The company supports OEMs and designers with Calibre polycarbonate resins, Calibre Megarad
polycarbonate resins, Emerge advanced resins and Magnum ABS resins.
The Spacekeeper Direct retractor is made with Calibre[TM] MegaRad
polycarbonate resins and Styron[TM] polystyrene resins offered by Dow Plastics.
The GSI retractor is made with Calibre MegaRad
polycarbonate resins and Styron polystyrene resins offered by Dow Plastics, Midland, MI.
The older unit, used officially until 1986, was 1 Megarad
(Mrad), equal to 10 kGy.
Made with Dow's Calibre MegaRad
polycarbonate resins and Styron polystyrene resins, the Spacekeeper Direct retractor is the main instrument involved in the "skin-bridging" technique identified by GSI.
The materials show good resistance to a wide range of solvents and can be repeatedly sterilized by autoclaving, EtO, and 10 megarad
For those rubbers which predominantly crosslink during irradiation, a 100 megarad
radiation dose about doubles or trebles the original S-100 value (ref.
Dow's Calibre MegaRad
2081 clear polycarbonate resin for the hub component provides the rigidity and precision tolerances for securing the needle while preventing leakage of air or medication at the needle/hub interface.
One change worth mentioning here is the switch from using megarads
(Mrd) to kilo-Grays (kGy) when measuring irradiation dosages
from a 200,000-rad/hour cobalt source was sufficient to kill most resistant spores when mixed with goat hair; 2 megarads
was recommended to include a margin of safety (31).
The kiloGray is the same as an older measure, megaRads
A maximum dosage of 11 megarads
is prescribed for the sterilization of mail and, although a dosage of only 300 rads is fatal to humans, elements in gem minerals are not made radioactive by the process.