Specialty Glass Microfiber

Specialty glass microfiber media have unique material properties that may include: binderless, acrylic binder, organic binder, laminated, double laminated and hydrophobic. They also have efficiencies that range from medium to ultra high. Specific applications are listed in the specialty glass microfiber grade descriptions below.

Download Specialty Glass Microfiber Filter Media Charts

Pre-Filtered Binderless Glass Microfiber

New Product Alert - 2019 -  The I.W. Tremont MultiDensity™ 1000 Pre-Filtered Binderless Glass Microfiber

The wavy pattern of the MultiDensity™ Filter Disk easily distinguishes the sample introduction side

The MultiDensity™ product platform now includes this easy to use, thinner¹ binderless glass microfiber filter which retains solids in a broad size range.  Larger solids become entrapped on the built in pre-filter layer allowing the multiple density zones of filter to entrap finer solids rapidly and reliably.  This yields a faster flow rate with higher fluidic capacity.  The borosilicate glass is highly resistive to aggressive solvents, acids² and base with a usable range of 0-14pH and a wide effective temperature range of -200 to 500°C. ³

• Up to 4x capacity of traditional glass microfiber filters in same porosity range
  • Handles larger sample volumes or samples with higher ratio of solids.
  • Less frequent filter changes = fewer variables in sample prep.
• 100% binderless glass microfiber, formed to create a built-in pre-filter
  • Lower extractables for better quality analysis.
  • Wide ranging chemical compatibility borosilicate glass
• Finely controlled porosity for consistent and reproducible results
  • Extends the life of a membrane when used in series.
  • Disk to disk results are consistent.
• Laser cut for decreased fiber shedding and increased handling stability
  • Fibers on cutline are fused together to form an easy to handle disk.
  • Fewer extraneous fibers to wash out into filtrate
• This material is offered in custom product variants and OEM.

Closest Known Competitive Cross Reference*:

GE Whatman GMF150

Note:

1. It is a thinner version than the standard MultiDensity™ filter which has a caliper thickness of 2.5 - 3.5mm and was designed to filter the most challenging samples.
2. Borosilicate glass microfiber filters are not compatible with hydrofluoric acid.
3. Maximum working temperature is <500°C. Borosilicate glass microfiber filters may become brittle and susceptible to cracking at < -100°C.

Click here to download MultiDensity™ Pre-filtered Binderless Glass Microfiber product literature

New Product Alert - 2018 -  The I.W. Tremont MultiDensity™ Disk

Cross section of the new IW Tremont MultiDensity™ Filter Disk

Introducing the IW Tremont MultiDensity™  filter disk. This exciting new product is a 100% borosilicate binderless glass microfiber filter which demonstrates several layers of density along with a unique surface formation that speeds and optimizes filtration. These filter disks can handle sample preparation tasks typically considered too challenging for other analytical filter products. This unique product bridges the gap between macro and micro analytical filtration.

Click here to download MultiDensity™ product literature

Borosilicate Glass Microfiber Filter Media

D-23^® Whole Blood Separation Media: The Grade D-23® is a point of care diagnostics borosilicate glass microfiber filter media containing a proprietary acrylic binder system. This customizable material represents a platform of product variants. The base glass media is supplied ready for your application of chemistries. When supplied as a whole blood separator a novel coating technology is utilized which yields high quality plasma with surprising efficacy and no red cell Hemolysis . The coated version material has been developed by a CRO in the United States whose specialty is blood separation and device development. This market proven media is currently included as a component in successfully commercialized and patented devices with 510K filings.

Click here to download D23® product literature

Binderless Glass Microfiber Filter

NanoGF™ Grade A-83: Imagine the loading capacity of a binderless glass microfiber filter with the tightly regulated pore size of a microfiltration membrane.

Now it's possible with NanoGF™ Grade A83.

This new grade has a particle retention of 0.5µm.
It has >20x loading capacity of an equivalent porosity MCE or CN membrane and >15x the flow rate.

Back pressure is nearly non-existent in comparison to surface membranes.

Chemically inert, pure binderless borosilicate glass with no sizing additives or other surfactants. Low background noise in LC/GC/MS and very low extractables in presence of aggressive solvents.

There are many filter materials which make the claim of "nano-scale" fiber, but Grade A83 is tested by an independent laboratory using the latest in fiber analysis and SEM image quantification.

With >85% of the fiber content between 300nm -100nm, this material is truly one of the highest surface area binderless glass microfiber products on the market today.

Click here to download NanoGF™ Grade A-83 product literature

Binderless Filter Medium

B-85: This is a binderless, high efficiency (HEPA type) filter medium demonstrating retention rates of 1-2µm with high flow rate with high capacity. This media has been specifically designed for analytical applications and this borosilicate glass fiber media has no added extractables to aid in the elimination of sample contamination. Excellent wet strength. Common usage includes gravimetric analysis of air pollutants and membrane pre-filters. Also used for testing dissolved and suspended solids in wastewater.

Click here to download B-85 product literature

Multi-purpose Filter Medium

RG: This laminated glass product is a high efficiency multi-purpose filter medium with good heat resistance. Demonstrating a retention rate of 1-2µm, it is particularly recommended for both gas and liquid filtration in the medical field and for monitoring applications. The base material consists of glass microfibers with 3-7% acrylic resin binder. The supporting scrim is a 0.5 oz/yd2 Reemay, a high strength spun bonded polyester nonwoven. The scrim can be applied to either side depending on the filter design. Also, the scrim is bonded to the glass media using a polyester hot melt which has a melting point of 325° F. This media has become the standard for monitoring the air in and around nuclear reactors and materials.

Click here to download RG product literature

C-42: This is a high efficiency multi-purpose filter material demonstrating retention rates of 1-2µm with very good heat resistance. The basis weight and thickness are higher than normal to provide greater filter capacity. This grade is recommended for applications where some depth penetration and lower plugging rates are favored over surface removal of particulates. This material consists of borosilicate glass microfibers bonded with low amounts of acrylic resin.

Click here to download C-42 product literature

High Capacity Filter Medium

E-13: This is a medium efficiency, high capacity filter medium demonstrating retention rates of 10-12µm and is suitable for applications requiring high air porosity or rapid liquid filtration. This grade is made from a blend of borosilicate glass microfibers, which are bonded by an acrylic resin. It is recommended for ASHRAE applications in the efficiency range of 90-95%.

Click here to download E-13 product literature

Download Specialty Glass Microfiber Filter Media Charts

For ordering information on these grades

Material Specs

MultiDensity™ Filter Discs, Standard and Thinner Versions

Using a newly developed production method Tremont produces MultiDensity™ filters with a choice of final retention stages of <0.5μm to 2.7μm (the same as Tremont's binderless glass microfiber line of products).  A thinner MultiDensity™ Filter is now offered that offers faster flow rates.  The unique MultiDensity™ filter has a robust prefilter built-in which captures particulate from >300μm and binds typically difficult to filter substances without clogging such as:

• Lipids (natural oils and waxes)
• Petrochemical oils, tars
• Cellular matter
• Proteins
• Irregularly granular matter
• Viscous suspensions and slurries

The filter has been optimized to meet the extreme demands of high fluidic volume:
• Manifold vacuum filtration
• Short path extraction methods
• Positive pressure devices
• Structured devices such as inline filters & capsules

The flow and drainage rate is exceptionally rapid via its highly irregular surface formation which has high and low points that aid in the reduction of surface loading.

The unique fibers which sit on the outermost surface of the pre-filter side are designed to extend up and add further prefiltration structure similarly to glass floss. In standing solutions the prefilter side resists compaction causing surface plugging found in other common filter configurations.

The filter is free of binders, glues and resins which ensure a higher purity filtrate. These filters demonstrate very low extractables. This filter replaces multi pre-filtration stage products In applications where a series of prefilters are used to prepare sample prior to membrane filtration, saving time and reducing variability in extract signature upon analysis methods.

The borosilicate glass is highly resistive to aggressive solvents, acids* and base with a usable range of 0-14pH and a wide effective temperature range of -200 to 500 °C. **

The final filtration stage is available in the same porosity range of IW Tremont's binderless glass line, including the newly introduced Grade A-83 Nano-Scale filter.

*Borosilicate glass microfiber filters are not compatible with hydrofluoric acid.
**Borosilicate glass microfiber filters may become more brittle and susceptible to cracking at <-100°C.

The unique irregular and highly tortuous prefilter surface enables rapid drainage rates and reduces surface plugging.

Fluidic volume capacity to diameter relationship example...food sciences: (H2O + 20% tomato paste solution homogenized, 1.5 μm final retention,
2-3bar vacuum, 15 °c)

NanoGF™ Grade A-83: 

This new grade has a particle retention of 0.5µm, similar to popular membrane filters but with >20x loading capacity of an equivalent porosity MCE or CN membrane and >15x the flow rate.

Back pressure is nearly non-existent in comparison to surface membranes.  Many filter materials claim "nano-scale" fiber, Grade A83 is tested and confirmed by an independent laboratory using the latest in fiber analysis and SEM image quantification.  More than 85% of the fiber content is between 300nm -100nm making A-83 material one of the highest surface area binderless glass microfiber products on the market today.

Composed only of chemically inert, pure binderless borosilicate glass with no sizing additives or other surfacants, it offers low background noise in LC/GC/MS and very low extractables in presence of aggressive solvents.

Click here to download A-83 product literature

D-23^® Whole Blood Separation Media

This naturally hydrophilic material demonstrates high uniformity in formation and density allowing reliable migration rates, in both cross and lateral flow applications. With little caliper deviation the media is ideal for challenging lamination applications and micro fluidic devices.

Uniform screen & felt sides with consistent density MD/CD - This media demonstrates excellent lot-to-lot reproducibility - CofC and CofA provided with shipments – Manufactured in an FDA approved facility and available as rolls, reels, sheets and semi-finished converted configurations in both pre and post coated versions.

This media is available as a base glass microfiber which performs basic whole blood separation via precisely engineered porosity and fiber matrix. In this configuration the material demonstrates plasma yield of approximately 15% by volume at nominal Hct range. It is suitable for both lateral and cross flow configurations and is highly consistent in density and caliper for application of your own micro-coating and dip/dry saturation chemistry.

The D23^® series of whole blood separating material is currently available in a total of 8 different iterations.   

The material in basic form (commonly referred to as “base glass”) separates the plasma strictly through precision filtration and capillary flow:.  Six versions of the blood separation media containing proprietary agglutinating chemistry coating are also available. In this coated version this material demonstrates plasma yield >40%.

• D23® is the thickest, most robust glass microfiber (highest fluidic volume capacity)
• D23-TC1® is a thinner, faster version of the glass microfiber (faster with lower dead volume)

Coated with high yield agglutinating process chemistry, LATERAL FLOW

• LF-D23-X1 (thick version, designed for nominal Hct range, lateral flow)
• LF-D23-X2 (thick version, designed for high Hct range, lateral flow)
• LF-D23-TC1-X1 (thin version, designed for nominal Hct range, lateral flow
• LF-D23-TC1-X2 (thin version, designed for high Hct range, lateral flow)

Coated with high yield agglutinating process chemistry, CROSS FLOW

• CF-D23-X1 (thick version, designed for nominal Hct range, cross flow vertical applications)
• CF-D23-TC1-X1 (thin version, designed for nominal Hct range, cross flow vertical applications)

Click here to download D23® product literature

Products

Capabilities

OEM and Custom Manufacturing

In addition to Tremont's significant standard production of analytical, laboratory and diagnostic products, we offer our services as your manufacturing partner.  

By utilizing a wide array of disciplines and resources we can modify an existing design or completely develop a new product or process. Cost efficiency is created with tight controls in timeline, budget, concurrent processes and production scale. We efficiently develop a viable early stage engineering plan to bring the project to your desired level of completion including short run, scale up and full commercialization.

Core capabilities:

• Wet lay processes for glass microfiber and cellulose media development
• Porous media development including modification of standard grades
• Hundreds of standard material grades in glass, cellulose and synthetics
• Converting such as slitting, die cutting, shearing, laminating & interleaving
• Component design for injection molding
• Component assembly using ultrasonic welding
• Inspection, insertion and encapsulation
• Device optimization and process consulting
• Short run to mid-volume manual operations
• Custom syringe and inline filter devices with integrity testing
• Kitting and special packaging
• ISO Class 8 & 9 clean room assembly and production

Partnered capabilities:

• Paper chemistry and pilot production
• Lateral flow device design and development
• Point of care device design
• Test strip production
• Micro gravure coating
• Rapid whole blood separation technologies
• Microfluidic device design