Knowde Enhanced TDS
Identification & Functionality
- Product Type
- Technologies
- Product Families
Features & Benefits
- Labeling Claims
- Ready-to-Use Product Features
- Characteristics
Mara® Glass MGLA is made without the use of BPA/ BPS, and is silicone-free. For silicone-free products it is important to use only thoroughly cleaned stencils, squeegees, ink pumps, tubes (in the case of an automatic ink supply), and injectors for the manual ink filling of the stencil, etc. If cleaning is carried out with automatic screen washing systems, we recommend prior to printing an additional manual cleaning with a fresh cleaner not having had any contact with ink residues containing silicone.
Ink Adjustment
The ink should be stirred homogeneously before printing and if necessary during production. Mara® Glass is a 2-component ink system. Prior to printing, it is essential to add hardener / adhesion modifier in the correct quantity and to stir homogeneously. The mixing ratio is as follows: MGLA + 10% Hardener HT 1 + 10% Adhesion Modifier UV-HV 7 When using hardener, the processing and curing temperature must not be lower than 15°C as irreversible damage can occur. Please also avoid high humidity for several hours after printing as the hardener is sensitive to humidity.
Drying
Parallel to physical drying, i. e. the evaporation of the solvents used, the actual hardening of the ink film is caused by the chemical crosslinking reaction between ink and hardener. The drying times vary according to substrate, ink deposit, humidity, drying conditions, and the auxiliaries used. For multi-color printing, please note that the previously printed ink films should not be entirely cured before the consecutive ink film is printed on it. Only after all ink films have been applied, they should be baked. The following values, related to the object temperature, concerning progressive cross-linking reactions (hardening) of the ink film (thickness 4 -12 µ) are recommended: Intermediate drying: Overprintable after 3-5 min. / 160 -170°C Final drying: 20 - 30 min. / 180 - 200°C.
Fade resistance
Mara® Glass MGLA contains a highly weatherresistant binder and pigments of high fade resistance (blue wool scale 7-8). MGLA is used for second surface printing and suited for a 5- year vertical outdoor exposure, referred to the middle European climate. The outdoor durability is reduced in climates with a higher level of sunlight exposure. The above mentioned resistance values are applicable provided that the ink is processed correctly, leading to proper adhesion and scratch resistance after cross-hatch tape tests.
Stress resistance
After proper and thorough drying, the ink film exhibits outstanding adhesion as well as rub and scratch resistance.
Applications & Uses
- Markets
- Compatible Substrates & Surfaces
- Field of Application
Substrates
Mara® Glass MGLA is suited for screen printing onto flat glass like:
• Soda-lime glass
• Optiwhite (white glass)
• Borosilicate glass
• Gorilla® glass (Corning)
• Xensation ™glass (Schott)
Ideal printing conditions include a room temperature of 20-25°C and 45-60% humidity. Equal surface tension of at least 40 mN/m ensures good adhesion. Furthermore, the glass surface must be clean and absolutely free of graphite, silicone, dust or grease (e.g. finger prints). Flame or silane pre-treatment right before the start of the printing process generally improves adhesion. Since all the print substrates mentioned may be different in printability even within an individual type, preliminary trials are essential to determine the suitability for the intended use
Field of use
Mara® Glass MGLA is used for second surface decoration on glass for flat input systems used outside, or partly outside. This may include intercommunication systems, ship control systems, or vending machines. MGLA is also suited for the making of laminated glass, e. g. with PVB or EVA .
Technical Details & Test Data
- Pre-reaction time
Pre-reaction time It is recommended to allow the ink/hardener mixture to pre-react for 15 minutes.
- Technical Details
Float glass decorated with multi-layered prints has been tested internally as below:
Cross Hatch Test: DIN EN 2409, ASTM 3359-02
Humidity resistance:
• Condensation Water Test 70°C / 100% RH / 30 min.
• Cold Water Immersion Test / 24 h
• Composite temperature / humidity cyclic test according to IEC 60068-2-38 (10 cycles)
Resistivity survey Teraohmmeter TO 3 Mara® Glass MGLA 180: > 10+12Ohm
Weather resistance: Xenon test, compliant with DIN EN ISO 4892-2, incl. weathering
Test device: Q-Sun XE-3-HS Spectral irradiance: 340 nm / 0.51 W/m² Radiant energy density: 100 h = 183.6 kJ/m²
Material: Float glass / printed on air side Application: Second Surface
Delta E-deviation after 5000 h (DE 2000):Glass quality Optiwhite Greenish Opaque Black 180 1.04 0.67 Opaque White 170 0.58 - Auxiliaries
PV Thinner 10-20% SV 1 Retarder 10-15% UV-HV 7 Adhesion Modifier 10% HT 1 Hardener 10% VM 1 Leveling Agent 0.5-2% UR 3 Cleaner (flp. 42°C)UR 4 Cleaner (flp. 52°C)UR 5 Cleaner (flp. 72°C)Hardener HT 1 and Adhesion Modifier UV-HV 7 must be added to the ink shortly before use. The Hardeners are sensitive to humidity and are always to be stored in a sealed container. The recommended mixing ratio may be adjusted according to the requirements: HT 1 promotes the chemical and mechanical resistance of the ink film, while UV-HV 7 promotes the adhesion. Thinner and/or retarder is added to the ink/ hardener mixture to adjust the printing viscosity. For slow printing sequences and fine motifs, it may be necessary to add retarder to the thinner. For an additional thinning of the ink containing retarder, only pure thinner should be used. Printing Modifier VM 1 (silicone-free) can be added to rectify flow problems. An excessive amount reduces the intercoat adhesion. The cleaners UR 3 and UR 4 are recommended for manual cleaning of the working equipment. Cleaner UR 5 is recommended for manual or automatic cleaning of the working equipment
Printing Parameters
All types of commercially available polyester fabrics and solvent-resistant stencils can be used. For a good opacity on colored substrates, we recommend a mesh count between 68-64 and 100-48, for printing fine details 120-34 to 140-31. A suitable mesh count for thin ink films is 165-27.
Packaging & Availability
- Range
High Opaque Shades 170 Opaque White 180 Opaque Black
Storage & Handling
- Pot Life
The ink/hardener mixture is chemically reactive and must be processed within 6 - 8 h (referred to 20-25°C and 45-60% RH). Higher temperatures reduce the pot life. If the mentioned times are exceeded, the ink's adhesion and resistance may be reduced even if the ink still seems processable.
- Shelf Life
Shelf life depends very much on the formula/ reactivity of the ink system as well as the storage temperature. It is 2 years for an unopened ink container if stored in a dark room at a temperature of 15-25°C. Under different conditions, particularly higher storage temperatures, the shelf life is reduced. In such cases, the warranty given by Marabu expires.