Laripur 2203-93A
PTMG polyether TPU at Shore 92 A, built for high performance seals of wide applicability and pneumatic sealing in particular. Compression set is published.
PTMG polyether TPU at Shore 92 A, built for high performance seals of wide applicability and pneumatic sealing in particular. Compression set is published.
Laripur 2203-93A is a polyether PTMG based TPU at Shore 92 A. COIM built it for the production of high performance seals of wide applicability, and names the pneumatic field in particular.
It is one of only two grades in this catalog where COIM publishes compression set, which is the property a seal is actually judged on. The figures are 16 percent at 70 hours and 23 degrees C, and 28 percent at 22 hours and 70 degrees C, both by ASTM D395.
Tensile strength is 8000 psi at 500 percent elongation, with tear strength of 91 N/mm and a low abrasion loss of 30 cubic mm by DIN 53516. The VICAT softening point is 293 degrees F and the flexural modulus is 6400 N per square mm, low for the hardness, which is what lets a seal conform.
| Property | Typical value |
|---|---|
| Specific gravity | 1.14 g/cm3 (ASTM D792) |
| Shore hardness | 92 A (ASTM D2240) |
| Abrasion loss | 30 mm3 (DIN 53516) |
| Tensile modulus 50 percent | 1200 psi (ASTM D412) |
| Tensile modulus 100 percent | 1500 psi (ASTM D412) |
| Tensile modulus 300 percent | 3100 psi (ASTM D412) |
| Tensile strength | 8000 psi (ASTM D412) |
| Elongation at break | 500 percent (ASTM D412) |
| Tear strength | 91 N/mm (ASTM D624) |
| VICAT softening point | 293 degrees F (ASTM D1525) |
| Flexural modulus | 6400 N/mm2 (ASTM D790) |
| Compression set, 70h at 23 degrees C | 16 percent (ASTM D395) |
| Compression set, 22h at 70 degrees C | 28 percent (ASTM D395) |
| 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 names the pneumatic field specifically.
COIM's stated purpose for the grade, of wide applicability.
Low abrasion loss of 30 cubic mm by DIN 53516.
PTMG polyether chemistry.
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 375 degrees F, zone 2 at 385, zone 3 at 390 and the nozzle at 395. 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.
16 percent at 70 hours and 23 degrees C, and 28 percent at 22 hours and 70 degrees C, both by ASTM D395. Compression set is what tells you whether a seal will still seal after it has been squeezed for a year, and most TPU sheets do not publish it.
COIM names the pneumatic field in particular, and describes the grade as being for high performance seals of wide applicability. For heavy duty hydraulic sealing, Laripur E 107-93A is the grade COIM built for that duty, at a similar hardness and with a much higher softening point.
Polyether PTMG. In sealing that matters when the fluid is water or glycol, where a polyester TPU hydrolyses. In mineral oil the polyester grades hold up better, so the fluid decides the chemistry.
Near the top of the Shore A scale, roughly a hard skate wheel. The flexural modulus is 6400 N per square mm, which is low for that hardness, so the material still conforms to a groove rather than sitting in it like a plastic ring.
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.
Polycaprolactone ester at Shore 93 A, for heavy duty hydraulic seals.
Polyether at Shore 90 A for injection and extrusion.
Softer polyether at Shore 77 A.
Sealing duty, compression set and what a seal grade has to survive.
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.
How a seal grade is judged, and what compression set is telling you.