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crim 1 > Glass Examination > Flashcards

Glass Examination Flashcards

1
Q

glass characteristics

A

hard brittle, transparent

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2
Q

what is doping in glass

A

adding other chemicals into the glass

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3
Q

whta is glas made of

A

silicon oxide

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4
Q

how is glass made

A

melting sand and allowing it to cool and crystalize

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5
Q

what are some common dopants

A

sodium carbonate, calcium oxide, boron oxides

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6
Q

how is tempered glass made

A

heated and rapidly cools to break into not sharp pieces

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7
Q

what is laminated glass

A

where PVB is sandwiched between 2 pieces of glass

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8
Q

what is a fracture match

A

the only way to individualize a fracture where a piece is perfectly fitted into a crack

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9
Q

what are some tests for class evidence

A

density, IR, color, thickness, flatness, surface features

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10
Q

how do you collect glass peices

A

collection using forceps

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11
Q

how do you collect hair/fibers

A

by foreceps

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12
Q

what are some surface features of glass

A

patterned glass (frosted), coated glass (reflective/UV protection), float glass (really flat glass)

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12
Q

how is RI measured

A

glass in oil, increase temp and when disappeared then that is RI (Becke line)

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13
Q

how float glass made

A

melted glass over molten tin (gives one side fluorescence)

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14
Q

how do you test density

A

float/sink methiod

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15
Q

What is GRIM

A

a measurement of glass IR on hot plate with microscope

16
Q

where is the crater shape found

A

in side of non-impact

16
Q

how does the glass break

A

opposite side bends then breaks to produce radial cracks
then impact side breaks making concentric cracks

17
Q

what side are walners cracks on for radial cracks

A

on the opposite side of impact

17
Q

what are t-junction

A

where one crack will stop another
the one that appears first will be the top of the T

18
Q

what is different about thermal cracks

A

they have no walner cracks, so can’t tell directionality

19
Q

what are some things you have to find about glass

A

of strikes, glass fragment size, distance between glass and shooter

crim 1 (11 decks)

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