10 Upton Drive, Wilmington, MA 01887
Toll Free 800-657-7704
Architectural Laboratory Water Treatment Marine Air Handling

lexan machining

Before machining of the molds can be started, we must select the plastics to be used for each part. There are a great many plastics to choose from that can be used for injection molding. We first discuss some considerations and general properties of the resins we are considering using, and follow that with a comparison of properties and characteristcis of the several plastics we've zeroed in on as top choices for the radome itself.
There are two main options for the base plate and ring parts:
" use the same plastic as we use for the dome, and
" use one of the other resins listed below, or else a higher flow 'nylon' resin such as a type 66, with 14% glass reinforcement. (see footnote #1)
General Considerations:
Previous plastics used in various radome-type GPS antenna covers include lexan, acrylic, foams, ABS, Xenoy, and a variety of other polycarbonates and alloys. Fiberglass covers, and other inventive materials such as coated fabrics have been used in operational or prototyping, as well as plastics. We recognize from these experiences that opacity or low transmissivity of the GPS signal can occur from things like metallic additives, used in fiberglass and plastics either as a fire retardents or colorant. We also recognize that some of the materials used in the past are insuffienctly resistant to strong impacts, and feel that for the new injection-molded dome, the plastic selected must be as strong or nearly as strong as the lexan thermo-formed dome prototypes we had made in late 1997. Key parameters for evaluating this are 'notched impact' and 'tensile elongation' values that we list below for Lexan, Xenoy, and Geloy. The material must also resist degradation from weather and ultra-violet (UV) radiation over a long time interval (5-10 years) as well as possible. Whereas polycarbonates have long molecular structures that tend to break down into shorter molecules with time, UV stabilizing additives are available to slow this degradation. Other plastics, such as polycarbonate-PBT alloys or ASA-PVC alloys considered here, are inherently less susceptible to UV degradation. Longer polymers are stronger but less resistant to UV degradation, so there is a trade-off between weather resistance and strength (see simple table below).

Lexan MachiningPlease Contact Us to discuss your lexan machining needs. You design it, we build it.

lexan machining

techniques | fittings
home | contact | sitemap | privacy | about | glossary cnc router, graduated cylinder, polypropylene, fume hood, plastic fabrication, rectangular tank, fretwork, pvc duct, plastic water tank, laminar flow hood, plastic machining, marine fish tank, plastic water storage tank, cylinder graduated reading, marine holding tank, acrylic fabrication, marine tank, graduated cylinder definition, polypropylene tank, plastic cone, cnc plastic router, petg plastic
cnc router | plastic fabrication | acrylic | manufacturing | water & air treatment | resources| web design