Solar Glass

Solar Glass Info Sheet

Textured PV Glass

Targray offers a superior PV glass solution to module manufacturers. Our Low Iron Glass has excellent solar transmittance at different angles of incidence and is fully tempered for enhanced safety and durability. The glass’ PV specific texture allows for better adhesion to substrates and improved light trapping properties.

The Targray Advantage

Targray has a proven track record in the PV industry and has established key, strategic partnerships with global suppliers of best-in-class, cutting-edge materials. Our PV Glass is one of the highest quality and performance products in the industry. Key features include:

• Highest quality raw materials to create outstanding optical and mechanical characteristics of the finished Glass.
• Best in class Manufacturing technologies are used to ensure reliable and controllable processes for melting, forming, annealing and tempering of glass.

1.  Glass Properties
1.1	Maximum Fe2O3 content				120 ppm
1.2	Energy Transmittance				≥ 91.8 %
1.3	Weight per mm				2.5 kg/m2
1.4	Surface patterns				Prismatic / Matt, Matt / Matt
2.  Dimensions and Deviations
2.1   Maximum dimensions: 2,400 x 1,100 mm
Thickness		Allowable deviation (mm) vs. glass length (L)
		L ≤ 1000			1000 < L ≤ 2000		2000 < L
3.2 mm; 4.0 mm		+1, -2			+1, -2		± 4
Difference between two diagonals		≤ 3			≤ 3		≤ 4
2.2   Thickness and allowable deviation (Other dimensions and deviations are available)
Thickness					Allowable deviation (mm)
3.2 mm					± 0.20
4.0 mm					± 0.30
2.3   Various edge-finishes available: polished, ground or seamed edges with safety corners.
3. Visual Glass Properties
Chip		The number of chips allowed per piece of glass per meter, with: • length not exceeding 10 mm, • depth from glass edge to glass face not exceeding 2 mm and • depth from glass face into thickness not exceeding 1/3 of the thickness.					1
Scratch		Width ≤ 0.1 mm, Length ≤ 50 mm 0.1 mm < Width ≤ 0.5 mm, Length ≤ 50 mm Width > 0.5 mm					4/m2 1/m2 Not Allowed
Bubble		0.5 mm ≤ Length ≤ 1.5 mm 1.5 mm < Length ≤ 3.0 mm 3.0 mm < Length ≤ 5.0 mm Length > 5.0					6 x S* 3 x S* 1 x S* Not Allowed
Stone							Not Allowed
Check / Crack							Not Allowed
Pock		Not obviously seen when viewing from 600 mm distance					Allowed
Line							Not Allowed
Impression		Impression					Not Allowed
Pattern Disturbance		Visible					Not Allowed
* S is the size of the piece of glass in square meters, rounded to 0.01. The allowable number of bubbles is a derived figure resulting from the product of S and the listed coefficient.
4. Thermal Properties
Heat resistance					> 200° C
Softening Point					745° C
Annealing Point					511° C
Stain Point					413° C
5. Mechanical Properties
Compressive strength					700-900 N/mm2
Bending strength (fully tempered)					95 N/mm2
Tensile strength					62 N/mm2
Thermal expansion coefficient (CTE)					8.997 x 10-6/ °C
Minimum fragments (test area 50 x 50 mm, longest fragment 75 mm)					≥ 40
Surface condition					0.4 - 1.2 microns (matt)
6. Planarity (fully tempered)
General bow / warp					1.5 mm/m
Local bow / warp					0.3 mm/300 mm

Anti-Reflective Glass

AR Glass Info Sheet

A Cost-Effective Way to Improve the Performance of PV Modules

Targray’s premium anti-reflective glass provides you with another cost-effective way to increase the efficiency and performance of your solar modules.

The AR coating has been developed specifically for PV applications: it reduces solar energy lost from sunlight reflection and improves light transmittance by more than 2% through the portion of the solar spectrum generating the greatest PV effect. This can result in efficiency gains in power output of up to 4 - 6% over incidence at different angles. As an additional benefit, the anti-reflective coating increases product lifetime by reducing heat build-up within the module.

Our cutting-edge AR technology applies single-side coating on premium solar glass for high-resistance and durability in harsh environmental conditions.

Quality certificates and customer references are available upon request.

Transmittance (%) vs. Solar Spectrum Wavelength (nm)

General Properties of Anti-Reflective Glass

Coating Type		Single Side Coating
Material		SiO2
Solar Energy Transmittance		improvement ≥ 2 %

Coating Properties

Pinholes (Permitted Quantity per m2)
≤ 0.8 – 1.2 mm		Unlimited, No Clusters
1.2 – 1.6 mm		Middle Part: 3; Edge Part:8
1.6 – 2.5 mm		Middle Part: 2; Edge Part: 5
> 2.5 mm		Not Permitted

Qualification Tests
Item	Testing Procedure	Applied Standards	Results
UV-exposure	> 2000 h Standard	GBIT1865-1997	Passed
Anti-acid and anti-alkali	> 48 h, No Change	GBIT9755-2001	Passed
Anti-neutral fog	> 48 h, No Change	GBIT9755-2001	Passed
Substrate adhesion	Standard Test	GBIT7748-1999	Passed
Pencil Hardness	> H	GBIT7730-1993	Anti-scratch
Visible Light Transmittance	Improve > 2%	GBIT18915.1-2	PV Modules Power Output Increase

Remarks (pinhole):
1) Cluster means in excess of 20 in the area of 100 mm;
2) Middle part means the area which is 75 mm from the glass edge, the other means edge part.