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HJSIL® R274 Hydrophobic Fumed Silica

HJSIL® R274 is a kind of hydrophobic fumed silica, treated with DDS (Dimethyldichloro-silane). It’s high purity white colloidal powder.
  1. Reinforcement in elastomer, can effective prevent from structurization and prolong the shelf-life of RTV silicone sealants
  2. High hydrophobicity and stable thixotropy, using in coating and ink can prevent from anti-caking, anti-sagging and anti-thixotrophy
  3. High hydrophobicity and rheology in adhesives and sealants
  4. Improve the homoeneity and stability of pigment
  5. Improve the free flow of power coating and anti-caking
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Product Description

Characteristics

HJSIL® R274 is a kind of hydrophobic fumed silica, treated with DDS (Dimethyldichloro-silane). It’s high purity white colloidal powder.


Properties

  • Thickening and thixotropy:HJSIL provides thickening and thixotropic effects in liquid systems such as polyesters, epoxies, and urethane resins.

  • Reinforcement:Adding HJSIL as a filler material improves various mechanical properties of elastomers, including modulus, elongation at break, tensile strength and tear resistance. HJSIL’s large specific surface area also makes it possible to achieve excellent transparency in elastomers.

  • Anti-settling effects:HJSIL improves the suspension behavior in liquid systems, such as pigmented coatings or resins containing fillers.

  • Anti-caking, effects for improved flow characteristics:Due to a property that makes it behave like ball bearings, HJSIL resists lumping and clogging. It can be used to improve the storage stability of powders that are especially prone to caking. HJSIL can also be used to improve flow characteristics and prevent flow problems

  • Anti-blocking effects:HJSIL is added to film resins to reduce “sticking”. It reduces close contact between film layers

  • Adsorbent:Gaseous, liquid or solid materials can be precipitated or adsorbed on the surface of HJSIL. This serves as an ideal carrier or substrate for active ingredients due to its high specific surface area and inertness in the presence of all chemicals except strong alkalis and hydrofluoric acid

  • Insulation:With its very low solid state conductivity and vast spacing between particles, HJSIL provides excellent electrical and thermal insulation properties


Characteristic physico-chemical data

Properties and test methods

Unit

Typical Value

Standardization

Specific surface area (BET)

m²/g

170±20

GB/T20020

pH value
(in 4% dispersion)


3.8 ~ 5.0

GB/T20020

Loss on drying
(2 hours at 105 °C)

Wt%

≤ 0.5

GB/T20020

Loss on ignition
(2 hours at 1000 °C,
based on material dried for 2 hours at 105 °C)


Wt%


≤ 2.0

GB/T20020

Silica content
(based on ignited material)

Wt%

≥ 99.8

GB/T20020

Tamped density
(based on material dried for 2 hours at 105 °C)

g/L

40 ~ 60

GB/T20020

Carbon content
(based on material dried for 2 hours at 105 °C)

Wt%

0.7 ~ 1.3

GB/T20020


Applications

  • Elastomer: HTV & RTV silicone rubber, LSR Coatings and inks

  • Adhesive and sealants

  • Negative toners

  • Powder coatings

组 110


Packaging and storage

HJSIL® R274 is supplied in 10kg kraft paper bags. We recommend to store the product in closed containers under dry conditions and to protect the material from volatile substances.

组 4759


Product Classification

Contact Us
Phone: +86 156 3910 5040
E-Mail: info@minmetalseast.com
Fax: +0086 391 2937006
Add: No.1159, Renmin Road,
Jiaozuo City, Henan Province, P.R.China

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Contact Us

Phone: +86 391-2937005

E-Mail: info@minmetalseast.com

Fax: +86 391 2937006

Add: No.1159, Renmin Road,
Jiaozuo City, Henan Province, P.R.China

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