SEMI International Standards
Standards New Activity Report Form (SNARF)
Date Prepared: 02/06/2012Revised (if Applicable):

Document Number: 5385
SNARF for: New Standard: Test Method for the content of Vinyl Acetate (VA) in Ethylene-Vinyl Acetate (EVA) applied in PV modules—Thermal Gravimetric Analysis (TGA)

Originating Global Technical Committee: Photovoltaic
Originating TC Chapter: China
Task Force (TF) in which work is to be carried out: Crystalline Silicon PV Module Task Force
Note: If a new task force is needed, also submit a task force organization form (TFOF)

1. Rationale:
a. Describe the need or problem addressed by this activity.
(Indicate the customer, what benefits they will receive, and if possible, quantify the impact on the return on investment [ROI] if the Document is implemented.)
EVA (poly ethylene-vinyl acetate) is one of the most important encapsulation materials in the whole photovoltaic modules and sold in varieties on the market. When choosing the appropriate EVA, it’s not only the cost but, the more important problem is quality and life for the photovoltaic manufacturer.
EVA performance depends mainly on its molecular weight and the content of VA (Vinyl Acetate). When the molecular weight is constant, with the increase of the content of VA, the elasticity, softness, cohesiveness, compatibility and transparency of EVA will improve. When the content of VA becomes low, the performance of EVA is equivalent to polyethylene.
Therefore, choosing the appropriate EVA is critical. These methods for testing the content of VA will help fill the gaps in the international standards.

b. Estimate effect on industry.
1: Major effect on entire industry or on multiple important industry sectors
Sector or Company Information:

c. Estimate technical difficulty of the activity.
II: Some Difficulty - Disagreements on known requirements exist but developing consensus is possible

2. Scope:
a: Describe the technical areas to be covered or addressed by this Document development activity. For Subordinate Standards, list common concepts or criteria that the Subordinate Standard inherits from the Primary Standard, as well as differences from the Primary Standard:
This standard belongs to the photovoltaic industry. The main test methods of the proposal are as follows:
1) The Infrared spectroscopy is the most commonly used method. Series of different contents VA of the standard sample are prepared, and then standard curve is drawn. When EVA is being measured, the result VA’s content can be obtained from the standard curve. This testing method is simple but the accuracy of standard curve is not high.
2) The chemical analysis is the original method. It occurs at the saponification reaction, and then calculates the content of VA by using titration. The result of this method is always volatility, and there are many disadvantages of this method, such as maneuverability, and accuracy, etc.
3)TGA (Thermogravimetric Analysis)method is putting sample in a oven, then change the temperature, and measure the weight’s difference . When decomposition, combination, desorption, absorption, dehydration or sublimation occurs, weight fluctuation will be observed in a diagram. While heating, EVA is subjected into a series of chemical reactions. The acetic acid from EVA will be decomposed at the first step. The content of VA is calculated through the relationship between VA and acetic acid. As a result, the content of VA can be tested easy, fast and accurate.
As a result, by using TGA. test can be performed accurately and better in the same level.

b: Expected result of activity
New Standard

For a new Subordinate Standard, identify the Primary Standard here:

For Standards, identify the Standard Subtype below:

Miscellaneous (describe below):

3. Projected Timetable for Completion:

a: General Milestones
a. Activity Start: 01/20/2012b. 1st Draft by: 09/01/2012
c. (Optional) Informational Ballot by: d. Letter Ballot by: 03/30/2013
e. TC Chapter Approval By:08/01/2013

4. Liaisons with other Global Technical Committees/TC Chapters/Subcommittees/TFs:
List global technical committees, TC Chapters, subcommittees, or task forces in your or other Regions/Locales that should be kept informed regarding the progress of this activity. (Refer to SEMI Standards organization charts and global technical committee charters as needed.)
North America PV Materials Committee,
Europe PV Materials Committee,
Japan PV Materials Committee,
Japan PV Automation Committee,
Europe PV Automation Committee,

b. Intercommittee Ballots:

Identify the recipient global technical committee(s):

5. Safety Considerations:
The resulting document is expected:
NOT to be a Safety Guideline

NOTE FOR "to be a Safety Guideline": When all safety-related information is removed from the Document, the Document is NOT technically sound and complete - Refer to Section 15.1 of the Regulations for special procedures to be followed.

NOTE FOR "NOT to be a Safety Guideline": When all safety-related information is removed from the Document, the Document is still technically sound and complete.

6. Intellectual Property Considerations:
a. For a new Standard or Safety Guideline and for any part to be modified or added in a Revision of published Standards and Safety Guidelines:
the use of patented technology or a copyrighted item(s) is NOT required

If "patented technology is intended to be included in the proposed Standard(s) or Safety Guideline(s) " is selected above, then also check one:

b. For Revision, Reapproval, Reinstatement, or Withdrawal of existing Standard(s) and Safety Guideline(s):

c. The body of the Document and any Appendices, Complementary Files, Related Information sections, or Various Materials that may or may not be a part of the Document by reference:
will NOT include copyrighted material

NOTE FOR "the use of patented technology or a copyrighted item(s) is NOT required": If in the course of developing the document, it is determined that patented technology or copyrighted item(s) must be used to comply with the standard or safety guideline, the provisions of Section 16 of the Regulations must be followed.)

NOTE FOR "will include reproduced copyrighted material": A copyright release letter must be obtained from the copyright owner.

7. Comments, Special Circumstances:

8. TC Member Review:

Member Review Start Date; None.
Member Review End Date: None.

NOTE FOR ‘TC Member Review’ is required by the Regulations for a period of at least two weeks
before approval of a new, or a major revision of an existing, Standard or Safety Guideline. (See Regulations 8.2.1)
9.. SNARF Approval Dates:
TC Chapter or GCS02/06/2012
Recorded in TC Minutes02/10/2012
Attach Pictures and Files here: