900um Spacer PMMA Microspheres PAPM900UM 10%

900um Spacer PMMA Microspheres PAPM900UM

SHBC PAPM900UM are 900 μm PMMA microspheres designed for large-gap control, adhesive bond-line spacing and industrial component assembly.

The nominal particle diameter is equal to 0.9 mm. The spherical polymer particles form physical support points between assembled surfaces and help maintain a more uniform separation.

Product Specifications

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

Key Advantages

Controlled 0.9 mm Spacing

The nominal particle diameter helps maintain an approximately 0.9 mm gap between assembled surfaces.

Uniform Spherical Morphology

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

Consistent Particle Sizing

Controlled particle dimensions support repeatable adhesive thickness and component spacing.

Lightweight PMMA Material

PMMA provides a polymer-based alternative to rigid glass, ceramic or metal spacer particles.

Reduced Contact Hardness

Polymer particles can reduce direct contact between sensitive substrates during assembly.

Custom and Bulk Supply

SHBC supports sample evaluation, customized specifications, pilot orders and industrial-scale production.

Main Applications

Large-Gap Adhesive Bonding

PAPMMA900UM can be added to compatible adhesives or sealants to help maintain an approximately 0.9 mm bond line.

Electronic Enclosure Assembly

Suitable for spacing between circuit boards, substrates, housings and supporting components.

Sensor Housing Bonding

Can be evaluated for controlling separation between sensor substrates, electrodes and protective housings.

Optical Housing Assembly

Suitable for selected glass components, optical housings, filters and imaging assemblies requiring a larger gap.

Industrial Component Bonding

Can be used in fixtures, mechanical parts, covers and industrial modules requiring repeatable spacing.

Resin Thickness Control

Suitable as a physical spacer in compatible resin, coating and composite systems.

Prototype and Test Fixtures

Can be evaluated in product development, laboratory fixtures and precision assembly testing.

How 900um PMMA Spacer Microspheres Work

PAPM900UM microspheres are distributed in an adhesive, sealant, resin or compatible carrier.

During assembly, the particles form 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

• Particle loading

• Adhesive viscosity

• Particle dispersion

• Assembly pressure

• Substrate flatness

• Particle deformation

Product Benefits

PAPMMA900UM helps provide:

• Controlled 900 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 bulk supply

Application Methods

Adhesive Mixing

Mix the particles into compatible epoxy, acrylic, silicone, polyurethane adhesive or sealant systems.

Direct Surface Distribution

Distribute the microspheres onto the substrate before adhesive curing or component assembly.

Wet Dispersion

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

Resin Formulation

Incorporate PAPMMA900UM into compatible resin or composite systems requiring controlled spacing.

Dispersion and Processing Guide

Uniform particle distribution is important for consistent gap control.

Recommended processing considerations include:

• Confirm material compatibility

• Premix before dispensing

• Use gentle mechanical stirring

• Minimize bubbles and air introduction

• Avoid particle aggregation

• Evaluate particle settling

• Maintain consistent assembly pressure

• Validate the final gap thickness

Because the particles are 900 μm in diameter, fine dispensing equipment is generally unsuitable.

The nozzle, pump, valve and complete material path must be sufficiently larger than the particles to reduce blockage and particle damage.

Particle Settling Control

Large PMMA particles may settle in low-viscosity adhesives or liquid carriers.

Recommended controls include:

• Select a suitable formulation viscosity

• Mix before dispensing

• Minimize material holding time

• Maintain uniform particle suspension

• Inspect particle distribution

• Validate dispensing consistency

Testing should be completed using the final adhesive, substrate and production equipment.

Spacer Loading Considerations

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

Insufficient loading may produce uneven spacing. Excessive loading may affect adhesive flow, surface contact or bond strength.

Evaluate:

• Support-point density

• Particle distribution

• Adhesive viscosity

• Particle settling

• Dispensing performance

• Final gap thickness

• Bond strength

• Long-term stability

PMMA vs. Inorganic Spacer Particles

PMMA microspheres provide a polymer-based spacing option for applications requiring:

• Lower particle density

• Polymer-system compatibility

• Reduced contact hardness

• Limited deformation under pressure

• Electrical insulation

• Customized particle dimensions

• Dry powder or suspension supply

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

How to Select PAPM900UM

Consider the following factors:

• Required gap thickness

• Mean particle diameter

• Maximum particle diameter

• Particle size tolerance

• Particle size distribution

• Adhesive chemistry

• Adhesive viscosity

• Dispensing equipment

• Assembly pressure

• Operating environment

For strict gap control, both 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

• Crosslinking level

• Solid content

• Dispersion medium

• Surface modification

• Dry powder or suspension

• Custom packaging

• OEM and ODM supply

Please provide the target gap, adhesive system, application 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 PAPMMA900UM microspheres?

PAPMMA900UM are nominal 900 μm, or 0.9 mm, PMMA microspheres designed for large-gap and bond-line thickness control.

What are 900um PMMA spacer microspheres used for?

They can be evaluated for industrial adhesives, electronic enclosures, sensor housings, optical assemblies, resins and mechanical components.

Can PAPM900UM create an exact 0.9 mm gap?

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

Can PAPM900UM be mixed into epoxy adhesives?

Yes. They can be evaluated in compatible epoxy, acrylic, silicone, polyurethane adhesive and sealant systems.

Will the particles settle in the adhesive?

Settling may occur in low-viscosity formulations. Adhesive viscosity, mixing method and dispensing time should be evaluated.

Can PAPM900UM pass through dispensing equipment?

Fine nozzles are generally unsuitable. The complete material path must be sufficiently larger than the 900 μm particles.

How much PAPM900UM should be added?

The loading depends on the bonding area, adhesive volume and required number of support points.

Why use PMMA spacer particles?

PMMA provides a lightweight polymer spacing option with lower contact hardness than many rigid inorganic particles.

Can SHBC customize PAPMMA900UM?

Yes. Particle diameter, size tolerance, crosslinking level, supply form, 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 PAPMMA900UM 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: 900um Spacer PMMA Microspheres
Catalog Number: PAPM900UM
Material: Polymethyl Methacrylate, PMMA
Nominal Particle Size: 900 μm / 0.9 mm
Brand: SHBC
Manufacturer: Shanghai SanYu Biotechnology Co., Ltd.