Polydimethylsiloxy Treated Fumed Silica for Vinyl Ester, Epoxy & Polyurethane Systems (H18)

• Customization: Available
• CAS No.: 67762-90-7
• Formula: Sio2
• Model NO.: H18
• Classification: Silicon Dioxide
• Grade Standard: Industrial Grade
• Kind: Acidic Oxide
• Quality: First Class
• Type: Hydrophobic
• Form: White Colloidal Powder
• Bet Surface: 170 - 230 M²/G
• Sio2 Content: > 99, 8 %
• pH-Value: 4.0 - 6.8
• Surface Modification: Polydimethylsiloxy
• Transport Package: Bag
• Specification: 10KG/Bag
• Trademark: WACKER
• Origin: Germany
• HS Code: 2811229000

Product Description

Discover high-performance HDK® H18 hydrophobic silica powder - the ideal thickening agent for sealants, adhesives, and industrial coatings. Superior quality from WACKER.
 

Product Description

 

HDK® H18 is a high-purity hydrophobic pyrogenic silica produced through advanced flame hydrolysis. This white colloidal powder features excellent thickening and thixotropic properties, making it ideal for sealants, adhesives, and industrial coatings. With its unique surface modification, HDK® H18 delivers superior performance in polyurethane, epoxy, and vinylester systems.
 

Detailed Product Description

1. What is HDK® H18 Pyrogenic Silica?

HDK® H18 is synthetic, hydrophobic, amorphous silica, produced via flame hydrolysis
Manufactured by WACKER, a globally trusted chemical supplier, this product ensures superior quality, consistency, and effectiveness.

Key Features:

√ Hydrophobic nature - Excellent moisture resistance

√ Superior thickening performance - Ideal for viscosity control

√ Enhanced thixotropic properties - Prevents sagging in vertical applications

√ High purity amorphous silica - Consistent quality batch-to-batch

√ Optimized for PU/epoxy/vinylesters - Perfect for sealants and coatings

 

2. Applications

 

• Sealants & Adhesives:
  Provides excellent rheology control
   

• Industrial Coatings:
  Enhances anti-sag properties
   

• Composite Materials:
  Improves processing characteristics
   

• Printing Toners:
  Acts as flow control agent
   

• Offset Printing Inks:
  Modifies rheological behavior

 

3.Best Practices for Dispersion:

√ Use high-shear mixing equipment

√ Disperse properly before adding other components

√ Maintain low humidity during processing

√ Avoid excessive air incorporation

 

4. Why Choose HDK® H18?

√ Consistent quality from a trusted manufacturer

√ Proven performance in demanding applications

√ Technical support available from WACKER experts

√ Global availability with reliable supply

 

Product Parameters

Typical general characteristics	Inspection Method	Value
SiO2 content (based on the substance heated at 1000 °C for 2 h)	DIN EN ISO 3262-19	> 99,8 %
BET surface	DIN ISO 9277 DIN 66132	approx. 120 m²/g
Density at 20 °C (SiO2)	DIN 51757	approx. 2.2 g/cm³
Residual silanol content		25.0 %
INCI name		Silica Dimethyl Silylate

 

Specification	Inspection Method	Value
BET surface	DIN ISO 9277 DIN 66132	170 - 230 m²/g
pH-Value (in 4 % aqueous dispersion)	DIN EN ISO 787-9	4.0 - 6.8
Tamped density	DIN EN ISO 787-11	approx. 50 g/l
Loss on drying , ex works (2 h at 105 °C)	DIN EN ISO 787-2	< 0.6 %
Carbon content	DIN ISO 10694	4.0 - 5.2 %
Sieve residue , acc. to Mocker > 40 µm	DIN EN ISO 787-18	< 0.3%
Surface modification		Polydimethylsiloxy

These figures are only intended as a guide and should not be used in preparing specifications.

 

Packaging & Storage

 

HDK® H18 is offered in following packaging:
• pallet with paper bags:10 kg bags
• Big bags:160 kg (big bag on pallet)

Storage
The 'Best use before end' date of each batch is shown on the shipping label and the certificate of analysis.
HDK® H18 should be stored in the original packaging in dry storage areas.

Storage beyond the date specified on the label does not necessarily mean that the product is no longer usable. In this case however, the properties required for the intended use must be checked for quality assurance reasons.

During transportation and processing HDK® H18 may cause electrostatic charges. Like other amorphous silicas HDK® H18 does not show either carcinogenic (IARC classification, Volume 68, 1997) or mutagenic properties.

 

Conclusion

HDK® H18 hydrophobic pyrogenic silica stands out as the premium choice for formulators seeking reliable thickening and rheology control in sealants, adhesives, and coatings.
Its unique hydrophobic characteristics and consistent performance make it indispensable for high-quality industrial applications.
 

Company Profile

 

Shanghai Youjiatuo Chemical Co., Ltd
A wholly-owned subsidiary of Japan's Aixiu Co., Ltd., is headquartered in Osaka, Japan.
We are dedicated to the research and development of specialty chemicals and committed to serving global customers with high-quality products and excellent services, while also building a safe and healthy environment for our employees and the community.

Our company provides products and solutions to customers in every corner of the globe, serving various key industries such as infrastructure, transportation, environmental, and consumer goods industries.
Currently, we offer high-performance solutions that address our customers' challenges and are continuously improving them to meet future demands.

Main Products:
Carbon Black
Involves 4 major fields: Rubber & Plastic; Ink; Coating; Sealant

Additives:
• Defoaming Agent
• Rheology Modifier
• Substrate Wetting Agent
• Wetting Dispersant

Fumed Silica

 

 

Our Advantages

• Comprehensive Solutions
Provide different solutions for different needs.

• Product Development
Oriented by customer needs, with professional technology as a bridge, we are dedicated to the development of the industry.

• Overseas Agency
Our business covers multitude of production industries, offering clients high-quality services and competitive products.

• Logistics & Warehousing
To meet the needs of our customers, we fully understand the importance of stable and continuous production.