35um Expandable Polymer Microspheres 20–35um SY907 97%

SY907 35 μm Thermally Expandable Polymer Microspheres

SY907 is a thermally expandable polymer microsphere developed as a physical blowing agent for lightweight polymer processing.

With a nominal particle size of 35 μm, a particle size range of 20–35 μm and solid content above 97%, SY907 provides controlled expansion for fine closed-cell foaming.

It starts expanding at 150–160°C and reaches maximum expansion at 200–210°C.

SY907 Technical Specifications

How Do SY907 Microspheres Work?

SY907 microspheres contain an expandable core enclosed by a thermoplastic polymer shell.

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

This physical expansion increases product volume while reducing material density.

Key Advantages of SY907

• Controlled 20–35 μm particle size

• High solid content above 97%

• Defined expansion temperature window

• Fine and uniform closed-cell structure

• Effective density and weight reduction

• Improved product thickness and volume

• Reduced large bubbles and surface pinholes

• Improved surface smoothness

• Better cushioning and flexibility

• Suitable for high-temperature polymer processing

Lightweight and Controlled Foaming

SY907 forms individual hollow cells throughout compatible polymer matrices.

Potential benefits include:

• Lower finished-product weight

• Reduced raw-material consumption

• Increased product volume

• Improved cushioning

• Better thermal insulation

• Improved sound and vibration damping

• More consistent product density

Expandable microspheres are used by major manufacturers to combine lightweighting with fine closed-cell structures and functional performance.

Suitable Materials

SY907 can be evaluated in compatible systems such as:

• PVC

• EVA

• PE

• PP

• TPE

• TPR

• TPU

• EPDM

• Rubber compounds

• Adhesives and sealants

• Printing inks

• Coating formulations

Compatibility should be confirmed according to melt viscosity, processing temperature and final performance requirements.

Main Applications

Thermoplastic Extrusion

SY907 can be evaluated in:

• Plastic profiles

• Foam sheets

• Tubes and hoses

• Cable materials

• Sealing strips

• Synthetic wood

• Lightweight panels

It can help reduce density while maintaining a fine cell structure and smooth surface.

Injection-Molded Components

Potential applications include:

• Automotive interior parts

• Plastic housings

• Gaskets

• Sealing components

• Lightweight molded parts

• Functional polymer components

Footwear and Shoe Soles

SY907 can be evaluated in EVA, TPU, TPR and compatible rubber formulations.

Potential benefits include lower weight, improved cushioning, increased softness and more uniform foam cells.

Synthetic Leather

In synthetic leather and coated fabrics, SY907 may help provide:

• Increased thickness

• Reduced coating weight

• Improved softness

• Better flexibility

• Enhanced cushioning

• Improved surface appearance

Thermally expandable microspheres are commonly positioned for softness, cushioning, thickness and lightweight synthetic-leather layers.

Foam Printing Inks

SY907 can be used in heat-activated formulations for:

• Textile foam printing

• Wallpaper printing

• Raised graphics

• Decorative patterns

• Braille printing

• Three-dimensional printing effects

Coatings, Adhesives and Sealants

SY907 may be used to reduce density or modify texture in:

• Textile coatings

• Leather coatings

• Automotive coatings

• Industrial coatings

• Construction sealants

• Gap-filling adhesives

• Foam tapes

• Compressible sealing layers

Automotive Materials

Potential automotive applications include:

• Weather strips

• Glass run channels

• Interior trim

• Sealing profiles

• Gaskets

• Sound-damping components

Automotive parts, footwear, foam inks, wallpaper, artificial leather and heat-release applications are established application areas for thermally expandable microspheres.

Recommended Processing Methods

SY907 can be evaluated in:

• Extrusion

• Injection molding

• Compression molding

• Calendering

• Coating

• Printing

• Casting

• Polymer compounding

Uniform dispersion before thermal expansion is important for consistent foaming.

Processing Temperature Guidance

SY907 begins expanding at approximately 150–160°C and reaches maximum expansion at approximately 200–210°C.

For stable processing:

• Keep premixing temperatures below Tstart.

• Avoid premature expansion during compounding.

• Match the actual material temperature to the required expansion.

• Control heating time and residence time.

• Avoid excessive shear after expansion begins.

• Avoid prolonged heating above Tmax.

• Confirm conditions through laboratory trials.

After reaching maximum expansion, excessive heating may weaken the shell and reduce the retained expansion.

Factors Affecting Foaming Performance

The final expansion result depends on:

• Base polymer

• SY907 dosage

• Actual material temperature

• Heating time

• Processing pressure

• Melt viscosity

• Mixing efficiency

• Product thickness

• Cooling conditions

Machine settings may differ from the actual temperature experienced by the microspheres.

Recommended Addition Level

The optimum dosage should be selected according to:

• Target density

• Required expansion ratio

• Base material

• Product thickness

• Processing method

• Surface requirements

• Mechanical-property requirements

Laboratory and pilot-scale testing are recommended before commercial production.

SY907 vs. Chemical Blowing Agents

SY907 may be evaluated alone or together with compatible chemical blowing agents.

Why Choose SHBC SY907?

• Defined 20–35 μm particle size range

• Nominal 35 μm particle size

• Solid content above 97%

• Controlled high-temperature expansion

• Suitable for formulation development

• Stable batch supply

• Sample evaluation support

• Custom packaging options

• Bulk production capability

• Technical support for product selection

Storage and Handling

Store SY907 in its original sealed packaging in a cool, dry and well-ventilated place.

Keep away from:

• Direct sunlight

• Heat sources

• Open flames

• High humidity

• Excessive pressure

• Premature expansion temperatures

Avoid unnecessary friction and strong compression. Review the Safety Data Sheet before use.

Frequently Asked Questions

What is SY907?

SY907 is a thermally expandable polymer microsphere used as a physical blowing agent and lightweight polymer additive.

What is the particle size of SY907?

The nominal particle size is 35 μm, with a particle size range of 20–35 μm.

What is the solid content?

The solid content is greater than 97%.

When does SY907 start expanding?

SY907 starts expanding at approximately 150–160°C.

What is the maximum expansion temperature?

The maximum expansion temperature is approximately 200–210°C.

How does SY907 reduce material weight?

The microspheres expand into hollow microballoons, increasing material volume while reducing the density of compatible products.

Can SY907 be used in extrusion?

Yes. It can be evaluated in profiles, sheets, hoses, cables, sealing strips and other extrusion applications.

Can SY907 be used in injection molding?

Yes. Processing temperature, pressure, dosage and residence time should be optimized through testing.

Can SY907 be combined with chemical blowing agents?

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

Is application testing required?

Yes. Laboratory and pilot-scale testing are recommended because performance depends on the formulation, equipment and processing conditions.

Request SY907 Samples

Contact Shanghai SanYu Biotechnology Co., Ltd. for SY907 samples, technical specifications, SDS information and bulk supply.

Please provide:

• Base material

• Final application

• Processing method

• Processing temperature

• Target density

• Required expansion level

• Current blowing agent

• Estimated purchase quantity