In-Depth Introduction to Hydrophobic Fumed Silica Grades R972, R974, and H18 and Their Downstream Applications

创建于04.22

In-Depth Introduction to Hydrophobic Fumed Silica Grades R972, R974, and H18 and Their Downstream Applications

Gradi	R972 (Evonik)	R974 (Evonik)	H18 (Wacker)
Kemikali Igama	Hydrophobic Fumed Silica	Hydrophobic Fumed Silica	Hydrophobic Fumed Silica
Uhlaka Uhlanga	Dimetil diklorosilano (DMCS)	Hexamethyldisilazane (HMDS)	Polydimethylsiloxane (PDMS)
Specific Surface Area (BET)	170-200 m²/g	200-250 m²/g	180-220 m²/g
Iholo yePaki enkulu	16 nm	7 nm	7 nm
Bulk Density	50 g/L (loose state)	40 g/L (loose state)	50 g/L (loose state)
pH Value (10% Aqueous Dispersion)	3.7-4.7	4.0-5.0	4.5-5.5
接触角	>150° (completely hydrophobic)	>160° (super-hydrophobic)	>155° (kuvhuvhu kwekushanduka)
Oil Absorption Value (DBP Method)	2.0-2.5 mL/g	2.8-3.2 mL/g	2.3-2.7 mL/g
Thermal Stability	Resistant to 200°C	Resistant to >300°C	Resistant to 250°C

Isicelo Sezimo	推荐等级	Mechanism	Ukuphakama Kwesilinganiso	Tipekale Kazo
Silicone Rubber (RTV/HTV)	R972	Presents hydrophobicity, enhances moisture resistance and tear strength	1-3%	Ibhaktheri yokuhlala, izixazululo zokufaka ezisebenzayo
High-Temperature Vulcanized Rubber	R974	Enhances structural stability at high temperatures, inhibits filler sedimentation	2-5%	Automotive engine seals, oven rubber pads
Rubber Composites	H18	Improves filler dispersion, reduces mixing torque	0.5-2%	Tire sidewalls (kuqhamuka kweozone yokuphuka)

Isicelo Sezimo	推荐等级	核心功能	Tekniese Indeks Optimalisering	Tipek Formulasi
Izithako Zokuvikela Ukugqwala Ezisekelwe KwiSolvent	R974	Prevents pigment sedimentation, provides thixotropy to resist sagging	Sagging <1mm (ISO 1520 standard)	Marine paints, steel structure coatings
UV-Curable Inks	H18	Prevents pigment flocculation, improves film smoothness	Surface friction coefficient reduced by 30%	Metal printing inks, label inks
High-Temperature Ceramic Coatings	R974	Withstands >300°C, maintains coating integrity	Thermal weight loss <2% (300°C/2h)	Oven interior coatings, exhaust pipe heat-resistant coatings

Isicelo Sezimo	推荐等级	Key Performance Improvement	Test Standard	Z典型应用
MS Polymer Adhesives	R974	Prevents sagging (vertical construction), enhances initial tack	Sagging ≤3mm (ASTM D2202)	Ukubhaka izindonga zokhuni, izixhumi zokuhlobisa ngaphakathi
Anaerobic Adhesives	H18	Adjusts thixotropy for gap filling	Viscosity adjustable: 500-5000 mPa·s	Mechanical part locking adhesives, thread sealants
Ukuxhunywa KwezeMveliso Zokudla	R972	Hydrophobic anti-caking, complies with FDA 21 CFR 172.480	Heavy metal content <10ppm	Gummy coating adhesives, capsule lubricants

Isicelo Sezimo	推荐等级	Modification Effect	Ukulungiswa Kwezimfuneko Zokusebenza	Izinto Ezijwayelekile
Polyolefins (PE/PP)	H18	Reduces melt viscosity, improves extrusion stability	Melt index increased by 15% (ISO 1133)	Izi zikhala, izingxenye eziphumelele (isb., imfucumfucu)
Injiniya Plastics (PA/PC)	R974	Enhances interfacial compatibility, improves impact resistance	Notched impact strength +20% (ISO 179)	Automotive components, electronic casings
Degradable Plastics	R972	Prevents filler agglomeration, improves degradation uniformity	Elongation at break retention >85%	Agricultural mulch films, disposable tableware

Senaryo	Grado	Unique Value	Industriële Standaarde
Lithium Battery Electrode Slurries	H18	Thickens to prevent sedimentation, improves coating uniformity	Slurry viscosity fluctuation ≤±5%
Kosmetikpulver (Augen Schatten/Gesichtspuder)	R972	Hydrophobicity ehlisa ukuhlanganiswa kwesikhumba, ivimbela ukuhlanganiswa	Ziyamukelekile ngeMithetho yezeMveliso yezeMveliso zeMveliso zezeMveliso.
Aerospace Sealants	R974	Resista ukuguguleka kwezimoto, igcina ukuguquguquka ezingeni eliphezulu	Certified to ASTM D2000 aerospace material standards