22um Expandable Polymer Microspheres 20–35um SY809 97%

SY808 Thermally Expandable Polymer Microspheres

SY808 is a white-powder thermally expandable polymer microsphere supplied by SHBC. It functions as a physical blowing agent for lightweight polymer foaming and fine closed-cell structure formation.

With a particle size of 20–35 μm, SY808 starts expanding at 150–160°C and reaches maximum expansion at 205–215°C. It is suitable for medium- and high-temperature polymer processing.

SY808 Technical Specifications

How SY808 Expandable Microspheres Work

SY808 consists of a thermoplastic polymer shell containing an expandable core.

When heated, the polymer shell softens and the internal pressure increases. The microspheres expand into hollow microballoons and form fine closed cells inside the material.

This controlled expansion can reduce material density while improving product thickness, softness and surface appearance.

Key Advantages

• Fine 20–35 μm particle size

• High solid content above 97%

• Controlled thermal expansion

• Fine and uniform closed-cell structure

• Effective density reduction

• Improved surface smoothness

• Adjustable foaming level

• Good dispersion in compatible formulations

• Reduced risk of large or irregular bubbles

• Suitable for medium- and high-temperature processing

Lightweight Polymer Foaming

SY808 creates hollow microstructures inside polymer materials, increasing volume while reducing the amount of solid material required.

It may help manufacturers achieve:

• Lower product density

• Reduced finished-product weight

• Lower material consumption

• Increased product thickness

• Improved cushioning

• Better thermal insulation

Fine Closed-Cell Structure

Expandable microspheres form individual hollow cells instead of relying only on freely generated gas.

The resulting microcellular structure may help reduce:

• Large foam cells

• Surface pinholes

• Uneven expansion

• Rough surfaces

• Local density variation

• Irregular product appearance

Suitable Materials

SY808 can be evaluated with compatible polymer and elastomer systems, including:

• PVC

• EVA

• PE

• PP

• TPE

• TPR

• TPU

• EPDM

• Rubber compounds

• Adhesive formulations

• Coating systems

Compatibility should be confirmed according to processing temperature, viscosity and formulation composition.

Main Applications

Thermoplastic Extrusion

SY808 can be used in foamed extrusion products such as:

• Plastic profiles

• Foam sheets

• Tubes and hoses

• Cable materials

• Sealing strips

• Synthetic wood

• Lightweight panels

It can provide density reduction while maintaining a fine surface structure.

Injection-Molded Parts

In injection molding, SY808 may help produce lightweight components with controlled microcellular structures.

Potential applications include:

• Automotive interior parts

• Plastic housings

• Lightweight molded components

• Gaskets

• Sealing parts

• Functional polymer components

Shoe Soles and Footwear Materials

SY808 can be evaluated in EVA, TPR, TPU and rubber-based footwear formulations.

Potential benefits include:

• Lower weight

• Improved softness

• Better cushioning

• Increased thickness

• Fine foam structure

• Improved surface appearance

Synthetic Leather

SY808 can create a lightweight foamed layer in synthetic leather and coated fabric systems.

It may improve:

• Softness

• Flexibility

• Thickness

• Hand feel

• Cushioning

• Surface smoothness

Printing Inks

SY808 can be used in heat-activated foam printing formulations.

Typical applications include:

• Textile foam printing

• Wallpaper printing

• Raised graphics

• Decorative printing

• Three-dimensional patterns

• Braille printing

Coatings

SY808 can be evaluated as a lightweight and texture-modifying additive in compatible coatings.

Applications may include:

• Automotive coatings

• Textile coatings

• Paper coatings

• Leather coatings

• Industrial protective coatings

• Decorative coatings

Adhesives and Sealants

SY808 may reduce density and improve compressibility in compatible adhesive and sealant formulations.

Potential applications include:

• Automotive sealants

• Construction sealants

• Gap-filling adhesives

• Foam tapes

• Lightweight bonding layers

• Thermal-release adhesive systems

Automotive Components

SY808 may be used in polymer and elastomer components requiring lightweighting, sealing or vibration damping.

Typical products include:

• Weather strips

• Glass run channels

• Interior trim

• Gaskets

• Sealing profiles

• Sound-damping components

Lightweight Composite Materials

SY808 can also be evaluated in:

• Lightweight putty

• Artificial stone

• Polymer clay

• Composite panels

• Construction materials

• Porous ceramics

• Decorative molded products

Processing Methods

SY808 is suitable for evaluation in different manufacturing processes, including:

• Extrusion

• Injection molding

• Press molding

• Calendering

• Coating

• Printing

• Casting

• Compound mixing

Uniform dispersion before expansion is important for consistent foam quality.

Processing Temperature Guidance

SY808 starts expanding at approximately 150–160°C and reaches maximum expansion at approximately 205–215°C.

For stable foaming performance:

• Keep initial mixing temperatures below the expansion range.

• Match the final processing temperature to the required expansion level.

• Avoid unnecessary overheating.

• Control residence time at elevated temperatures.

• Reduce excessive shear after expansion begins.

• Evaluate the actual material temperature, not only the machine setting.

Heating beyond the recommended temperature or for an excessive time may damage the expanded shell and reduce the final expansion effect.

Dosage Recommendations

The optimum dosage depends on:

• Base material

• Target product density

• Required expansion ratio

• Product thickness

• Processing temperature

• Residence time

• Mixing efficiency

• Required mechanical properties

Small-scale formulation testing is recommended before commercial production.

SY808 vs. Chemical Blowing Agents

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

Why Choose SHBC SY808?

• Defined 20–35 μm particle size

• High solid-content white powder

• Controlled expansion temperature range

• Suitable for industrial formulation development

• Consistent batch supply

• Sample testing support

• Custom packaging options

• Technical communication for product selection

• Bulk production capability

Storage and Handling

Store SY808 in its original sealed package in a cool, dry and well-ventilated place.

Avoid exposure to:

• Direct sunlight

• Heat sources

• Open flames

• High humidity

• Excessive pressure

• Premature expansion temperatures

Review the Safety Data Sheet before handling or industrial use.

Frequently Asked Questions

What is SY808?

SY808 is a thermally expandable polymer microsphere used as a physical blowing agent for lightweight polymer materials.

What is the particle size of SY808?

The unexpanded particle size is 20–35 μm.

What is the solid content?

The solid content is greater than 97%.

What is the appearance of SY808?

SY808 is supplied as a white powder.

At what temperature does SY808 start expanding?

SY808 starts expanding at approximately 150–160°C.

What is the maximum expansion temperature?

The maximum expansion temperature is approximately 205–215°C.

What happens when SY808 is heated?

The polymer shell softens and the internal core expands, forming hollow microballoons within the material.

Can SY808 reduce product weight?

Yes. Expanded hollow microspheres increase material volume and can reduce the density and weight of the finished product.

What polymers can be used with SY808?

SY808 can be evaluated with PVC, EVA, PE, PP, TPE, TPR, TPU, EPDM, rubber and other compatible systems.

Can SY808 be used in extrusion?

Yes. It can be evaluated in profiles, sheets, tubes, sealing strips and other extruded products.

Can SY808 be used for injection molding?

Yes. The processing temperature, pressure, residence time and mold conditions should be optimized through trials.

Can SY808 be combined with chemical blowing agents?

Yes. It may be used independently or combined with compatible chemical blowing agents to adjust density and cell structure.

How should the dosage be selected?

The dosage should be determined according to the base material, target density, processing temperature, product thickness and performance requirements.

Is testing required before mass production?

Yes. Laboratory and pilot-scale testing are recommended because foaming results depend on the formulation and processing equipment.

Request SY808 Samples

Contact Shanghai SanYu Biotechnology Co., Ltd. for SY808 samples, technical specifications, SDS information and bulk supply.

Please provide:

• Base material

• Final application

• Processing method

• Processing temperature

• Target density

• Required expansion ratio

• Current blowing agent

• Estimated annual quantity