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SYLOBLOC® 41 is a silica antiblocking agent with intermediate pore volume and a very large particle size. It offers great optical properties in thick films.
SYLOBLOC® 41 is a synthetic amorphous silica (silicon dioxide) antiblocking agent supplied as a free-flowing powder with intermediate pore volume and the largest particle size among the SYLOBLOC® series. The intermediate pore volume of SYLOBLOC® 41 provides versatility in the types of films it can be used in, where single-layer polypropylene (PP) and polyethylene (PE) and slurry-processed polyethylene terephthalate (PET) are typical options. SYLOBLOC® 41 may also be used as a matting and surface-texturing agent for calendered PVC films and sheets. It can even be used as an anti-plate-out aid. SYLOBLOC® 41 exhibits a low refractive index and, therefore, is characterized with excellent optical properties, as it pertains to preserving the visual clarity and quality of films it is used in. Since SYLOBLOC® 41 is a manufactured silica product, it contains very few impurities that contribute to degradation in film quality and provides antiblocking effectiveness with efficiency. SYLOBLOC® 41 is typically used in plastic films with thicknesses greater than 70 µm. Films using SYLOBLOC® 41 are used in common applications that include heavy-duty industrial and food packaging films. In addition to its use as an antiblocking aid for plastic films, SYLOBLOC® 41 may also be used as an additive in coating formulations to reduce blocking.
Moisture at 160°C, % max: 1.5
Average particle size via Malvern Mastersizer, µm: 8.0–11.9
Wet screen residue > 71 µm, max %: 0.03
pH of 5% aqueous suspension: 6.0–8.0
Primary Chemistry: Synthetic amorphous silica
Intermediate pore volume
Very large particle size
High antiblocking performance
Easy to disperse
Excellent optical properties
Blocking of films during storage, processing, and transport
Poor optical properties of transparent films using antiblocking agents
Issues with dispersion of antiblocking agents
Plating out of PVC films
Food packaging films
Industrial films
PVC plastisol coatings
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