400um Spacer PMMA Microspheres PAPMMA400UM 10%

400um Spacer PMMA Microspheres PAPMMA400UM

SHBC PAPMMA400UM are precision 400 μm PMMA microspheres designed for large-gap control, adhesive bond-line spacing and industrial component assembly.

The nominal particle diameter is equal to 0.4 mm. The spherical particles provide physical support between bonded surfaces and help maintain a more uniform separation.

Product Specifications

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

Key Advantages

Controlled 400 μm Spacing

The nominal particle diameter helps maintain an approximately 400 μm gap between bonded 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 gap control and assembly performance.

PMMA Polymer Material

PMMA provides a lightweight polymer alternative to rigid glass, silica or metal spacer particles.

Reduced Contact Hardness

Polymer particles can provide lower contact hardness than many inorganic spacer materials.

Custom and Bulk Supply

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

Main Applications

Adhesive Bond-Line Control

PAPMMA400UM can be added to compatible adhesives or sealants to help maintain an approximately 0.4 mm bond line.

Electronic Module Assembly

Suitable for spacing between substrates, circuit components, housings and electronic modules.

Sensor Housing Bonding

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

Optical Housing Assembly

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

Industrial Component Bonding

Can be used in fixtures, enclosures and mechanical components requiring repeatable spacing.

Resin Thickness Control

Suitable as a physical spacer in compatible resins, coatings and composite material systems.

Prototype and Test Fixtures

Can be evaluated in product development, material testing and laboratory assembly projects.

How 400um PMMA Spacer Microspheres Work

PAPMMA400UM 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

PAPMMA400UM helps provide:

• Controlled 400 μm spacing

• More uniform bond-line thickness

• Stable support-point distribution

• Reduced local gap variation

• Improved component alignment

• Repeatable assembly processes

• Customized particle specifications

• Reliable industrial supply

Application Methods

Adhesive Mixing

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

Direct Surface Distribution

Distribute the particles 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 PAPMMA400UM 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 bond-line thickness

Because the particles are 400 μm in diameter, the dispensing nozzle, pump and complete material path must be sufficiently larger than the particles.

Particle Settling Considerations

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

Recommended controls include:

• Select a suitable formulation viscosity

• Mix before dispensing

• Minimize holding time

• Maintain uniform suspension

• Check particle distribution

• Validate dispensing consistency

Production testing should be completed using the final adhesive 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, surface contact or bond strength.

Evaluate:

• Particle distribution

• Support-point density

• 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.

They can be considered when the application requires:

• 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 application.

How to Select PAPMMA400UM

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 temperature

• Required bond strength

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

• 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 PAPMMA400UM microspheres?

PAPMMA400UM are nominal 400 μm, or 0.4 mm, PMMA microspheres designed for large-gap and bond-line thickness control.

What are 400um PMMA spacer microspheres used for?

They can be evaluated for adhesives, electronic modules, sensors, optical housings and industrial component assemblies.

Can PAPMMA400UM create an exact 400 μm gap?

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

Can PAPMMA400UM be mixed into epoxy adhesives?

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

Why use PMMA spacer particles?

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

Will PAPMMA400UM settle in the adhesive?

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

Can the particles pass through dispensing equipment?

The nozzle, pump and complete material path must be sufficiently larger than the 400 μm particles.

How much PAPMMA400UM should be added?

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

Can SHBC customize PAPMMA400UM?

Yes. Particle diameter, size tolerance, solid content, 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 PAPMMA400UM 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: 400um Spacer PMMA Microspheres
Catalog Number: PAPMMA400UM
Material: Polymethyl Methacrylate, PMMA
Nominal Particle Size: 400 μm / 0.4 mm
Brand: SHBC
Manufacturer: Shanghai SanYu Biotechnology Co., Ltd.