1. HMD Low CTE High Modulus/stiffness
Thinwall design for weight reduction
HMD – high modulus ductile that is clearly over the level provided by existing engineering thermoplastic

2. COEFFICIENT OF THERMAL EXPANSION
Original Length
Increasing temperature
Coefficient of Thermal Expansion (CTE)

3. CTE BETWEEN DIFFERENT MATERIALS
CTE Compare to other materials
(x 10-5 in./in./oC)
Materials a
Wood
Metal
Copper
Alu
Normal PC
Normal PPO
0.30
0.65
1.9
1.4
6.84
3.3

4. According CTE change，size of materials changed
CTE CALCULATION L
DL = a x L x DT
DL: Length change
a: CTE
L: original length
DT: temperature change area
L=1 in
a (metal) ~ 1 X 10-5 in/in-F
a (plastic) ~ 5 X 10-5 in/in-F
According CTE change，size of materials changed

5. PC CTE COMPARISON
Diffusive HMD -1
Diffusive HMD -2
ASTM E 831

6. LOW CTE MATERIALS STATS AND ADVANTAGES
Low CTE Resins
Reduced Dimensional Change after Thermal Aging
Benefits:
Low CTE resins provide an improved balance of modulus and ductility when compared to competing PC/ABS materials.
Low CTE resins allow for smaller gaps between components when compared to unfilled PC/ABS blends.
Low CTE PC
Properties:
Stiffness while maintaining ductility
Low CTE 4.3 / C
Heat capability to 122 C HDT
Excellent paintability
Minimal post mold shrinkage enhances dimensional stability
Normal CTE PC

7. HIGH BENDING MODULUS/STIFFNESS
bending strength
Under the load of the deformation and strength

8. BENDING MODULUS
Diffusive HMD -1
Diffusive HMD -2

9. HIGH MODULUS OF OPTICAL DIFFUSION
1.Diffusive HMD
2. Normal PC diffuser LUX2114

10. Temperature-Humidity Chamber
HOT AND COLD TEMPERATURES IMPACTING ON SHAPE TEST
Temperature-Humidity Chamber
Feeler Gauge
Model: ESL-02KA
Model: KT
Specification
Number of blade 32
Measurement Range mm
Specification
Temp. range
-70~150℃
Humidity range
25~98%RH
Interior volume
200L
Temp. fluctuation
0.5℃
Temp deviation
2.0℃
Humidity deviation
3.0%RH(>75%RH)，5.0%RH(75%RH)
Temp. rising rate
＜60min (from -70℃ to 150℃)
Temp. decreasing rate
＜80min (from 20℃ to -70℃)
Clever Cat Tape
Specification
Max. Length 5m

11. Thermal Shock and Flatness Test
HOT AND COLD TEMPERATURES IMPACTING ON SHAPE TEST
Thermal Shock and Flatness Test
Test Procedure
1) 25oC, Length and gap width test;
2) Put sample in the oven(-10oC,1h) and then do the length test instantly;
3) Leave sample in room temperature(25oC,1h), and then do the length test;
4) Put sample in the oven(40oC, 24h) and then do the length and gap width test instantly.
Thermal Shock Test
Length Test
Gap Width Test

12. AGING TEST PROCEDURE Diffusive HMD 老化 普通 PC
1500mm aging
1200mm aging
Power on
12hrs
test
12hrs
test
Repeat aging testing
test
12hrs
test
12hrs
Power off
Cycle temperature
Cycle temperature

13. OPTICAL TEST Integrating Sphere Feeler Gauge
Laboratory Electronic Balance
Steel ruler & vernier caliper

14. RELIABILITY TEST RESULTS
Cold and hot impact
Aging test
* 1200mm/0.6mm T8 full plastic tube light

15. OPTICAL TEST
Diffusive HMD 0.6mm/1200mm
Diffusive HMD 0.6mm/1500mm

16. OPTICAL TESTING – MASS PRODUCTION PELLETS 量产放大测试
光效测试数据
翘曲度测试数据

17. Pogo Test Machine/Pogo
PRESSURE BENDING TEST
Pogo Model: 9505S ：
Pogo Test Machine/Pogo

18. PRESSURE BENDING TEST PARAMETERS AND PROCESS
Parameter setting
Max. loading setting=30 kgf 30
Tip Diameter= 10.0 mm
Span行=480 mm
Speed setting=20 mm/min
Test Procedure
1) Lay the LED tube on the correct position to get the tube in the center; directly below pressurehead. The two ends of the tube are then fixed on the platform by double-sided tape.
2) Carry out the pogo test and observe the tube compressive behavior.

19. BENDING STRESS TEST RESULTS
The curve of pressure bending test

20. OVERALL MAIN ADVANTAGES
High modulus.
Low thermal expansion coefficient.
Thin design/weight loss.
V0 Fireproof.
The spread of the flexible degree/optical adjustment space.