20um Expandable Polymer Microspheres 20–35 Μm SY808 97%

SY808 Thermally Expandable Polymer Microspheres

SY808 is a white-powder thermally expandable polymer microsphere developed as a physical blowing agent for polymer processing.

With a particle size of 20–35 μm, expansion starting at 135–145°C and maximum expansion at 195–210°C, SY808 is suitable for medium- to high-temperature foaming processes.

It can help manufacturers reduce material density, create fine closed-cell structures and improve product softness, thickness and surface appearance.

SY808 Technical Specifications

How Do SY808 Expandable Microspheres Work?

SY808 microspheres contain an expandable core enclosed by a thermoplastic polymer shell.

When heated:

1. The polymer shell begins to soften.

2. The encapsulated core generates internal pressure.

3. The microspheres expand into hollow microballoons.

4. Fine closed cells form inside the polymer matrix.

This physical expansion process provides controlled foaming without relying only on gas-producing chemical reactions.

Key Advantages of SY808

• Fine 20–35 μm particle size

• Controlled thermal expansion

• High solid content above 97%

• Low-density closed-cell structure

• Good dispersion in polymer formulations

• Improved surface smoothness

• Reduced product weight

• Adjustable thickness and cushioning

• Suitable for medium- and high-temperature processing

• Can be combined with other blowing agents

Lightweight Polymer Foaming

SY808 creates hollow microstructures inside the material, helping reduce the density and weight of finished products.

It is suitable for applications requiring lightweight construction without large or irregular foam cells.

Fine and Uniform Cell Structure

Compared with conventional gas-generating foaming agents, expandable microspheres can provide more controlled cell size and distribution.

The fine closed-cell structure can help reduce:

• Large bubbles

• Surface pinholes

• Uneven expansion

• Rough surfaces

• Irregular product density

Improved Surface and Material Properties

SY808 can be used to improve multiple product characteristics, including:

• Surface smoothness

• Softness and flexibility

• Cushioning performance

• Thickness and volume

• Thermal insulation

• Sound and vibration damping

• Anti-slip texture

• Dimensional stability

Actual performance depends on the base material, dosage and processing conditions.

Main Applications

Thermoplastics and Elastomers

SY808 can be evaluated in polymer foaming processes involving:

• PVC

• EVA

• TPE

• TPR

• Rubber compounds

• Other compatible thermoplastic systems

Typical products include shoe soles, foam sheets, profiles, seals, gaskets and lightweight molded parts.

Synthetic Leather

SY808 can create a fine foamed layer in synthetic leather formulations.

Potential benefits include:

• Reduced coating weight

• Increased softness

• Improved cushioning

• Enhanced thickness

• Smoother surface appearance

Printing Inks and Raised Printing

Thermally expandable microspheres can generate three-dimensional effects after heating.

Typical applications include:

• Foam printing inks

• Textile printing

• Wallpaper printing

• Raised graphics

• Decorative coatings

• Braille printing

Coatings

SY808 can be incorporated into selected coating systems for controlled expansion and lightweight texture.

Applications may include:

• Automotive coatings

• Underbody coatings

• Textile coatings

• Paper coatings

• Leather coatings

• Functional surface coatings

Adhesives and Sealants

SY808 may be used to modify the density, flexibility and gap-filling properties of compatible adhesives and sealants.

It can also help create lightweight bonding layers and compressible sealing structures.

Lightweight Composite Materials

Potential applications include:

• Lightweight putty

• Artificial stone

• Polymer clay

• Construction materials

• Porous ceramics

• Lightweight composite panels

• Decorative molded products

Recommended Processing Methods

SY808 can be evaluated in different production processes, including:

• Extrusion

• Injection molding

• Press molding

• Coating

• Calendering

• Printing

• Mixing and casting

The microspheres should be dispersed uniformly before reaching the expansion temperature.

Processing Temperature Guidance

SY808 begins to expand at approximately 135–145°C and reaches maximum expansion at approximately 195–210°C.

For stable foaming performance:

• Match the processing temperature to the expansion window.

• Avoid excessive temperature or prolonged heating.

• Minimize unnecessary high shear after expansion begins.

• Confirm the residence time of the production process.

• Conduct a small-scale trial before mass production.

Overheating may damage the expanded polymer shell and reduce the final foaming effect.

Recommended Dosage

The appropriate dosage depends on:

• Base polymer

• Target density

• Required expansion ratio

• Processing temperature

• Product thickness

• Mixing conditions

• Surface quality requirements

Laboratory testing is recommended to determine the optimum addition level for each formulation.

SY808 vs. Chemical Blowing Agents

SY808 may be used alone or evaluated in combination with compatible chemical blowing agents.

Why Choose SHBC SY808?

SHBC supplies expandable polymer microspheres for research, formulation development and industrial production.

Our advantages include:

• Clearly defined particle size

• Controlled expansion temperature range

• High solid-content powder

• Batch supply capability

• Application-oriented product selection

• Sample evaluation support

• Technical communication for formulation development

Storage and Handling

Store SY808 in a sealed package in a cool, dry and well-ventilated area.

Keep the product away from:

• Heat sources

• Direct sunlight

• Open flames

• High humidity

• Premature processing temperatures

Avoid strong compression and unnecessary friction during handling. Review the product SDS before use.

Frequently Asked Questions

What is SY808?

SY808 is a white-powder thermally expandable polymer microsphere used as a physical blowing agent and lightweight polymer additive.

What is the particle size of SY808?

The unexpanded particle size is 20–35 μm.

At what temperature does SY808 start expanding?

SY808 starts expanding at approximately 135–145°C.

What is the maximum expansion temperature?

The recommended maximum expansion temperature range is approximately 195–210°C.

What is the solid content?

The solid content of SY808 is greater than 97%.

What materials can SY808 be used with?

SY808 can be evaluated in compatible thermoplastics, elastomers, rubber, coatings, printing inks, synthetic leather, adhesives and composite materials.

Can SY808 reduce product weight?

Yes. The microspheres expand into hollow microballoons, which can reduce material density and finished-product weight.

Can SY808 improve surface quality?

Its fine closed-cell structure can help produce smoother surfaces and reduce large, irregular foam cells when processing conditions are properly controlled.

How should I select the dosage?

Dosage should be selected according to the base material, processing temperature, target density, thickness and required surface properties.

Are application tests necessary?

Yes. Small-scale testing is recommended because expansion performance depends on formulation, equipment, temperature, shear and residence time.

Request SY808 Samples and Technical Information

Contact Shanghai SanYu Biotechnology Co., Ltd. for SY808 samples, technical specifications and application support.

Please provide the following information when making an inquiry:

• Base material

• Product application

• Processing method

• Processing temperature

• Current blowing agent

• Target density

• Required surface quality

• Estimated purchase quantity