Technical data and supply specifications
Check grade, key properties and methods. Distinguish typical values from guaranteed limits.
Precipitated silica packaging reference · Cjp24 · Image source · CC BY-SA 3.0
Functional inorganic materials · Industrial selection
Precipitated silica
For rubber reinforcement, powder flow or coating matting,
select material properties for the intended application.
- Material type
- Synthetic amorphous silica
- Common CAS identifiers
- 7631-86-9 / 112926-00-8
- Product form
- Powder or granules, depending on grade
Confirm the offered grade, specification and delivery conditions for your project. Verify CAS number and identity against the SDS for that grade.
Compare precipitated silica, fumed silica, silica gel and silica sol ↗
01 Selecting grades
Identify the application and select the properties that matter.
Different applications require different properties.
These selection directions are starting points. Confirm the ENVO grade for your application.
The application notes draw on public material references and purchasing checks. Confirm suitability with the specific grade and sample evaluation.
02 Applications and troubleshooting
Which problem
are you working on?
Describe the conditions
so the next trial answers the right question.
Have process conditions or test results?
Include your current specification, target values and evaluation conditions.
01
Why might two precipitated silica grades perform differently?
Particle size, surface area, surface treatment and physical form can differ under the same generic name. Identify the function before comparing grades.
Check first
- State the application and the problem to resolve
- Match the grade to the correct technical document revision
- Include the critical acceptance criteria in the purchasing specification
02
Where should we look when dispersion or processing falls short?
Record the material properties together with formulation, equipment and process conditions so that changes can be traced.
Check first
- Match sample and batch identities to their documents
- Record processing conditions and evaluation methods
- Compare physical form, dispersion and finished-part properties
03
Why do similar absorption values produce different powder behaviour?
Published absorption values relate to a defined test. Evaluate the intended liquid, particle size and storage environment together.
Check first
- Check the method and units
- Test with the actual material to be carried
- Track changes during packaging and storage
04
What if the gloss is right but the clarity or feel is wrong?
Evaluate matting with the binder, particle size and surface treatment. Keep film formation and measurement conditions the same.
Check first
- Set target gloss and measurement conditions
- Check clarity and surface feel together
- Confirm the appropriate coating-grade matting agent
03 Technical specifications and selection criteria
Read each value together with its test conditions.
| Property to check | Why it matters | Information to request |
|---|---|---|
| Identity and surface treatment | Identify the silica type, treatment and corresponding grade | Product name, grade, SDS and surface treatment description |
| Specific surface area / m²·g⁻¹ | Compare material surface characteristics as one selection factor | Method, conditions and applicability |
| Absorption / mL per 100 g | Assess absorption under a defined test | Test liquid, method and sample condition |
| Particle-size distribution / µm | Compare dispersion, surface finish and flow requirements | Reported percentiles such as d50, instrument and method |
| Loss on drying / % | Review moisture-related sample information | Temperature, time and sampling conditions |
| pH | Compare acidity or alkalinity under defined dispersion conditions | Dispersion ratio, medium and method |
| Bulk or tapped density / g·L⁻¹ | Assess dosing, packaging and powder handling | Distinguish loose bulk density from tapped density and confirm the method |
| Appearance and form | Check powder or granules and consistency across supplies | Photos, samples and agreed appearance criteria |
How to read published dataCompare typical values, units and test conditions
Typical values from the Evonik SIPERNAT® 22 S technical data sheet dated 2025-12-12 illustrate how to read the data. ENVO specifications and equivalency require separate confirmation.
| Property | Published typical value | Conditions / method |
|---|---|---|
| Specific surface area | 180 m²/g | Multipoint method, ISO 9277 |
| DOA absorption | 235 mL/100 g | ISO 19246, based on the original material |
| Particle size d50 | 13 μm / 11 μm | Coulter LS and Horiba (or Bettersizer), respectively, according to ISO 13320 |
| pH | 6.5 | 5% aqueous dispersion, according to ISO 787-9 |
Even within the same data sheet, particle size can vary with the instrument used. Use agreed acceptance limits for an order, rather than treating typical values as guarantees.
Do you have a target specification?
Include the property, unit and method to make the target unambiguous.
04 Quality and documentation
Which documents support your decision?
Match each document to the product, grade and revision.
Check sample documents separately from records for the delivered lot.
Safety data sheet
Verify the identity, language and applicable handling, storage and transport information.
Lot inspection documents
Request an example during supplier assessment. At delivery, match the lot number, test items and actual results.
Purchasing worksheets
Use these forms to describe requirements alongside the product’s technical and safety documents.
- 01Confirm the product and grade
- 02Check the documents and revisions
- 03Evaluate the sample
- 04Verify the delivery lot
05 Packaging and delivery
Plan for receipt before dispatch.
Packaging, minimum order, pricing and lead time
depend on the offered grade, quantity and destination.
Packaging for your handling system
Specify pack type, net weight, pallet and protection requirements. Confirm feasibility for the offered grade.
- Package format and net weight
- Label language and marking requirements
- Unloading, stacking and receiving conditions
Applicable storage and transport conditions
Use the offered product’s documents and SDS to confirm storage conditions, pack integrity and the applicable storage period.
- Storage instructions for the grade
- Package seals and receiving inspection
- Lot identification and inventory traceability
Confirm the commercial terms
Specify the destination country or port, quantity and required date. Agree on transport and shipping documents.
- Order quantity and purchasing frequency
- Destination and delivery terms
- Shipping documents and review requirements
Six details for your inquiry
Include these details in the first exchange.
- Application and target function
- Grade or target specification
- Quantity per order
- Packaging and label requirements
- Destination and requested delivery date
- Required documents and samples
06 Frequently asked questions
Questions to resolve
before you order.
Can precipitated and fumed silica be substituted directly?
Their production routes and material properties differ. Assess the specific grade against the application and target performance using a sample trial.
Is the CAS number or silica content enough to choose a grade?
A CAS number identifies a substance. Grade selection also depends on particle size, surface area, treatment, processing and application requirements.
Are published reference values ENVO supply specifications?
Published values are attributed to the original grade and source. Confirm the offered ENVO grade and acceptance requirements in the order documents.
Which grades, pack sizes and minimum quantities are available?
Send the application, target properties, quantity and destination. We will check grades, packing options, minimum order, price and lead time for your enquiry.
What information should I include when requesting a sample?
Describe the formulation, intended function, key properties, test methods, estimated purchasing volume and delivery destination. Sample size, shipping and costs are agreed separately.
How can a bulk order be matched to the approved sample?
Record the grade, specification revision, trial conditions and packaging requirements. At delivery, compare lot numbers and the actual batch COA with the order.
Does industrial documentation cover food or pharmaceutical purchases?
These uses require the appropriate grade, origin and supporting documents for the intended market. A generic name or CAS number alone cannot establish suitability.
Can I specify packaging and labelling?
Include pack type, net weight, label languages and other requirements in your enquiry. Feasibility, quantities and delivery arrangements depend on the order.
Technical references
The following public sources support the application notes and example values. Accessed 2026-10-27. Brand names identify the sources. Confirm actual availability, authorization claims, grade equivalence and specifications separately with ENVO for the proposed order.
- Evonik · ULTRASIL precipitated silica for rubber ↗Rubber fillers, powders, granules and grade differences
- Evonik · SIPERNAT 22 S product information ↗Absorption, powder flow, anticaking and chemical identifiers
- Evonik · ACEMATT OK 520 product information ↗Surface-treated precipitated silica for coatings
- SIPERNAT 22 S · published technical data sheet, 12 December 2025 ↗Reference grade values for interpreting a data sheet
- Evonik · technical guide to carriers, page 14 ↗Relationship between absorption, particle size, pore structure and test conditions
Precipitated silica · Product inquiry
Tell us about your application.
Send your target, specification and purchase plan so the team can identify the next information needed.