Laripur 7711
A high modulus engineering thermoplastic polyurethane at Shore 77 D, the hardest grade in the range. Injection and extrusion of technical items.
A high modulus engineering thermoplastic polyurethane at Shore 77 D, the hardest grade in the range. Injection and extrusion of technical items.
Laripur 7711 is a high modulus engineering thermoplastic polyurethane at Shore 77 D, the hardest grade in this catalog. COIM lists it for injection and extrusion of technical items.
COIM's data sheet does not state a soft segment chemistry for this grade, and we will not assign one it does not claim. If your qualification file needs the chemistry stated, ask and we will get it from COIM in writing.
The flexural modulus is 320000 psi and tear strength is 230 N/mm, with a 50 percent tensile modulus of 9000 psi. Elongation at break is 130 percent, so this material is used as a rigid structural plastic rather than as an elastomer. Abrasion loss is 150 cubic mm by DIN 53516, well above the elastomeric grades, which is the trade for the stiffness.
COIM publishes a notched impact figure of 5.3 kJ per square m at minus 4 degrees F and a VICAT softening point of 195 degrees F.
| Property | Typical value |
|---|---|
| Specific gravity | 1.20 g/cm3 (ASTM D792) |
| Shore hardness | 77 D (ASTM D2240) |
| Abrasion loss | 150 mm3 (DIN 53516) |
| Tensile modulus 50 percent | 9000 psi (ASTM D412) |
| Tensile modulus 100 percent | 9150 psi (ASTM D412) |
| Tensile strength | 10000 psi (ASTM D412) |
| Elongation at break | 130 percent (ASTM D412) |
| Tear strength | 230 N/mm (ASTM D624) |
| VICAT softening point | 195 degrees F (ASTM D1525) |
| Flexural modulus | 320000 psi (ASTM D790) |
| Impact test at minus 4 degrees F | 5.3 kJ/m2 (ASTM D256) |
| 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 stated use, by injection or extrusion.
Flexural modulus of 320000 psi.
Tear strength of 230 N/mm.
Notched impact of 5.3 kJ per square m at minus 4 degrees F.
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 430 degrees F, zone 2 at 440, zone 3 at 445 and the nozzle at 400. Machine, screw and downstream equipment all move these, so treat them as a starting point. The nozzle runs well below the barrel on this grade, which is unusual and is what COIM's sheet specifies.
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.
COIM's data sheet does not say. It describes the grade as a high modulus engineering thermoplastic polyurethane and stops there, so we do not assign it a chemistry. If your qualification file needs one, ask us and we will get the answer from COIM in writing rather than infer it.
Yes, but it behaves as a rigid engineering plastic. Elongation at break is 130 percent against 600 percent or more for the Shore A grades, and the flexural modulus is 320000 psi. It is specified where a part needs stiffness and tear resistance rather than rebound.
150 cubic mm by DIN 53516, against 30 to 50 for the elastomeric grades. Hard TPU does not have the rubbery recovery that gives a soft TPU its abrasion performance. If wear is the duty, a Shore A grade will outlast this one.
Laripur 71D60 at Shore 70 D, a PTMG polyether with a much lower abrasion loss of 50 cubic mm and a published cold impact figure, or Laripur 72D25 at Shore 67 D in polyester.
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.
Polyether at Shore 70 D.
Polyester at Shore 67 D.
Polyester at Shore 62 D.
The whole TPU range PAT supplies, and where each chemistry belongs.
What Shore A and Shore D actually measure, and where the scales overlap.
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.