ChronoFlex AL is a family of biodurable aliphatic polycarbonate-based thermoplastic urethanes designed to overcome surface degradation such as stress-induced microfissures.
With a long history of reliable performance in both long and short term devices, this medical grade polymer has the versatility to be used across a broad range of applicational areas ranging from oncology and neurology to cardiovascular disease management.
These ether-free polyurethane elastomers are biostable and display a low modulus of elasticity, excellent solvent resistance and limited softening in-vivo.
These products are adaptable to most standard manufacturing processes and are available in hardnesses ranging from 75 Shore A to 75 Shore D.
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ChronoFlex AL (typical example ranges shown)* | ASTM Standard | |
Durometer Range Available | 75 Shore A – 75 Shore D | |
Specific Gravity | 1.10 – 1.40 | D792 |
Melt Flow | 2 – 26 g/10 min | 205° C/3.26 kg | D1238 |
MECHANICAL PROPERTY RANGES
Durometer | 75A-B20* | 55D | 75D | ASTM |
Ultimate Tensile Strength (psi) | 4000-9000 | 5000-10000 | 3000-8000 | D638 |
Tensile (psi) |
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@ 50% elongation | 350-650 | 1500-1800 | 3000-8000 | D638 |
@ 100% elongation | 550-850 | 1800-2200 | 3000-8000 | D638 |
@200% elongation | 800-1200 | 2800-4200 | - | D638 |
@300% elongation | 1200-2000 | 4200-10000 | - | D630 |
Ultimate Elongation (%) | 350-750 | 200-400 | 100-300 | D638 |
*Data provided herein is meant to show a general range for the ChronoFlex AL product lines; these properties can be tailored to meet specific values based on customer requirements.
CHRONOFLEX AL
| USP CLASS VI TESTED: | ISO TESTED: |
MEM Elution | Meets ISO 10993-5 guidelines | |
AGAR Overlay | Meets ISO 10993-5 guidelines | |
Systemic Injection Test | Meets Class VI guidelines | Meets ISO 10993-11 guidelines |
Intracutaneous Injection Test | Meets Class VI guidelines | Meets ISO 10993-10 guidelines |
Intramuscular Implantation (macro) | Meets Class VI guidelines | |
Pyrogenicity | Meets ISO 10993-11 guidelines | |
Hemolysis | Non – Hemolytic | |
Phthalate Free | Does not contain or come in contact with DEHP | |
Animal-Free Origin Certified | BSE/TSE free |
ChronoFlex AL processing can be optimized by drying to a moisture content equal to or less than 0.05% by weight prior to melt processing.
Typically, the pellets must be dried for 3-4 hours with a dryer inlet air temperature of 180ºF +/- 20ºF. We recommend a machine-mounted desiccant-type hopper dryer, capable of reaching and maintaining a dew point of -40ºF. If dry times are in excess of 8-10 hours, a hopper dryer temperature of 120-150ºF is usually sufficient to achieve optimal moisture content.
Typical Material Processing Temperatures in Fahrenheit with a tolerance of +/- 20ºF*
CHRONOFLEX AL | 75 Shore A–45 Shore D | 55 Shore D–75 Shore D |
ZONE 1 | 380 | 400 |
ZONE 2 | 390 | 400 |
ZONE 3 | 410 | 410 |
CLAMP/ ADAPTER | 420 | 410 |
DIE | 420 | 440 |
MELT TEMPERATURE | 420 | 420 |
WATER COOL TEMPERATURE | 60 | 60 |
SCREEN PACK (all Dutch weave) | 600 MESH | 600 MESH |
* These profiles are meant to offer a general guideline for processing the materials via extrusion or injection molding. The table reflects a suggested range of temperature profiles and set up conditions which should be adjusted to accommodate your individual machine configurations and processing parameters.
Click on the image below to view the ChronoFlex AL datasheet.
Click on the image below to view the MSDS sheet.
