Physical and Thermal Properties

1. General Physical Properties

Table 1 summarizes the physical properties of Lumirror™.
The thickness of each sample used for measurement was #25 (25 μ).

Table 1. Lumirror™ General Physical Properties

Property	Measurement Value	Unit	Measurement Method
Density	1.40 （1.390 to 1.408）	g/cm2	JIS K 6760 - 71 (n–Heptane, CCI4)
Melting Point	263	°C	With heating stage Observed using a microscope
Specific Heat	0.32	cal/g/°C
Heat Transfer Coefficient	3.36 × 10-4	cal/cm/sec/°C
Moisture Expansion Coefficient	1.2 × 10-5	cm/cm/%RH
Thermal Expansion Coefficient	1.5 × 10-5	cm/cm/°C	ASTM D 696- 70
Refractive Index	1.66		ASTM D 542 - 70 (Abbe, 20°C)
Light Transmittance	85	%	JIS K 6714 - 58

2. Change in Hygroscopic Rate Based on Relative Humidity

Fig. 1 shows the changes in the hygroscopic rate as the amount of humidity Lumirror™ is exposed to increases.
Measurements were taken at 25°C.

3. Water Absorption Rate for Various Product Numbers

Fig. 2 shows the water absorption rate of various Lumirror™ product numbers when immersed in 20°C water for 24 hours and when immersed in 100°C boiling water for 2 hours.
The measurement method is the Federal Test Method Std. NO. 406 Method 7031.

4. Drying Curve

Lumirror™ was dried at 120°C until it reached a state of equilibrium, and then it was allowed to achieve sufficient equilibrium at room temperature in either 80% RH or normal humidity. After, the change in weight and the change over time were measured and recorded for both #75 (75 μ) and #188 (188 μ) as the samples were once again dried at 120°C. The results of these measurements are shown in Fig. 3.

5. Moisture-related Dimensional Stability

Fig. 4 shows the dimensional change of Lumirror™ as it is exposed to increasing humidity.
The moisture expansion coefficient of Lumirror™ is calculated from Fig. 4 as follows.
1.2 × 10^-5 cm / cm / %RH

6. Thermal Dimensional Stability

Fig. 5 shows the dimensional change of Lumirror™ #50 (50 μ) as it is exposed to temperatures from room temperature up to around 100°C.
The thermal expansion coefficients of Lumirror™ around room temperature are as follows.
The measurement method is ASTM D 696-70.
MD (Vertical): 1.2 × 10^-5 cm / cm / °C
TD (Horizontal): 1.6 × 10^-5 cm / cm / °C

7. Heat Shrinkage for Various Product Numbers

Table 2 shows the heat shrinkage for various Lumirror™ product numbers at 150°C for 2 hours.
The measurement method uses a reading microscope in accordance with JIS C 2318-72.

8. Changes in Heat Shrinkage Rate Based on Temperature

Fig. 6 shows the heat shrinkage rate of #50 (50 μ) Lumirror™ at temperatures from 90 to 190°C.
The measurement method is JIS C 2318-72.

9. Water Vapor Permeability for Various Product Numbers

Table 3 shows the water vapor permeability for various Lumirror™ product numbers.
The measurement method was JIS Z 0208-73 with measurement conditions of 40°C and 90% RH.

10. Comparison of Water Vapor Permeability with Other Films

Even among the various plastic films available, Lumirror™ has an extremely low water vapor permeability.
Table 4 shows the water vapor permeability of various plastic films for the purpose of comparison.
Lumirror™ has the same degree of permeability as polyethylene film.
The measurement method was JIS Z 0208-73 with measurement conditions of 40°C and 90% RH.

Table 4. Water Vapor Permeability of Various Plastic Films

Film	Sample Thickness	Water Vapor Permeability
	μ	g / m2 / 24hr / 0.1mm
Lumirror™	25	6.9
TORAYFAN™ BO *	22	1.2
High pressure polyethylene	30	5
Stretched polycarbonate	25	35
Soft polyvinyl chloride	35	23
Stretched vinyl chloride, vinylidene chloride copolymer	30	1.5
Polyvinyl alcohol	20	240
Cellulose triacetate	135	410
Moisture-proof cellophane	32	11

• Toray biaxially oriented polypropylene film

11. Comparison of Gas Permeability with Other Films

Even among the various plastic films available, Lumirror™ has an extremely low gas permeability, exhibiting excellent characteristics for food packaging, etc. Table 5 shows the oxygen, nitrogen, and carbon dioxide gas permeability of various plastic films for the purpose of comparison.
The measurement method was ASTM D 1434-72 at a measurement temperature of 25°C. For any film, the permeability is in the order of carbon dioxide, oxygen, and nitrogen, with a ratio of 3 to 5, 1, and 1/6 to 1/3.

Table 5. Gas Permeability of Various Plastic Films Units: cc（NTP）/ m² / 24hr / 0.1mm / atm

Film	Gas Permeability
	Oxygen	Nitrogen	Carbon Dioxide
Lumirror™	19	4.2	74
TORAYFAN™ NO *1	860	160	2670
TORAYFAN™ BO *2	400	84	1300
High pressure polyethylene	2000	720	8900
Low pressure polyethylene	520	180	2270
Stretched polystyrene	1140	180	5640
Stretched hard polyvinyl chloride	24	5.1	63
Stretched vinyl chloride, vinylidene chloride copolymer	17	-	91

• 1 Toray unstretched polypropylene film
• 2 Toray biaxially oriented polypropylene film

12. Comparison of Organic Solvent Vapor Permeability with Other Films

Table 6 shows the organic solvent vapor permeability of Lumirror™ and various other plastic films.
The measurement method was JIS Z 0208-73 at a measurement temperature of 40°C.

• 1 Toray unstretched polypropylene film
• 2 Toray biaxially oriented polypropylene film

 

13. Thermal Degradation Stability

Lumirror™ features excellent thermal degradation stability.
The maximum usable temperature for Lumirror™ is generally 150°C. When planning to use it for long periods of time, 130°C or less is recommended.
Figures 7 and 8 show the changes in tensile strength and elongation of Lumirror™ after heat treatment at a typical temperature along with the heat treatment time.
The thickness of each sample used for measurement was #38 (38 μ).

14. Heat Resistant Life

With the initial tensile strength and elongation of Lumirror™ being 100%, Figures 9 and 10 show the amount of time taken for those values to drop to 50% and 10% (representing the change in lifespan) based on temperature.
The thickness of each sample used for measurement was #50 (50 μ).

Lumirror™ Technical Information

• Mechanical Properties
• Physical and Thermal Properties
• Electrical Properties
• Chemical Properties