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EVA Film

Product Information

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Properties Units Test Method EVAF-FC
Type of cure      Fast cure
Surface finish      Embossed both sides
Density g/cm3  ASTM D1505
VA content  %  FPC method
Gel content  %  FPC method  >85
UV cutoff wavelength  nm  FPC method  360
Water absorption  %  ASTM D570
Hardness  Shord D
ASTM D2240
Adhesion to glass  N/cm  FPC method  >60
Adhesion to tedlar  N/cm  FPC method  >60
Optical transmission (280-1100 nm)  % UV-VIS
Shrinkage rate (100℃, 3 Min)  %                          
 FPC method        
 <3/<1 (MD/TD)
       Uncured Cured
Volume resistivity
   >1.0x1014   >1.0x1014
Dielectric constant
     3.36 3.24
Thermal conductivity
 W/m-K  Probe method
 0.27 0.26
Water vapor transmission rate
 g/24hr-m2  ASTM E96
 <20 <20
Tensile strength at break  Kg/cm2  ASTM D882
 80  220
Elongation at break  %  ASTM D882
 >800  >500
Damp heat test (85℃, 85% RH, 1000 hrs)


 FPC method
 -  <3

Supply Specifications
Thickness (micron)                 
200 - 800 μ
Width (mm) 600-1200 mm
Length (Meter/Roll) 100 M

Delivery package
9 rolls per pallet

Date of valid
6 months from delivery (in package)
1 day after unpacked

Storage requirement
Below 25

Relationship of temperature-crosslinking-time

*Above curve is generated from laboratory data. When apply to module encapsulation, time needed for materials heating must take into consideration. Encapsulate before crosslinking reaction to avoid cell breakage or module warp. Give enough crosslinking time to avoid excess remain of crosslinking agent.

Test methods:

1. Thickness
*Apparatus: on-line capacitance sensor measuring thickness instrument
*No. of test: 1 time/10 secs
*Unit of test: 0.001mm
*Test procedure: automatic round trip scanning
*test condition: 23

2. Width
*Apparatus: measuring tape
*No. of test: 1 time/ 1 hour
*Unit of test: 1mm
*Test procedure: measure the width by hand along machine direction
*test condition: 23

*Apparatus: automatic counter
*No. of test: 1 time/ 1 roll
*Unit of test: 1m
*Test procedure: automatic count by machine
*test condition: 23

4. Shrinkage
*Apparatus: electric vernier calliper
*No. of test: 1 time/ 8 hours
*Unit of test: 1mm
*Test procedure:
    (a) The EVA film cut to 190 x 190 mm specimen
                            (b) The specimen put onto 200 x 200 mm teflon sheet that sprinkle talc
                            (c) Put the specimen into 120±1℃ oven, 5 minutes
                            (d) Measure the change of dimension on transverse and longitude

5. Peel strength

*Apparatus: MTS insight testing machine with 90 degree grip
*No. of test: 1 time/ 8 hours
*Unit of test: N/cm
*Test specimens:
                            (a) 15 x 15 cm AFG solite glass
                            (b) Laminated glass/EVA film/
tedlar back sheet with laminator on conditions as follows.
                                  Temp. 145
, pre-heating 2 min, vacuum 2 min, holding 10 min.
*Test procedure: Specimen for peel test width 25mm, speed of testing: 50mm/min

6. Gel content
*Apparatus: Analytical balance, accurate to 0.0001 g. vacuum oven
*No. of test: 1 time/ 8 hours
*Unit of test: gram
*Test specimens:
                            (a) 7.5 x 7.5 cm teflon sheet
                            (b) Laminated Teflon sheet/EVA film
with laminator on conditions as follows.
                                  Temp. 145
, pre-heating 2 min, vacuum 2 min, holding 10 min.
*Test procedure:
                            (a) Prepare a specimen holder: cutting a pieces of 120 mesh stainless steel cloth.
                                  Fold this into form a 40mm x 40 mm pouch. Weigh this pouch (W1)
                            (b) Place approximately 0.3g of the ground and scrrened cured EVA sample in the
                                  weighed pouch. Weigh the pouch and specimen (W2)
                            (c) Fill a round-bottom flask with 800ml xylene (dissolve 1% of 1010 antioxidant) to
                                 immerse the 120 mesh cage and sample completely
                            (d) Boil the xylene vigorously enough to ensure good agitation of the solution.
                                  Extract the specimen for 5 hr. at 20 to 40 drops/min from the condenser
                            (e) After extraction, place the cage and specimen immediately in a vacuum oven.
                                 Preheat it to 160
. Dry the specimen for 3hrs, cool the specimen in desiccators for 15
                                 min, then weigh (W3)

                            (f) Calculation: