27um Expandable Polymer Microspheres |97% SY819

27 μm Thermally Expandable Polymer Microspheres

SY819 is a heat-sensitive expandable polymer microsphere supplied by SHBC. It is designed as a physical blowing agent for lightweight polymer foaming and controlled closed-cell formation.

The product has an average particle size of approximately 27 μm, a particle size range of 20–35 μm and a solid content above 97%.

SY819 starts expanding at 145–150°C and reaches maximum expansion at 190–200°C, making it suitable for medium- to high-temperature polymer processing.

SY819 Technical Specifications

How Do SY819 Microspheres Expand?

SY819 consists of a thermoplastic polymer shell containing an expandable core.

When heated to the activation temperature, the polymer shell softens and the internal pressure increases. The microspheres then expand into hollow microballoons inside the material.

This controlled expansion can help create a fine closed-cell structure while increasing volume and reducing product density.

Key Advantages of SY819

• Approximately 27 μm average particle size

• Controlled 20–35 μm particle size range

• High solid content above 97%

• Defined expansion temperature window

• Fine and uniform closed-cell structure

• Controlled density reduction

• Improved product thickness

• Reduced risk of large foam cells

• Improved surface appearance

• Good dispersion in compatible formulations

• Suitable for multiple polymer-processing methods

Lightweight Polymer Foaming

SY819 forms hollow microstructures within the polymer matrix.

Depending on the formulation and processing conditions, it can help achieve:

• Lower material density

• Reduced finished-product weight

• Increased product volume

• Reduced raw-material consumption

• Improved cushioning

• Better thermal insulation

• Improved sound and vibration damping

Fine and Uniform Cell Structure

Each expandable microsphere forms an individual hollow cell during heating.

Compared with uncontrolled gas foaming, this structure can help reduce:

• Large bubbles

• Uneven cell distribution

• Surface pinholes

• Rough surfaces

• Irregular product thickness

• Local density variation

SY819 is suitable for products requiring both lightweighting and controlled surface quality.

Suitable Polymer Systems

SY819 can be evaluated in compatible polymer and elastomer formulations, including:

• PVC

• EVA

• PE

• PP

• TPE

• TPR

• TPU

• EPDM

• Rubber compounds

• Adhesives

• Sealants

• Printing inks

• Coating systems

Material compatibility should be confirmed through laboratory and pilot-scale testing.

Main Applications

Thermoplastic Extrusion

SY819 can be evaluated in foamed extrusion applications such as:

• Plastic profiles

• Foam sheets

• Tubes and hoses

• Cable materials

• Sealing strips

• Synthetic wood

• Lightweight panels

Its controlled expansion can help reduce density while maintaining a fine surface structure.

Injection-Molded Products

SY819 may be used in compatible injection-molding formulations for lightweight and microcellular components.

Typical applications include:

• Automotive interior parts

• Plastic housings

• Sealing components

• Gaskets

• Lightweight molded parts

• Functional plastic components

Shoe Soles and Footwear Materials

SY819 can be evaluated in EVA, TPR, TPU and compatible rubber formulations.

Potential benefits include:

• Lower product weight

• Improved cushioning

• Increased softness

• Controlled sole thickness

• Fine foam structure

• Improved surface appearance

Synthetic Leather

SY819 can create a lightweight foamed layer in synthetic leather and coated-fabric formulations.

Potential advantages include:

• Increased thickness

• Reduced coating weight

• Improved softness

• Better flexibility

• Enhanced cushioning

• Smooth surface structure

Foam Printing Inks

SY819 can be used in heat-activated printing formulations to create raised effects.

Typical applications include:

• Textile foam printing

• Wallpaper printing

• Raised graphics

• Decorative printing

• Braille printing

• Three-dimensional patterns

Coatings

SY819 can be evaluated as a lightweighting and texture-modifying additive in compatible coating systems.

Potential applications include:

• Textile coatings

• Leather coatings

• Automotive coatings

• Paper coatings

• Industrial coatings

• Decorative coatings

Adhesives and Sealants

SY819 may help reduce density and improve compressibility in compatible adhesives and sealants.

Potential applications include:

• Automotive sealants

• Construction sealants

• Gap-filling adhesives

• Foam tapes

• Lightweight bonding layers

• Compressible sealing materials

Automotive Components

SY819 can be evaluated in automotive polymer and elastomer products such as:

• Weather strips

• Glass run channels

• Interior trim

• Sealing profiles

• Gaskets

• Sound-damping components

Lightweight Composite Materials

Other potential applications include:

• Lightweight putty

• Artificial stone

• Polymer clay

• Composite panels

• Construction materials

• Porous ceramics

• Decorative molded products

Recommended Processing Methods

SY819 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 performance.

Processing Temperature Guidance

SY819 starts expanding at approximately 145–150°C and reaches maximum expansion at approximately 190–200°C.

For stable processing:

• Keep premixing temperatures below the expansion range.

• Match the material temperature to the required expansion level.

• Avoid premature expansion during mixing.

• Control residence time at elevated temperatures.

• Avoid unnecessary high shear after expansion begins.

• Prevent prolonged heating above the maximum expansion range.

• Conduct small-scale tests before commercial production.

Excessive temperature or prolonged heating may damage the expanded shell and reduce the final foaming effect.

Factors Affecting Expansion Performance

The final expansion result depends on:

• Base polymer

• Microsphere dosage

• Actual material temperature

• Heating time

• Processing pressure

• Melt viscosity

• Mixing efficiency

• Product thickness

• Cooling conditions

The machine setting may differ from the actual temperature experienced by the microspheres.

Recommended Addition Level

The optimum addition level should be determined according to:

• Target density

• Required expansion ratio

• Base material

• Product thickness

• Processing method

• Mechanical-property requirements

• Surface-quality requirements

Laboratory formulation testing is recommended before scale-up.

SY819 vs. Chemical Blowing Agents

SY819 may be evaluated alone or together with compatible chemical blowing agents.

Why Choose SHBC SY819?

• Defined 20–35 μm particle size range

• Approximately 27 μm average particle size

• High solid-content white powder

• Controlled thermal expansion range

• Suitable for formulation development

• Stable batch supply

• Sample evaluation support

• Custom packaging options

• Bulk production capability

• Technical communication for product selection

Storage and Handling

Store SY819 in its original sealed packaging in a cool, dry and well-ventilated area.

Keep the product away from:

• Direct sunlight

• Heat sources

• Open flames

• High humidity

• Excessive pressure

• Premature expansion temperatures

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

Frequently Asked Questions

What is SY819?

SY819 is a thermally expandable polymer microsphere used as a physical blowing agent and lightweight polymer additive.

What is the particle size of SY819?

The average particle size is approximately 27 μm, with a particle size range of 20–35 μm.

What is the solid content?

The solid content is greater than 97%.

What is the appearance of SY819?

SY819 is supplied as a white powder.

At what temperature does SY819 start expanding?

The expansion start temperature is approximately 145–150°C.

What is the maximum expansion temperature?

The maximum expansion temperature is approximately 190–200°C.

What happens when SY819 is heated?

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

Can SY819 reduce product weight?

Yes. The expanded hollow microspheres can reduce the density and weight of compatible polymer materials.

What materials can be used with SY819?

SY819 can be evaluated in PVC, EVA, PE, PP, TPE, TPR, TPU, EPDM, rubber, coatings, adhesives and other compatible systems.

Can SY819 be used in extrusion?

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

Can SY819 be used for injection molding?

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

Can SY819 be combined with chemical blowing agents?

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

Is application testing necessary?

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

Request SY819 Samples and Technical Information

Contact Shanghai SanYu Biotechnology Co., Ltd. for SY819 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