Solutions · Rubber Recycling
Crumb rubber is elastic, compressible, and often contains residual fibers – properties that decide how a rubber silo must be built. PW Silo Systems designs aluminum and stainless steel silos for crumb rubber, rubber granulate, and rubber powder with you.
Crumb Rubber Storage at a Glance
A crumb rubber silo stores rubber granulate, rubber powder, or EPDM granules from tire and rubber recycling – as a buffer after granulation, for sports and play surfaces, molded rubber products, rubber-modified asphalt, or compounding. It keeps the material contained and feeds it in a controlled way to bagging, mixing, or production.
Rubber particles are elastic and compress under the weight of the silo content. Residual textile fibers and fine dust from granulation make discharge more demanding. Silo geometry and discharge are therefore designed together with you for your material.
Why Crumb Rubber Is Demanding
Elastic particles, residual fibers, and dust decide whether a rubber silo runs reliably.
Rubber particles are elastic. Under the weight of the silo content they compact and can build bridges at the outlet.
Granulate from tire recycling can contain residual textile fibers that interlock and block the outlet.
Rubber powder and fines from granulation spread during pneumatic filling and conveying.
Venting, filtration, and explosion protection depend on particle size and product.
Mesh sizes, colors, and EPDM granules must not be mixed by accident.
In funnel flow, granulate can stay in the silo for a long time while fresh material passes through the center.
Silo Materials
We build silos exclusively in aluminum and stainless steel. Carbon steel is not an option for us: its coating is the only protection against corrosion – and flaking coating or rust can end up in your product.
Which of our two materials fits your crumb rubber silo depends on the material, your process, and your site. We select the material and the design with you.
Your Crumb Rubber Silo System
Silo, discharge, blending, filtration, and monitoring are engineered as one system. That means fewer interfaces for your team and components that are designed to work together.
Storage
Concentric mass-flow discharge without asymmetric flow zones – as standard, site-assembled, indoor, or multi-compartment silos.
Learn moreBlending
Gravity blending and homogenizing with four technologies, including PW ConeBlend with a hopper that is quick to clean.
Learn moreDischarge
Vibration from unbalanced motors breaks up cohesive forces, resolves caking, and keeps the outlet clear.
Learn moreDischarge
Air fluidization for uniform discharge of poorly flowing products – prevents bridging and can be retrofitted to existing silos.
Learn moreFiltration
Dust separation during pneumatic filling and conveying – sized for fine powders.
Learn moreMonitoring
Level measurement for reliable monitoring of the silo content – so you know when to reorder.
Learn moreRecycled Rubber & Elastomers
Products marked “Tested in our lab” are on our list of bulk materials. The others we review with you based on your material data before designing the silo.
Review with us
Crumb rubber, rubber granulate, rubber crumb
Crumb rubber varies with its source and mesh size. We review your material data with you before designing the silo.
Review with us
Rubber powder, ground rubber, fine mesh rubber
Fine rubber powder dusts more and flows differently from granulate. We review flow behavior and dust collection with you.
Review with us
Tire-derived granulate, recycled tire rubber
Tire granulate can contain residual fibers. Fiber content is considered in the outlet and discharge design.
Review with us
EPDM granules, colored rubber granules
Colored EPDM granules require clear product separation. We review your products with you.
Tested in our lab
TPU pellets, thermoplastic polyurethane
TPU pellets are on our list of bulk materials tested in our lab. Silo and discharge are designed for elastic pellets.
Tested in our lab
Carbon black, rubber-grade carbon black
Carbon black – a key filler in rubber compounds – is on our tested list. A closed system keeps black dust contained.
Also tested in our lab:
Send us your material data and we will review the right solution with you:
Material Check
Type in your rubber product or any other bulk material to see whether it has already been tested in our lab. The list covers 287 bulk materials.
Try: , ,
Service in the U.S.
With more than 40 years of experience in silo engineering, we support your crumb rubber silo project from the first design discussion to commissioning. We deliver to every U.S. state and install with our own qualified personnel.
FAQ
Answers to the questions plant managers, engineers, and buyers ask most often about storing crumb rubber and rubber granulate in silos.
Yes – with a silo and discharge designed for elastic, compressible particles. Related products on our list of bulk materials tested in our lab:
Crumb rubber, rubber powder, tire granulate, and EPDM granules we review with you based on your material data.
Rubber particles are elastic and compress under the weight of the silo content. Residual fibers can interlock. A mass-flow hopper geometry, the right outlet size, and discharge aids such as bin activators keep the material moving. The right combination depends on your material.
Yes. Fibers can interlock and block the outlet. Tell us about the fiber content of your granulate – we consider it in the outlet and discharge design.
Whether venting and explosion protection are required depends on particle size, dust content, and your site. We review the safety concept with you where your product requires it.
In mass flow, the entire silo content moves downward when material is discharged – not just a channel in the center. Your crumb rubber leaves the silo in the order it came in (first in, first out), and no product is left behind in dead zones. Our PW StoreLine silos are designed for concentric mass-flow discharge without asymmetric flow zones.
Integrated filters and PW FilterLine dust collectors separate dust during pneumatic filling and conveying. Filter size and venting are matched to your filling rate and your material.
The right size depends on your daily consumption, delivery intervals, the number of products, and the space available at your site. PW StoreLine silos are available in a wide range of sizes and diameters, and silos too large for road transport are assembled on site. We size the system with you – without oversized investment.
Yes. We deliver to every U.S. state and support your project with silo transport, field assembly, silo installation and supervision, and site relocation of existing systems.
Very likely. Our silo systems are designed for nearly all free-flowing, granular, and powdered bulk solids. Send us your material details – mesh size, bulk density, fiber content, and how the product is filled and discharged – and we will review the right storage solution with you.
Tell us about your products, required storage capacity, how the silo is filled and discharged, and your site conditions. Based on this, we work out the material, silo type, and configuration with you and send you a detailed quote.
