Capabilities
Injection moulding, extrusion and in-house compounding
50 people, 16 injection machines, 3 extrusion lines and 3 compression presses in Curitiba, Brazil. All parts are produced to customer drawing. The tables below are our working envelope. If your part sits outside it, tell us — we will say plainly whether we can make it.
Processes
Injection moulding is our main process. Extrusion and compression run alongside it for parts where they are the better route. The table below is a selection guide, not a product list — see How a part is developed below.
| Process | Machines | Range | Suited to |
|---|---|---|---|
| Injection moulding | 16 | 80–240 t clamping | Repeat series, tight dimensional repeatability, complex geometry, minimal flash |
| Extrusion | 3 | Hot air tunnel vulcanisation | Continuous sections cut to length — tube, cord, profile |
| Compression moulding | 3 | — | Thick sections, larger parts, short runs and prototypes |
Compounding
Compounds are mixed in-house. Elastobras develops and adjusts its own formulations rather than buying ready-mixed compound.
| Mixing equipment | 1 internal mixer (Banbury type) and 2 open mills |
|---|---|
| Batch size | up to 30 kg |
| Batch release testing | Rheometer curve and hardness, on every batch |
Formulation development is carried out in-house, and the compounding activity is inside the scope of our ISO 9001:2015 certificate.
Materials
Compounds are produced across a hardness range of 25 to 90 Shore A. Because we formulate in-house, the elastomer is chosen against the service condition of the part — the substances it will meet, the temperature it will see, the colour and the mechanical requirement. The same part can be produced in different families for different customers.
| Family | Designation | Chosen when the part meets |
|---|---|---|
| Nitrile | NBR | Oils, fuels and hydrocarbons |
| Ethylene propylene | EPDM | Weather, ozone, UV, hot water and steam — outdoor housings |
| Silicone | VMQ | Wide temperature range, low compression set, chemically inert |
| Styrene butadiene | SBR | Abrasion and general dynamic service |
| Natural rubber | NR | High resilience, tear strength, dynamic loading |
| Chloroprene | CR | Moderate oil resistance combined with weather resistance |
How a part is developed
Elastobras holds no catalogue and no shelf stock. Every part is customer-specific on two axes at once: a dedicated tool, and a compound formulated for that application.
- Drawing, sample or problem. A part can start from a technical drawing, from a physical sample to be reproduced, or from a component that is failing in service.
- Compound selection. We propose an elastomer family and formulation against the service condition — media, temperature, hardness, colour, mechanical requirement.
- Tooling. Moulds are designed and produced with partner toolmakers to the approved geometry.
- First article. Sample parts with dimensional report and material data for customer approval.
- Series production. Under a frozen formulation, with the rheometer curve of every batch on record.
The parts shown across this site are examples of work done, not products offered. What we supply is the development and the series that follows it.
Finishing
Deflashing, dimensional inspection and packaging to customer specification. Extruded parts are cut to length on automated equipment with 100% inline inspection.
Series
Series run from 30 pieces to continuous high-volume production. The low end is a development run on the compression presses. The high end is series production on the extrusion lines, shipped monthly for export.
Minimum order quantity depends on the tooling and the compound, not on a fixed policy. A short development run and a multi-million series are both normal here.