70um Spacer PMMA Microspheres PAPMMA70UM

70um Spacer PMMA Microspheres PAPMMA70UM

SHBC PAPMMA70UM are precision 70 μm PMMA microspheres designed for adhesive bond-line control, component spacing and uniform gap formation.

The spherical polymer particles can be evaluated in adhesives, optical components, sensors, electronic modules, functional coatings and precision assemblies.

Product Specifications

Batch-specific particle size, size distribution, solid content, supply form, packaging and storage information are available in the product specification and Certificate of Analysis.

Key Advantages

Controlled 70 μm Spacing

The nominal particle diameter helps maintain an approximately 70 μm separation between bonded surfaces.

Uniform Spherical Morphology

Regular spherical particles provide stable support points and help reduce local bond-line variation.

Controlled Particle Sizing

Consistent particle sizing supports repeatable gap and adhesive-thickness control.

PMMA Polymer Material

PMMA provides a lightweight polymer spacer option for adhesive, optical and electronic material systems.

Smooth Particle Surface

The smooth morphology supports distribution in compatible adhesives, coatings, resins and polymer formulations.

Custom and Bulk Supply

SHBC supports sample evaluation, customized specifications, pilot orders and bulk production.

Main Applications

Adhesive Bond-Line Control

PAPMMA70UM can be dispersed in compatible adhesives to help maintain an approximately 70 μm bond line.

Optical Component Assembly

Suitable for controlling spacing between glass substrates, filters, lenses, optical films and imaging components.

Electronic Component Assembly

Can be evaluated for precision bonding of circuit components, substrates, modules and housings.

Sensor Manufacturing

Suitable for controlling separation between electrodes, substrates and sensor components.

Camera and Imaging Modules

Can help control adhesive thickness and component spacing in selected optical assemblies.

Semiconductor Packaging

Can be evaluated for spacing between substrates, packages and supporting electronic components.

Functional Films and Coatings

Suitable for compatible optical films, functional coatings and resin systems requiring uniform particles.

How 70um PMMA Spacer Microspheres Work

PAPMMA70UM microspheres are dispersed in an adhesive, coating or compatible carrier.

During assembly, the particles form physical support points between two surfaces. Their nominal diameter helps limit excessive compression and maintain the required separation.

The final gap may also depend on:

• Mean particle diameter

• Maximum particle diameter

• Particle size distribution

• Microsphere loading

• Adhesive viscosity

• Dispersion uniformity

• Assembly pressure

• Substrate flatness

Product Benefits

PAPMMA70UM helps provide:

• Controlled 70 μm spacing

• More uniform bond-line thickness

• Stable support-point distribution

• Reduced local gap variation

• Improved component alignment

• Repeatable assembly performance

• Customized particle specifications

• Reliable industrial supply

Application Methods

Adhesive Mixing

Mix the microspheres into compatible epoxy, acrylic, UV-curable adhesive, silicone or other polymer systems.

Wet Dispersion

Disperse the particles in a compatible solvent or liquid carrier before coating or spraying.

Surface Distribution

Apply the microspheres to the substrate using suitable precision distribution equipment.

Coating Formulation

Incorporate PAPMMA70UM into compatible optical, functional or protective coating systems.

The application method should be selected according to the substrate, formulation and required support-point density.

Dispersion and Processing Guide

Uniform dispersion is important for consistent gap control.

Recommended processing considerations include:

• Confirm material compatibility

• Premix before application

• Use gentle mechanical stirring

• Minimize air and bubble formation

• Avoid particle aggregation

• Evaluate particle settling

• Maintain consistent assembly pressure

• Validate the final bond-line thickness

Controlled ultrasonication may be used when compatible with the formulation and equipment.

Spacer Loading Considerations

The recommended particle concentration depends on the bonding area, adhesive volume and required support-point density.

Insufficient loading may result in uneven spacing. Excessive loading may affect adhesive flow, dispensing performance or bond strength.

Evaluate:

• Particle dispersion

• Support-point density

• Particle settling

• Adhesive viscosity

• Dispensing stability

• Final gap thickness

• Bond strength

• Long-term compatibility

Process validation is recommended before production use.

PMMA vs. Inorganic Spacer Particles

PMMA microspheres provide a polymer-based alternative to rigid glass or silica spacer materials.

They can be evaluated when the application requires:

• Lower particle density

• Polymer-system compatibility

• Reduced contact hardness

• Limited particle deformation

• Customized particle dimensions

• Dry powder or suspension supply

Mechanical, thermal and chemical compatibility should be confirmed in the final application.

How to Select PAPMMA70UM

Consider the following factors:

• Target gap thickness

• Mean particle diameter

• Maximum particle diameter

• Particle size tolerance

• Particle size distribution

• Adhesive or carrier chemistry

• Dispensing method

• Assembly pressure

• Operating temperature

• Required bond strength

For strict bond-line control, both the mean diameter and maximum particle diameter should be evaluated.

Custom PMMA Spacer Microspheres

SHBC can customize PMMA spacer microspheres according to project requirements.

Customization options may include:

• Custom particle diameter

• Particle size tolerance

• Particle size distribution

• Solid content

• Dispersion medium

• Surface modification

• Dry powder or suspension

• Custom packaging

• OEM and ODM supply

Please provide the target gap, application, adhesive system and required quantity when requesting customization.

Quality Control and Documents

Available product documents may include:

• Certificate of Analysis

• Technical Data Sheet

• Safety Data Sheet

• Particle size test report

• Particle size distribution data

• Microscopy images

• Batch inspection record

• Customized specification sheet

Why Choose SHBC?

Shanghai SanYu Biotechnology Co., Ltd. supplies polymer microspheres, silica microspheres, magnetic beads and functional particle materials.

SHBC provides:

• Precision microsphere manufacturing

• Stable batch-to-batch quality

• Multiple particle-size options

• Customized specifications

• Sample evaluation support

• Pilot-scale production

• Bulk manufacturing capability

• OEM and ODM services

Frequently Asked Questions

What are PAPMMA70UM microspheres?

PAPMMA70UM are nominal 70 μm PMMA microspheres designed for precision gap and bond-line thickness control.

What are 70um PMMA spacer microspheres used for?

They can be evaluated for adhesives, optical components, sensors, electronic modules, semiconductor packaging and precision assemblies.

Can PAPMMA70UM create an exact 70 μm gap?

The nominal particle diameter helps control the gap. Final thickness also depends on particle size distribution, maximum diameter, loading, adhesive properties and assembly pressure.

Can PAPMMA70UM be mixed into epoxy adhesives?

Yes. They can be evaluated in compatible epoxy, acrylic, UV-curable adhesive, silicone and other polymer systems.

Why use PMMA instead of glass spacers?

PMMA provides a lower-density polymer option with reduced contact hardness and limited deformation under pressure.

How should the microspheres be dispersed?

Use gentle mechanical stirring or compatible ultrasonication while minimizing bubbles and particle aggregation.

Will the particles affect adhesive performance?

Particle loading and dispersion may affect viscosity, dispensing and bond strength. Compatibility testing is recommended.

Can SHBC customize PAPMMA70UM?

Yes. Particle diameter, size tolerance, solid content, dispersion medium, surface properties and packaging can be customized.

Are samples and bulk quantities available?

Yes. SHBC supports laboratory samples, pilot orders and long-term bulk supply.

Request a Sample or Quotation

Contact SHBC for PAPMMA70UM samples, technical specifications, customized PMMA spacer microspheres and bulk pricing.

Please provide:

• Target application

• Required gap thickness

• Adhesive or carrier system

• Required quantity

• Preferred supply form

• Packaging requirements

• Estimated annual demand

Product: 70um Spacer PMMA Microspheres
Catalog Number: PAPMMA70UM
Material: Polymethyl Methacrylate, PMMA
Nominal Particle Size: 70 μm
Brand: SHBC
Manufacturer: Shanghai SanYu Biotechnology Co., Ltd.