The acrylic adhesive is a clear purplish viscous solution of an acrylic polymer in methyl methacrylate. The adhesive polymerizes on exposure to light.
Acrifix acrylic adhesives are intended for use on clear acrylics including PLEXIGLAS GS, PLEXIGLAS XT and parts made of PLEXIGLAS moulding compound. The acrylic adhesives can also be used on other clear plastics such as CAB, PC and PS.
Preferably for transparent edge and area bonds of clear acrylics, i.e. PLEXIGLAS® GS, PLEXIGLAS® XT and parts made of PLEXIGLAS® moulding compound, but also for other clear plastics such as CAB, PC and PS.
Viscosity; Brookfield II/12/20°C: 1800±200 mPa • s
Density/20°C: ~ 1.02 g/cm3
Refractive index nD20: ~ 1.44
Colour: clear, slightly purple
Flash point DIN 53213: ~ 10°C
Solids content: 32 ± 2%
Storage stability: 2 years after filling, if correctly stored
THINNER AND CLEANER 30max. 10%
Cleaning agents for equipment:
THINNER AND CLEANER 30 or ethyl acetate
Polymerization by UV light
UV Light source / Curing period (at 25°C)
• Fluorescent lamp, illuminant 25, 15 to 30 min.
• Superactinig UV-A fluorescent lamp, e.g. Philips TL .../05, 10 to 15 min.
• Tanning studio UV-A fluorescent lamp, e.g. Philips TL .../09, 10 to 15 min.
• Diffuse ambient lighting, illuminant 25, 1.5 to 3 hrs.
• Sunlight, 10 to 20 min.
200 g in glass vessel exposed to diffused ambient lighting ˜30 min (at 25°C)
Safety Measures and Health Protection
Labelling in accordance to Directive 1999/45/EC: Highly flammable (F), Irritant (Xi). Contains methyl methacrylate. Irritating to eyes, respiratory system and skin. Sensitization by skin contact possible. Keep away from sources of ignition and do not smoke. Avoid contact with skin. In the event of contact with eyes, rinse immediately with plenty of water and consult a doctor. Wear suitable protective gloves.
Storage / Transport
Keep container tightly closed in a cool place protected against light.
Preparing the Parts to Be Bonded
Degrease the surfaces to be bonded with water containing a wetting agent (washing- up liquid), or with THINNER AND CLEANER 30. Internally stressed parts must be annealed before bonding in order to avoid stress cracking.
The annealing conditions depend on the type of material, the degree of forming and the thickness of the parts to be bonded. Parts made of extruded and injection-moulded acrylic should be annealed as a matter of principle. Typical annealing times – also for cast acrylic – are 2 to 4 hours in an airflow oven at 70 to 80°C. If annealing is not possible, we recommend the use of ACRIFIX®106 or ACRIFIX®107 (only for commercial use). These presuppose that the surfaces to be bonded are flat and without V grooves or superimposed layers.
Roughening-up with abrasive paper (grit 230 to 320) improves the adhesion to untreated surfaces of cast acrylic. Severely stressed bonds or those intended for outdoor exposure should be annealed for 2 to 4 hours at 70 to 80C immediately after curing. ACRIFIX® 192 must not get into closed cavities (e.g. double glazing, tube interiors), since the curing process is severely hampered at such sites, and there is a risk of stress cracking in the bonded parts.
Properties of Bonds
Further treatment of bonded parts: 2 to 6 hours after curing, sanding and polishing after 24 hours.
Tensile shear strength (v = 5 mm/min):
|Material (to itself; cured with illuminant 25)||non-annealed||annealed|
|PLEXlGLAS® GS 233:||28 ± 5 MPa||48 ± 5 MPa|
|PLEXlGLAS® XT 20070:||32 ± MPa||50 ± 5 MPa|
Material (to itself; non-annealed annealed cured with illuminant 25 )
PLEXlGLAS® GS 233: 28±5 MPa 48±5 MPa
PLEXlGLAS® XT 20070: 32±MPa 50±5 MPa
Fix the parts to be bonded in the desired position (avoid shading) and apply suitable adhesive tape to the joint and to protect surrounding areas (see drawings). Introduce ACRIFIX® 192 into the joint either directly from the tube or by means of a glue dispenser or disposable syringe, avoiding bubble formation. Then expose the joined parts to a suitable light source (see Curing). For this, "ordinary" fluorescent lamps of illuminant type 25 are to be preferred, since they provide optimal curing of ACRIFIX® 192 and require no special protective measures against UV radiation at the workplace.
Appearance: Clear, almost colorless; surface may be slightly yellowish.
Limitation of Liability
ACRIFIX® adhesives and other auxiliary agents were developed exclusively for use with PLEXIGLAS® products and are specially adjusted to the properties of these materials. Any recommendations and guidelines for workshop practice therefore refer exclusively to these products. Claims for damages, especially under product liability laws, are ruled out if made in connection with the use of products from other manufacturers. For further information on safety measures, the exclusion of health risks when handling adhesives and on their disposal, see our Safety Data Sheet. Availability according to the current sales range. Our technical advice on the applications of our products is given without obligation. The buyer is responsible for their use and processing, and is also liable for observing any third-party rights. Technical data concerning our products are typical values. Subject to alteration. ® = registered trademark PLEXIGLAS and ACRIFIX are registered trademarks of Röhm GmbH & Co. KG, Darmstadt, Germany.
|Available in 140gr tubes|
UV CURING TECHNOLOGY
Why UV Curing?
One part adhesives that cure using ultraviolet light provide an extremely convenient method of curing on demand, unlike two part adhesives that need to be mixed and used within a certain time frame. Not only is this more convenient for the user, it also eliminates many potential sources of process variability.
What is UV Light?
Ultraviolet light is a particular portion of the light spectrum, typically considered to be in the wavelength range from 200 nm (nanometers) to 400 nm. The most significant property of UV light is its intensity. The intensity of light, which can be measured by a radiometer, is designated by milli-watts per square centimeter (mW/cm²) or Watts per square centimeter (w/cm2). The key to UV curing is matching the wavelength range of the spectrum to a photo-initiator in an adhesive.
Every high performance adhesive has at least two components to it. An obvious example is the two-part, room temperature curing material already mentioned. A less obvious example would be contact cement, where only a single material is handled. For this kind of adhesive to work, a solvent must evaporate from the product, leaving the actual bonding resin behind. So, the resin is one part and the solvent is the second part.
In an ultraviolet-curing adhesive, there are also two components. One part is the adhesive itself and the second part is the photo-initiator which will not react with the resin by itself. The photo-initiator must absorb the ultraviolet light before curing takes place. When the UV light is delivered, the photo-initiator will undergo a chemical reaction and cause the adhesive to harden.
Why Use UV Adhesives?
- No two part mixing required
- Cure on demand
- Environmentally friendly
- Faster, stronger cures
- Minimizes adhesive shrinkage
- Decreases moisture absorption
- Increases humidity resistance
- Decreases out gassing
- Reduces defects while increasing yield
- Reduces cost
While "black lights" do produce light in the UV range, their spectrum is confined to the long-wave UVA region.
UV hand held devices supplied by ATA Pty Ltd are selected to provide UVA light at 365 nm required for our adhesives cure process.
UVA is considered the safest of the three spectra of UV light.
It is the higher energy (short-wave) light in the UVB and UVC range that is responsible for the DNA damage that leads to skin cancer.
UVA light is much lower in energy and does not cause sunburn.
UVA is capable of causing damage to collagen fibers, so it does have the potential to accelerate skin aging and cause wrinkles.
UVA can also destroy vitamin A in the skin.
UVA light can cause DNA damage, but not directly like UVB and UVC.
Due to its longer wavelength, it is absorbed less and reaches deeper skin layers (the leather skin), where it produces reactive chemical intermediates, such as hydroxyl and oxygen radicals, which in turn can damage DNA and result in a high risk of melanoma.
The weak output of black lights, though, should not cause DNA damage or cellular mutations the way sunlight can, although there are reports stating that the type of UV radiation used for suntan (UVA) can cause DNA damage, photo-aging (damage to the skin from chronic exposure to sunlight) and skin cancer as well as toughening of the skin, suppression of the immune system, and cataract formation after overexposure.
Acrylic Technologies Australia Pty is nevertheless proposing compulsory use of protective equipment when working with UV light we supply:
Protective clothing - preventing prolonged skin exposure
Protective UV glasses - preventing prolonged eye exposure
Protective shoes - preventing electrical shocks if working with 240V equipment