Laripur 72D25
The hardest polyester grade in the range at Shore 67 D, with 10300 psi tensile and 228 N/mm tear. Technical items, footwear components and wheel parts.
The hardest polyester grade in the range at Shore 67 D, with 10300 psi tensile and 228 N/mm tear. Technical items, footwear components and wheel parts.
Laripur 72D25 is a polyester based TPU at Shore 67 D, the hardest polyester grade in this catalog. COIM lists it for the injection moulding of technical items, footwear components and wheel parts.
Tensile strength is 10300 psi and tear strength 228 N/mm, with a flexural modulus of 82000 N per square mm. Elongation at break is 320 percent, the lowest of the polyester grades here.
The VICAT softening point is 365 degrees F, the highest polyester figure in this catalog. Between that and the modulus, this is the grade for a load-bearing part that has to keep its shape.
| Property | Typical value |
|---|---|
| Specific gravity | 1.25 g/cm3 (ASTM D792) |
| Shore hardness | 67 D (ASTM D2240) |
| Abrasion loss | 40 mm3 (DIN 53516) |
| Tensile modulus 50 percent | 3600 psi (ASTM D412) |
| Tensile modulus 100 percent | 4000 psi (ASTM D412) |
| Tensile modulus 300 percent | 9300 psi (ASTM D412) |
| Tensile strength | 10300 psi (ASTM D412) |
| Elongation at break | 320 percent (ASTM D412) |
| Tear strength | 228 N/mm (ASTM D624) |
| VICAT softening point | 365 degrees F (ASTM D1525) |
| Flexural modulus | 82000 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.
Named on the data sheet.
COIM's first listed use.
Named on the data sheet.
Where a flexural modulus of 82000 N per square mm is the property being specified.
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 moulding profile runs zone 1 at 395 degrees F, zone 2 at 405, zone 3 at 420 and the nozzle at 410. 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.
It is the hardest polyester grade in this catalog at Shore 67 D. Laripur 7711 is harder still at Shore 77 D, and Laripur 71D60 is a polyether at Shore 70 D. Above about Shore 60 D the material behaves as a rigid engineering plastic rather than an elastomer.
COIM names wheel parts on the sheet. Tear strength is 228 N/mm and abrasion loss is 40 cubic mm by DIN 53516. For a wheel that runs wet or gets washed down, the polyether at a similar hardness, Laripur 6560, is the safer chemistry.
COIM publishes a VICAT softening point of 365 degrees F. That is a softening figure under a standard load, not a continuous service rating. Tell us the temperature, the load and the duration and we will confirm the grade.
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.
Softer polyester at Shore 62 D.
High modulus engineering grade at Shore 77 D.
Polyether at Shore 65 D, for hydrolysis resistance.
Soles, ski boots and footwear components, and how the grades are chosen.
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.
What Shore A and Shore D actually measure, and where the scales overlap.