imparts coatings a
soft touch and good wetting properties. Offers good matting effect, high scratch and polishing
resistance, chemical resistance, increases resistance to metal marking, temperature resistant up to
o
o
200 C, short-term curing temperatures up to over 300 C, good gloss retention under weathering,
highly transparent in film, can be overpainted and printed on.
Recommended for polymers: acrylics and acrylic copolymers, epoxies, PU
Recommended for products: Recommended as a matting agent for use in solvent-based 2-compo-
nent systems (polyurethane or epoxy-resin lacquers). Beyond that, the product is also suitable for
other air- and oven-drying systems. It does not contain any wax additives, thus coating layers
equipped with it are not expected to cause any adhesion problems in multi-layer systems or repair
coatings.
Concentrations used, wt%: 1-10