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The other examples don't have any obvious impact evidence and may have a volcanic origin, says H.
Blendex 338 ABS modifier reportedly has superior impact efficiency even at low temperatures.
Subsequent work has backed that suggestion, convincing many on both sides of the impact issue that the so-called Chicxulub crater does indeed mark ground zero for a colossal crash 65 million years ago (SN: 8/15/92, p.
Paraloid and Paraloid EXL all-acrylic and MRS impact modifiers for vinyl and other engineering resins.
If major extinctions dragged out over a long stretch of time or began before the impact, then factors unrelated to a bolide may have driven some of the die-offs.
Better low-temperature impact, higher HDT, and increased stiffness are also claimed.
But Penfield dropped that bombshell on the wrong audience -- a conference of oil geologists, who cared about as much for impact craters as they did for dermatology.
What's more, many material suppliers, compounders, and additive masterbatch suppliers are turning to instrumented impact tests that use devices outfitted with load sensors, which provide more detailed information about materials' response to impact loads.