Laripur 8125
Polyester TPU at Shore 83 A that COIM builds for hydrolysis resistance. Sport soles, wheels, screen elements and technical items, with 8125 EG for extrusion.
Polyester TPU at Shore 83 A that COIM builds for hydrolysis resistance. Sport soles, wheels, screen elements and technical items, with 8125 EG for extrusion.
Laripur 8125 is a polyester based TPU at Shore 83 A that COIM describes as combining excellent hydrolysis resistance with very good mechanical properties.
COIM designed the standard version for injection molding of sport soles, wheels, screen elements and technical items, and the 8125 EG version for hoses, profiles, transmission belts and films.
Tensile strength is 60.5 N per square mm at 626 percent elongation, with tear strength of 81 N/mm and abrasion loss of 40 cubic mm. The properties on this sheet are measured to ISO methods rather than the ASTM methods used on most of the range, so compare against another grade with that in mind.
COIM describes 8125 as Laripur 8025 with an additive for increased hydrolysis resistance, and separately confirms that 8025 and 8225 are the same polymer differing only in melt flow index. So the three are one polymer in three forms: 8025 and 8225 for dry service at two flows, and 8125 when the same part has to stay wet.
COIM marks this sheet provisional. We will send the current revision with any sample.
It is also written as thermoplastic polyurethane, TPU, polyester TPU, polyester based TPU, and polyester polyurethane.
| Property | Typical value |
|---|---|
| Density | 1.20 g/cm3 (ISO 2781) |
| Shore hardness | 83 A (ISO 7619-1) |
| Abrasion loss | 40 mm3 (ISO 4649) |
| Tensile modulus 50 percent | 3.8 N/mm2 (ISO 22654) |
| Tensile modulus 100 percent | 4.9 N/mm2 (ISO 22654) |
| Tensile modulus 300 percent | 13.0 N/mm2 (ISO 22654) |
| Tensile strength | 60.5 N/mm2 (ISO 22654) |
| Elongation at break | 626 percent (ISO 22654) |
| Tear strength | 81 N/mm (ISO 34-1) |
| Form | Regular pellet |
Typical values from the manufacturer's technical data sheet. They describe the product, they are not a specification. We will send the current TDS and the batch documentation your qualification needs.
Tell us the binder system, the property you are targeting, and the volume you expect. We will confirm the grade, send the documentation, and ship a sample from North American stock.
COIM's first listed use for the standard version.
Named on the data sheet.
Screening media and related parts.
Extrusion in the 8125 EG version.
Extrusion in the 8125 EG version.
COIM builds the grade for hydrolysis resistance.
Dry before processing at 80 to 90 degrees C for 3 hours, preferably in a dehumidifying drier fed by air with a dew point below minus 30 degrees C. Skipping the drying step is the most common cause of splay and bubbles in a TPU part.
COIM's suggested molding profile runs zone 1 at 180 degrees C, zone 2 at 185, zone 3 at 190 and the nozzle at 185. The suggested extrusion profile runs zone 1 at 180, zone 2 at 185, zone 3 at 190, zone 4 at 185, adapter 180 and die 175. Machine, screw and downstream equipment all move these, so treat them as a starting point.
Package sizes: 25 kg bags, or 500 kg and 1000 kg octabins.
Storage: Six months from the date of delivery, in the original sealed packaging, in a dry well ventilated place out of direct sun.
COIM does not consider the product dangerous. Read the safety data sheet before handling.
Polyester. COIM's data sheet describes it as a polyester-based TPU, and adds that it combines excellent hydrolysis resistance with very good mechanical properties.
Better than a standard polyester grade. Hydrolysis resistance is the stated reason this grade exists. It is still a polyester TPU, so for continuous immersion or steam a polyether grade such as Laripur 9060 remains the safer chemistry. Tell us the temperature, the fluid and the duration and we will say which one to trial.
COIM measured this sheet to ISO methods. Most of the USA sheets use ASTM. A second sheet in US units exists but its tensile strength row is inconsistent with its own modulus rows, so we publish the ISO figures rather than reprint an error.
It is the same polymer with an additive for increased hydrolysis resistance. COIM describes 8125 that way relative to 8025, and confirms 8025 and 8225 are the same polymer at two different melt flow indices. All three sit within a point of each other on hardness, Shore 83 to 84 A, and carry the same applications. Choose 8025 or 8225 on flow for dry service, and 8125 when the part gets wet and stays wet. Both statements came from COIM through our sales team, not off the data sheet, so ask and we will get them in writing for a qualification file.
Yes. We send the Technical Data Sheet (TDS) and Safety Data Sheet (SDS) on request, in the manufacturer's current revision. Use Request TDS or SDS above and tell us what your qualification review needs.
Standard polyester at the same Shore 83 A.
Polyether at Shore 88 A, for the wettest service.
Polyester at Shore 84 A.
Hose, profile, belt and film, and what an extrusion grade has to do differently.
Which chemistry survives hot water, and which survives oil and abrasion.
How to specify a grade when you have a part and not a grade number.
Drying, splay, sink and the faults that come back to moisture.