Seals softens more rapidly as temperatures increase, leading to extrusion and nibbling failure patterns The generally higher compression set of Thermoplastic can lead to compression failures . The injection molding process can create voids inside the seal as it's molded. This can cause sudden failure of the seals and lead to costly down-time. Injection molding is not economical on short production runs. High tooling costs make the research and development of specialty seals cost-prohibitive.
The only process capable of combining both top quality and large volume in polyurethane seals. Assures a homogeneous material with no voids or trapped air insuring a stable seal. Low-cost tooling enables one-off seal production for researching and development specialty seals. Our tooling and molding process also accommodates quick mold changes for short production runs; this means savings and a seal suited precisely to your needs. Die to its inherit superior qualities, you can rely on our seals over time in all your critical applications.
Solid pellets: Injection molders typically add up to 10% recycled materials. This practice can degrade the physical properties of the finished seals; but even when 100% virgin polymers are used, the Thermoplastic's physical properties are not stable as Universal Seal's Thermoset.
Liquid resin and curing agent: Centrifugally cast Thermoset seals use only 100% virgin ram materials. Thermoset cast are free of internal voids (i.e. air bubbles) which can cause sudden failure and costly down-time.
Thermoplastic |
VS | Polyurethane |
|---|---|---|
|
Hardness, Shore A |
||
|
90 |
92 | |
|
Tensile
Modulus
|
||
|
1100 |
1400 | |
|
Tensile
Modulus
|
||
|
2000 |
2600 | |
|
Tensile Strength , PSI |
||
|
5000 |
5800 | |
|
Ultimate Elongation , % |
||
|
450% |
420% | |
|
Compression Set , Method 'B'% |
||
|
35% |
24% | |
|
Bashore Rebound , % |
||
|
40% |
45% | |
|
Universal Seal's Thermoset Unithane 292 A - outshines even premium Thermoplastic polyurethane in all of the above strength categories. The best molding method capable of taking advantage of these benefits is the Universal Seal centrifugal molding method. |
||
Premium Thermoplastic |
Thermoset Polyurethane |
|
|---|---|---|
|
Hardness Shore A |
90 |
92 |
|
Tensile Modulus , PSI @ 100% Elongation |
1100 |
1400 |
|
Tensile Modulus , PSI @ 300% Elongation |
>2000
|
2600 |
|
Tensile Strength , PSI |
5000 |
5800 |
|
Ultimate Elongation , % |
450% |
420% |
|
Compression Set , Method 'B'% |
35% |
24% |
|
Bashore Rebound , % |
40% |
45% |
|
Universal Seal's Thermoset Unithane 292 A - outshines even premium Thermoplastic polyurethane in all of the above strength categories. The best molding method capable of taking advantage of these benefits is the Universal Seal centrifugal molding method. |
||