Diffusion film

1.Application scope:

     This product is used in LED glass lamp tube casing engineering, mainly to diffuse point light source, marking products, play an insulating role, to protect glass rupture from harm human.

Compared with PC lampshade, it has the advantages of low price, no bending after long time use, good heat dissipation effect, excellent diffusion and light transmittance performance.


 

2.Tube size and shrink ratio standard:

Lamp Spec

ID

Flat width

Thickness

Lateral shrink ratio

Longitudinal shrink ratio

(mm)

(mm)

(mm)

(mm)

(%)

(%)

T8(26.0±0.5)

F26

44.0±0.3

0.10±0.02

40±5

6-12

Remark: The color and size can produced according to customer requirements.


3.Tube performance standard and test method:

No.

Item

Performance requirements

Test method

1

Appearance

Stain, damage, needle hole, uneven color, foreign or mixed intrusion and mechanical damage shall be banned. (as per abnormal limit signed by both parties)

Cut the diffusion film into 10mm
Visual investigation under fluorescent lamp

2

Appearance

(unmelted material)

See 《Sundries Testing Chart》 in Appendix 1.

Cut the diffusion film into 10mmVisual investigation under fluorescent lamp, compare it with records in 《Sundries Testing Chart》.

3

Insulation resistance

It won’t be punctured under 2.0KV.AC×60s.

Test it with pressure resistance tester.

4

Heat resistance

Capacitor covered with tube and put into oven, no crack or color fading happened after 180℃× 15 minutes

High-temperature oven test

5

Solvent resistance

No obvious abrasion on the surface

Dip 100mm printed tube into isopropanol for 60±10s; clean the surface lightly with brush. (No direct contact with organic solvents such as acetone, ethyl acetate and dichloromethane.)

6

Density

1.2-1.4(g/cm3

ASTMD792

7

Tensile strength

>107(N/m2)

ASTMD638

8

Break elongation

>62.0%

ASTMD638

9

Water absorption rate

<2.0%

ASTMD570

10

Dielectric strength

>15(KV/mm)

ASTMD149

11

Surface resistivity

>107(Ω)

ASTMD257

12

Volume resistivity

>1014(Ω▪mm)

ASTMD257

13

Fire resistance

ATF

UL224

14

Light transmittance

89.0±2.0%

1.Fix the standard lamp (test luminous flux A for glass lamp tube without casing; luminous flux B for glass lamp tube covered with diffusion film; transmittance=B/A)

2. under 60℃ 10,000 hours, the change in light transmittance of the same lamp tube covered with film is ±2.0% (the product shall not be applied when ambient temperature above 90℃, or it may cause the materials crystallize and a decrease of 5.0% in light transmittance).

15

Results of temperature test

1. LED light diffusion film has actually lighted the lamp for 8000hr, no YI value and light transmittance changed on the PET diffusion film after test.


4.Use method:

    Cut the light diffusion film as per the length of glass lamp tube, and apply the film to cover the glass tube. Then put the processed glass tube into constant-temperature tunnel oven to shrink under 70-75℃ for 5-8 minutes. Check if there is any abnormity on the outlook of the tube after cooled, then assemble.

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