Laripur 4525EG
An extrusion-only polyester grade at Shore 46 D. Hoses, profiles, transmission belts and films.
An extrusion-only polyester grade at Shore 46 D. Hoses, profiles, transmission belts and films.
Laripur 4525EG is a polyester based TPU at Shore 46 D, supplied only as an extrusion grade. COIM lists it for the extrusion of hoses, profiles, transmission belts and films.
There is no injection version of this grade on COIM's sheet, which is why the EG code is part of the name rather than an option on the order.
Tensile strength is 8800 psi at 510 percent elongation, with tear strength of 126 N/mm and a flexural modulus of 14300 N per square mm. The VICAT softening point is 120 degrees F, the lowest figure in this catalog, so check service temperature before specifying it.
| Property | Typical value |
|---|---|
| Specific gravity | 1.22 g/cm3 (ASTM D792) |
| Shore hardness | 46 D (ASTM D2240) |
| Abrasion loss | 35 mm3 (DIN 53516) |
| Tensile modulus 50 percent | 1400 psi (ASTM D412) |
| Tensile modulus 100 percent | 1600 psi (ASTM D412) |
| Tensile modulus 300 percent | 3700 psi (ASTM D412) |
| Tensile strength | 8800 psi (ASTM D412) |
| Elongation at break | 510 percent (ASTM D412) |
| Tear strength | 126 N/mm (ASTM D624) |
| VICAT softening point | 120 degrees F (ASTM D1525) |
| Flexural modulus | 14300 N/mm2 (ASTM D790) |
| 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.
Extruded profile.
Named on the data sheet.
Extruded film.
Dry before processing at 175 to 195 degrees F for 3 hours, preferably in a dehumidifying drier fed by air with a dew point below minus 22 degrees F. Skipping the drying step is the most common cause of splay and bubbles in a TPU part.
COIM's suggested extrusion profile runs zone 1 at 390 degrees F, zone 2 at 400 and zone 3 at 410, with the adapter at 390 and the die at 385. The published sheet carries an obvious typing error in the zone 4 figure, so we have left it out rather than reprint it; ask us and we will confirm the current value with COIM. Machine, screw and downstream equipment all move these anyway, 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.
Not on COIM's published sheet. 4525EG is an extrusion grade and the EG code is part of the grade name. If you need a similar hardness for injection, Laripur 5225 at Shore 51 D is the closest polyester grade with a moulding profile.
Polyester. COIM describes it as a quality polyester based TPU.
COIM publishes a VICAT softening point of 120 degrees F, the lowest in this catalog. That is a softening figure under a standard load rather than a continuous service rating, but it is low enough that it should be checked against your duty before the grade is specified.
Yes. Three hours at 175 to 195 degrees F in a dehumidifying drier with the air dew point below minus 22 degrees F. In extrusion, undried TPU shows up as bubbles in the wall and a surface that will not gloss.
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.
The nearest polyester grade with an injection version, Shore 51 D.
Softer polyester at Shore 70 A.
Polyether at Shore 50 D, for hose and cable in wet service.
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.