GC USP Methods

Method 

Phase composition recommendations

Equivalent phase

G1

Dimethylpolysiloxane oil

BP1

G2

Dimethylpolysiloxane gum

BP1

G3

50% Phenyl - 50% Methylpolysiloxane

BPX50

G5

3-Cyanopropylpolysiloxane

BPX70

G6

Trifluoropropylmethylpolysiloxane

-

G7

50% 3-Cyanopropyl - 50% Phenylmethylsilicone

-

G14

Polyethylene glycol (average molecular weight of 950-1,050)

BP20 (WAX)

G15

Polyethylene glycol (average molecular weight of 3,000-3,700)

BP20 (WAX)

G16

Polyethylene glycol (average molecular weight of 15,000)

BP20 (WAX)

G17

75% Phenyl - 25% Methylpolysiloxane

BPX50

G19

25% Phenyl - 25% Cyanopropylmethylsilicone

G20

Polyethylene glycol (average molecular weight of 380-420)

BP20 (WAX)

G25

Polyethylene glycol TPA (Carbowax 20M terephthalic acid)

BP21 (FFAP)

G27

5% Phenyl - 95% Methylpolysiloxane

BPX5

G28

25% Phenyl - 75% Methylpolysiloxane

BPX35

G32

20% Phenylmethyl - 80% Dimethylpolysiloxane

BPX35

G35

Polyethylene glycol & diepoxide esterified with nitroterephthalic acid

BP21 (FFAP)

G36

1% Vinyl - 5% Phenylmethylpolysiloxane

BPX5

G38

Phase G1 plus a tailing inhibitor

BP1

G39

Polyethylene glycol (average molecular weight of 1,500)

BP20 (WAX)

G41

Phenylmethyldimethylsilicone (10% phenyl substituted)

BPX5

G42

35% Phenyl - 65% Dimethylvinylsiloxane

BPX35

G43

6% Cyanopropylphenyl - 94% Dimethylpolysiloxane

BP624 

BPX-Volatiles