ChronoSil is a family of polycarbonate based silicone elastomers. These biocompatible materials maintain the inherent benefits of polycarbonate-based urethanes, including high pressure resistance, tensile-strength and superior chemical resistance combined with silicone’s industry recognized advantages such as heightened elongation, superior elasticity and a low coefficient of friction.
Consistent with other polycarbonate-based materials, ChronoSil can be synthesized to provide targeted mechanical properties and is resistant to Environmental Stress Cracking (ESC).
These products are adaptable to most standard manufacturing processes and are available in hardnesses ranging from 75 Shore A to 75 Shore D.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
CHRONOSIL (typical example ranges shown)* | ASTM Standard | |
Durometer Range Available | 75 Shore A – 75 Shore D | |
Silicone Content Available | 5% - 20% | |
Water Absorption | 0.59 - 0.62% | D570 |
Melt Flow | 2 – 26 g/10 min | 205° C/3.26 kg | D1238 |
MECHANICAL PROPERTIES*
Durometer | 80A | 55d | |
% Silicone | 5% | 5% | |
Ultimate Tensile Strength (psi) | 3300 - 7000 | 5000-10,000 | D638 |
Tensile (psi) | |||
@ 50% elongation | 350 - 600 | 2000 - 2500 | D638 |
@ 100% elongation | 500 - 800 | 2500 - 3000 | D638 |
@ 200% elongation | 900 - 1250 | 3500 - 4500 | |
@ 300% elongation | 1500 - 2100 | 4600 - 5500 | D638 |
Ultimate Elongation (%) | 450 - 650 | 350 - 550 | D638 |
*Data provided herein is meant to show a general range for the ChronoSil product lines; these properties can be tailored to meet specific values based on customer requirements.
CHRONOSIL
| 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 | |
Intracutaneous Injection Test | Meets Class VI guidelines | |
Intramuscular Implantation (macro) | Meets Class VI guidelines | |
Phthalate Free | Does not contain or come in contact with DEHP | |
Animal-Free Origin Certified | BSE/TSE free |
ChronoSil 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*
CHRONOSIL | 75 Shore A – 45 Shore D | 55 Shore D – 75 Shore D |
ZONE 1 | 320 | 370 |
ZONE 2 | 320 | 380 |
ZONE 3 | 360 | 420 |
CLAMP/ ADAPTER | 380 | 400 |
DIE | 400 | 410 |
MELT TEMPERATURE | 390 | 400 |
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 ChronoSil datasheet.
Click on the image below to view the MSDS sheet.
