10.6GAS PERMEABILITY

TABLE 10.5	Gas Permeability Constants (10				10 P ) at 25C for Polymers and Rubbers
The gas permeability constant		P	is deﬁned as
		P			amount of permeant
		P	(area)	(time) (driving forced across the film)
			(area)	(time) (driving forced across the film)
The gas permeability	constant is the	amount	of gas	expressed	in cubic centimeters passed i

1-cm 2 area of ﬁlm when the pressure across a ﬁlm thickness of 1 cm is 1 cmHg and the temperature is 25

All tabulated values are multiplied by 10	10 and are in units of seconds	1 (centimeters of Hg)
are indicated by exponents and are expressed in degrees Celsius.

n 1 s through a

1. Other temperatures

									Gas

Polymer or rubber			He			N 2	H 2	O 2	CO 2	H 2O			Other
Cellulose (cellophane)		0.005			20	0.003 2	0.006 5	0.002 1	0.004 7	1 900		45
Cellulose (cellophane)		0.005				0.003 2	0.006 5	0.002 1	0.004 7	1 900		0.(H006S);2 0.001 7 (SO2 )
Cellulose acetate		13.6		20		30	20	30	30	5 500		30	0
Cellulose acetate		13.6				0.28	3.5	0.78	22.7	5 500		3.5(H2S); 17 (ethylene oxide);
												60
												6.8 (bromomethane)
Cellulose nitrate		6.9				0.12	2.0 20	1.95	2.12	6 290		57.13(NH);1.76 (SO)2
Ethyl cellulose	400		30			30	20	30	30	12 000	20	705 (NH3 ); 204 (SO 2 );
Ethyl cellulose	400					8.4	87	26.5	41.0	12 000		705 (NH3 ); 204 (SO 2 );
												4200 (ethylene oxide)
Gutta percha						2.17	14.4	6.16	35.4	510
Natural rubber						9.43	52.0	23.3	15.3	2 290		15.7 (CO); 30.1 (CH);4
												1.68 (CH3 8); 98.9 (CH2 2 );
Nylon 6	0.53									177		550 (CH3C #CH); 3.59 (SF6)
					20	30		30	30			30	20
						0.009 5		0.038	0.10			0.33(H2S); 1.2 (NH 3 );
												60
Nylon 11	1.95											0.84	(CH 3Br)
					30		30		40			30	40
							1.78		1.00			0.344 (Ne); 0.189 (Ar);
												50
												13.6	(propyne)
Poly(acrylonitrile)								0.000 2	0.000 8	300
66.10

TABLE 10.5 Gas Permeability Constants (10			10 P ) at 25C for Polymers and Rubbers (						Continued	)

											Gas

Polymer or rubber		He		N	2			H 2	O	2	CO 2		H 2O			Other
Polymer or rubber		He		N	2			H 2	O	2	CO 2		H 2O			Other

Acrylonitrile-styrene copolymer
Acrylonitrile-styrene copolymer
(66 : 34)									0.048		0.21		2 000
Poly(1,3-butadiene)				6.42			41.9		19.0		138.0		5 070
Poly ( cis -1,4-butadiene)		32.6		19.2												19.2 (Ne); 41.0 (Ar)
Butadiene-acrylonitrile copolymer
(80 : 20)		12.2			1.06			15.9		3.85	30.8					24H.);82 2 (C7.7 (propyne)
Butadiene-styrene copolymer (80 : 20)	13.4		1.71											5.01 (Ne); 4.49 (Ar)
Butadiene-styrene copolymer (92 : 8)	22.9		5.11										9.70 (Ne); 12.7 (Ar)
Polychloroprene			1.2			13.6			4.0		25.8				3.79 (Ar); 3.27 (CH)4
Polyethylene, low-density	4.9		0.969			12.0		30	2.88		12.6		90			2.88 (CH);4 6.81 (CH2 6);
Polyethylene, low-density	4.9		0.969			12.0			2.88		12.6		90			2.88 (CH);4 6.81 (CH2 6);
																9.43 (CH3 8); 1.48 CO);
																490 (ethylene oxide);
																14.4 (propene); 42.2 (propyne);
																	60
																0.170 (SF6); 472 (CH 3Br)
Polyethylene, high-density	1.14		0.143			3.0		20	0.403		0.36		12.0			0.388 (CH);4	0.590 (CH2 6);
Polyethylene, high-density	1.14		0.143			3.0			0.403		0.36		12.0			0.388 (CH);4	0.590 (CH2 6);
																0.537 (CH3 8); 0.008 3 (SF6);
																1.69 (Ar); 4.01 (propene)
Poly(ethylene terephthalate)
Crystalline	1.32		0.006 5					20	0.035		0.17		130				60
Crystalline	1.32		0.006 5					3.70	0.035		0.17		130			0.003 2 (CH);4 0.08 (CH 3Br)
Amorphous	3.28		0.013						0.059		0.30					0.009 (CH 4)
Poly(ethyl methacrylate)	6.82		0.220						1.15		5.00		3 200		2.98 (Ne); 0.565 (Ar); 0.370 (Kr);
Isobutene-isoprene copolymer																3.83 (HS);2	0.000 001 65 (SF6)
Isobutene-isoprene copolymer
(98 : 2)	8.38				0.324			7.20		1.30	5.16		38	110		50
(98 : 2)	8.38				0.324			7.20		1.30	5.16			110		13.6 (C3H 8)
Isoprene-acrylonitrile copolymer
(76 : 24)			7.77		0.181			7.41		0.852		4.32
67.10

TABLE 10.5 Gas Permeability Constants (10			10 P		) at 25C for Polymers and Rubbers (				Continued	)
											Gas

Polymer or rubber			He			N	2	H 2	O	2	CO 2	H 2O		Other

Isoprene-methacrylonitrile
copolymer (76 : 24)						0.596		13.6	2.34		14.1
Methacrylonitrile-styrene-
butadiene copolymer (8	8 : 7 : 5)								0.004 8		0.014	600
Poly(methylpentene)	101					7.83		136	32.0		92.6
Polypropylene	38		20				30	20		30	30	51	20	20
Polypropylene	38					0.44		41	2.3		9.2	51	0.33 (H2S); 9.2 (NH 3 )
Silicone rubber, 10% ﬁller	233		0			0		0	0		3 240	35	0	0
Silicone rubber, 10% ﬁller	233					227		464	489		3 240	43 000	191 (Ne); 550 (Ar);
													1 0200 (Kr); 2 550(Xe);
													19 0000 (butane)
Polystyrene		18.7				0.788		23.3	2.63		10.5	1 200
Poly(tetraﬂuoroethylene)					1.4			9.8	4.2		11.7		15.7 (NO 2 ); 37.5 2(NO 4)
Poly(triﬂuoroethylene)	6.8			20		0.003		20		40	40	0.29	0
Poly(triﬂuoroethylene)	6.8					0.003		0.94	0.025		0.048	0.29	1.2(ethylene oxide);
Poly(vinyl acetate)	12.6												4.60 (CH 3Br)
				30				30		30			30	30
								89	0.50				2.64 (Ne); 0.19 (Ar);
													30	30
													0.078 (Kr); 0.050 (CH 4)
Poly(vinyl alcohol)	0.001			30			14	0.009	0.008 9		23		0.007 (HS);2	0
Poly(vinyl alcohol)	0.001					0.001		0.009	0.008 9		0.001		0.007 (HS);2	0.002
													(ethylene oxide)
Poly(vinyl chloride)	2.05					0.011 8		1.70	0.045 3		0.157	275	3.92 (Ne); 0.011 5 (Ar);
Poly(vinylidene chloride)	0.31								0.005 30			0.5	0.028 6 (CH)4
				34			30				30		30	60
						0.000 94					0.03		0.03 (H2S); 0.008 (CH 3Br)

68.10

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