BUSS co-kneaders
Low, even shear and tight temperature control for heat-sensitive and highly filled compounds, including HFFR cable grades.
Polytolling® · Specialty toll compounding · Since 1980
Specialty toll compounding in France, for the formulations standard extrusion can't handle
The compounding step you were missing.
BUSS co-kneaders, twin-screw reactive extrusion, viscous liquid injection and non-dusting blends across 18+ lines in Normandy. We run your recipe under NDA, from lab trial to production campaigns, on the same line configuration and with the same team.
- 1980Since
- 18+Production lines
- 15+Years avg. key partnership
- NDABefore any technical exchange
- EUCany-Barville (FR)
How our partners describe us
The specialty compounder you call when standard extrusion isn't enough.
01/04
Why companies call us
Companies come to us for one of three reasons: their lines are full, they need a second source, or they want to test a formulation without investing first.
- 01
Innovation, market entry, EU production base
Test my formulation- Pain
- A new formulation looks promising but unproven, and nobody wants to sign the CAPEX before the market answers.
- Gain
- Lab trial, scale-up and first campaigns on production-scale lines, with EU-made supply from day one.
- ROI
- Market validated before investing, shorter time-to-market, less exposure to import barriers.
- 02
Capacity gap
Plan an overflow campaign- Pain
- Your lines are full. Maintenance, secondary grades or a product changeover eat prime capacity.
- Gain
- We run your secondary grades or overflow campaigns to your spec, so your own lines stay on your core products.
- ROI
- No CAPEX, a variable cost per kilo, and sales you would otherwise turn down.
- 03
Back-up line for unplanned disruption
Get a back-up line on standby- Pain
- An extruder breaks down, a supplier fails, demand spikes. Your customers still expect their pellets.
- Gain
- A second source qualified in advance, producing the same formulation to the same specification.
- ROI
- Downtime and contractual penalties avoided, and a business-continuity plan you can show your auditors and customers.
Deglobalisation and import barriers make an EU production base more valuable every year, and grid electrification is pushing HFFR cable-compound demand beyond many producers' in-house capacity. Our AEO customs status keeps cross-border flows simple.
One toolbox, several niche processes
Our machines and process know-how are combined around each formulation.
Machines
Twin-screw extruders
Reactive extrusion, phase transfer, devolatilisation and high-loading liquid injection.
Compaction units
Compaction lines for non-dusting additive blends.
Know-how
Reactive extrusion
Grafting, peroxide crosslinking and controlled degradation during compounding.
Viscous liquid injection
Metered injection of viscous liquid additives into the compounding process.
Non-dusting blends
Stable, dust-free pellets made of 100% additive blends.
Handling thermo-shear sensitive materials
Pelletizing flexibility
Underwater and air-cut pelletizing, including low-melting-point materials.
Screw design flexibility
Materials we handle
If it melts, disperses or grafts, there is a good chance we have run it before. If we haven't, we'll tell you straight away.
Polymers
- Polyolefins
- Engineering polymers
- Fluorinated polymers
- Epoxy resins
- Acrylics
- Rubbers
- Styrenics
- TPU
- TPE-E
- TPV
- TPS
- TPA
- Bio-based and biodegradable polymers
- Recycled polymers
Additives
- Mineral fillers (hollow glass beads)
- Organic peroxide (liquid and powder)
- Viscous liquid additives
- All fiber types
- Halogen-free flame retardants
- Halogenated flame retardants
- Maleic anhydride
- Sulfur
- Exo / Endothermic blowing agents
Who we work with
Read the chain from left to right. On the left, the raw materials: resins, powders and additives from resin producers, additive suppliers, and bio-based or recycled feedstocks from recyclers. In the centre, Polytechs: the compounding step that turns those inputs into an engineered compound. On the right, the outlets: film converters, cable makers, construction profile extruders, pipe producers and fibre manufacturers.
Left · InputsResin producers, additive suppliers and recyclers bring pellets, powders and liquids.
Centre · PolytechsThe compounding step: blending, reacting and pelletizing on our 18+ lines.
Right · OutletsCable, film, construction profiles, pipes and fibre — our partners' end products.
How a project runs
Every project follows five steps, and the NDA always comes first.
From lab batch to mass production on the same line configuration, with the team that will run your campaigns.
Start with the NDA
- Step 01
Bilateral NDA
We sign a mutual NDA before you share any recipe or technical data.
- Step 02
Feasibility assessment
Our engineers review your formulation and tell you which line configuration fits it.
- Step 03
Lab trial
We run a first batch and test it in our own lab.
- Step 04
Scale-up trial
We confirm the process on production-scale equipment against your specification.
- Step 05
Campaigns
We produce your campaigns with the team that ran the trials.
Your formulation stays yours
- Bilateral NDA signed before any recipe is shared.
- Your formulation and your product IP remain yours. Our process know-how stays ours. Both are written into the toll agreement.
- Raw materials and finished lots traced batch by batch.
- Access to your project data limited to the team running it.
Quality, safety, environment
Our own lab checks every lot, and the site is audited against seven schemes.
| No. | Test | What it tells you |
|---|---|---|
| 01 | MFI | Melt flow, checked against your specification |
| 02 | Brookfield viscosity | Viscosity of liquid additives and low-melt materials |
| 03 | Density | Filler level and formulation consistency |
| 04 | Ash content | Actual mineral filler loading |
| 05 | Melting point | Thermal behaviour of the compound |
| 06 | Contamination level (film and pellet) | Gels, specks and black spots |
| 07 | Colorimetry | Colour conformity lot to lot |
| 08 | Mechanical properties | Tensile and related properties of the compound |
| 09 | VOC content | Volatile residues after processing |
| 10 | IR spectrometry | Chemical identity of raw materials and compounds |
| 11 | DSC | Melting, crystallisation and curing behaviour |
| 12 | TGA | Thermal stability and composition |
| 13 | HPLC | Additive identification and dosing |
| 14 | Humidity index | Moisture before packing |
ISO 9001
Every campaign follows documented, audited procedures, from raw-material intake to shipment.
ISO 14001
Emissions, waste and energy on the site are managed and audited.
ISO 45001
Safe handling of peroxides and powders is audited, not improvised.
ISCC PLUS
Mass-balance circular and bio-based materials with traceable claims. Claims apply only to materials within the certificate scope.
GPI
Pellet-loss prevention audited on site.
AEO status
Simplified, trusted customs procedures for your imports and exports.
EcoVadis Committed badge
Our CSR performance is assessed by an independent platform.
Frequently asked questions
Q.01What is toll compounding?
Toll compounding means we compound your formulation on our lines, to your specification. You keep the recipe and the product IP; we supply the equipment, the process know-how and the team.
Q.02How do trials scale to production?
Lab trials use the same line configuration as the production campaigns that may follow.
Q.03Do you sign an NDA before looking at my formulation?
Yes. A bilateral NDA is the first step of every project, before any recipe or technical data is shared. Please do not send confidential recipes before it is signed.
Q.04Which processes do you run?
BUSS co-kneaders, co-rotating twin-screw extruders, compaction lines for non-dusting blends, pilot lines, liquid injection, underwater and air-cut pelletizing, across 18+ production lines.
Q.05Can you act as a back-up line if my own extruder stops?
Yes. We can qualify your grade in advance so a second source is ready to produce the same formulation to the same specification if your line stops.
Q.06Which polymers can you process?
Polyolefins, engineering polymers, fluorinated polymers, epoxy resins, acrylics, rubbers, styrenics, TPEs (TPU, TPE-E, TPV, TPS, TPA), bio-based, biodegradable and recycled polymers.
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