Lightweight fillers for the building & construction industry

Last update on Aug 10, 2025
Lightweight fillers are used extensively in applications such as joint compounds, insulating paints, elastomeric roof and high reflective coatings, polyester putties, adhesives and sealants, mastics, underbody coatings, and many cementitious applications such as tile adhesives, renders, grouts, insulating mortar, and structural concrete. The fillers provide benefits including reduced weight of final products, increased yield / coverage, enhanced rheological properties such as sag resistance or sandability, and improved insulating properties such as emittance, reflectivity, and thermal conductivity. All of these benefits lead to clear and tangible savings while improving the application of the final product.

Lightweight fillers for the building & construction industry


Omya's lightweight fillers are unique: more cost-efficient because of lower density, tailored size distribution and surface treatment, consistent optical properties, and better strength. 

Lightweight fillers from Omya are not just ingredients, they are a promise of continuous innovation for several applications. 

Based on their low effective density Omya lightweight fillers are able to reduce the weight of the final product while creating additional benefits such as improved insulation properties which create energy savings and enhanced rheological properties leading to easy application.

 

Omyasphere 200 series:

 

Based on closed-cell expanded perlite are suitable for hand, roller, or brush applications and can even be used in low-pressure spraying operations (e.g. tile adhesives, joint compounds, renders, plasters, self-leveling, roof coatings, insulating paints). There is a large portfolio of grades with a top cut ranging from 120 to 500 microns, and grades coated for reducing hydrophobicity and improving stability over time in ready-to-use systems.
 

 

Meeting the Growing Demand for Lightweight Fillers

 

Demand for lightweight fillers is increasing globally because of their benefits. Formulators add these fillers to their formulations to create lightweight structures. These engineered fillers were developed through decades of research to overcome product durability, strength, functionality, and overall quality challenges. Omya's team of experts has many years of market experience and can help find the ideal solution for your technical challenges. They have developed the fillers from chemically inert materials offering peace of mind and a comfortable environment. The production units can meet bulk requirements for lightweight fillers.



 

 

Lightweight Fillers Make your Life Easier

 

Comfort Boost Technology inspired by Omya's unique production process offers an exceptional portfolio of lightweight fillers for the construction industry. The most advantageous feature is a drastic reduction of weight achieved by expanded particles. Key factors to select the correct lightweight filler for specific applications include:

  • Particle size distribution
  • Shape and structure of the particle
  • Surface treatment
  • Compressive strength
  • Final density

 

Lightweight Filler Relative Positioning According to Strength and Density
Lightweight Filler


 

Applications Overview

 


Omyasphere Product Series Recommendations

 

Main ApplicationsOmyasphere 200 series
(Closed-cell Expanded Perlite)
Spackles✓ ✓
Joint Compounds/Joint Fillers✓ ✓
Plasters & Renders✓ ✓
Ceramic Tiles Adhesives✓ ✓
Panels & Boards✓ ✓
Elastomeric Roof Coating✓ ✓
Waterproofing Asphalt Membranes✓ ✓
Adhesives & Sealants✓ 
Architectural Paints✓ 
Industrial Coatings✓ 



Find out more detailed information on each technology:


 

Omyasphere 200 series

Omyasphere 200 series, based on closed-cell expanded perlite are suitable for hand, roller, or brush applications and can even be used in low-pressure spraying operations (e.g. tile adhesives, joint compounds, renders, plasters, self-leveling, roof coatings, insulating paints, waterproofing mortars, putties, mastics, adhesives). There is a large portfolio of grades with a top cut ranging from 120 to 500 microns, and grades coated to reduce hydrophobicity and improve stability over time in ready-to-use systems.


Omyasphere 200 series Properties and advantages 

 

PropertiesAdvantages
Closed-cell based lightweight fillersLow water and binder requirement. 
Improved sag resistance and outstanding workability
Low densityWeight reduction & high yield 
Less weight per volume unit of product applied 
Lower environmental emissions in the transportation of finished goods
Hydrophobic surface treatmentStorage stability & long shelf life
Low surface to volume ratioBetter dimensional stability; crack reduction, low
shrinkage
Low thermal conductivityEnhanced insulation properties



 

Applications

The selection of lightweight materials is driven by many factors. Each of these have a direct impact on the final system: application, manufacturing process, particle size and crush resistance needs, optical properties, temperature resistance, cost-in-use but crush strength is normally the key factor that drives material choice. If the final product is not under high shear production or high pressure spraying operations then Omyasphere 200 series, based on closed cell expanded perlite, is the most suitable choice. On the other hand if the manufacturing process or application includes high shear of high pressure then Omyasphere 900 series, based on hollow glass microspheres, is the most suitable.



 

Positioning Omyasphere Series



 

Positioning Omyasphere Series


 

Omyasphere 200 series is a lightweight filler based on closed-cell expanded perlite. Its low density allows strong weight reduction in final systems together with a significant yield improvement. The closed-cell structure combined with surface treatment allow reduced water absorption leading to excellent stability in the final system. Moreover, Omyasphere 200 series will enhance all insulating properties in the final system.


 

The main highlights of Omyasphere 200 series:


 

  • Closed-cell microspheres
  • Low density
  • Controlled top cut
  • Chemically and temperature stable
  • High & consistent brightness
highlights of Omyasphere 200 series


 

The primary applications include joint fillers and spackles, plasters, ceramic tile adhesives, elastomeric roof coatings, waterproofing asphalt membranes, putties, mastics, adhesives, flooring. The benefits of using Omyasphere 200 for each main application is given below:


 

ApplicationsBenefits
Join Compounds & Join Fillers & Spackles
  • Weight reduction for same spread rate and higher yield leads to transportation savings
  • Improved workability and sag resistance
  • Better sandability leads to easier and faster application
  • Less cracking allowing thicker coats
  • Improved long term stability
Plasters & Renders
  • Higher yield leads to tangible transportation savings
  • More layer thickness with reduced cracking
  • Improved sag resistance and enhanced workability leads to easier and faster application
Ceramic Tile Adhesives
  • Weight reduction at the same spread rate leads to safer handling
  • Higher yield leads to tangible transportation savings
  • Improved workability and enhanced sag resistance leads to easier and faster tiling operations
Elastomeric Roof Coatings & Thermal Insulating Paints
  • Higher yield and weight reduction leads to transportation savings
  • Increased coating thickness
  • Enhanced flexibility
  • Thermal conductivity reduction
  • Improved Solar Reflectivity Index
  • Lower ageing / weathering
Waterproofing Asphalt Membranes
  • Weight reduction leads to transportation savings
  • Increased yield leads to lower costs / m2
  • Enhanced bitumen modification properties (viscosity, penetration, etc.)
  • Improved flexibility and ageing at low temperature
Panels & Boards
  • Weight reduction and higher yield leads to clear and tangible transportation savings
  • Improved thermal properties
  • Easier to cut leads to easier and faster processing and installation
  • Higher flexibility and less cracking


 

highlights of Omyasphere 200 series



 

Our Portfolio and properties:

ProductsProperties
 D98 
(µm)
CoatingBulk Density
(kg/m3)
Effective density 
(g/cc)
Omyasphere 213 T - FQ130Yes1300,30
Omyasphere 220 - FQ200No1200,41
Omyasphere 220 T - FQ200Yes1200,27
Omyasphere 220 TM - FQ200Yes1700,30
Omyasphere 223 - FQ230No1200,41
Omyasphere 223 T - FQ230Yes1200,27
Omyasphere 227 - FQ270No1400,40
Omyasphere 227 T - FQ270Yes1400,27
Omyasphere 227 TM - FQ270Yes1400,27
Omyasphere 235 - FQ350No1000,38
Omyasphere 235 T - FQ350Yes1000,23
Omyasphere 235 TM - FQ350Yes1000,23