While traditionally Cynoacrylate adhesives are known to be brittle and hard,technological developments at Loxeal has now made it possible for Cynoacrylate adhesives to be flexible and infact very flexible thus making it possible to use them on soft joints and form very soft bondline that till sometime ago was assumed to be impossible. Refer to Flexible Cynoacrylate section for more details.
Glass surface is typically has high Ph value making them highly alkaline in nature.WhenCynoacrylate adhesives are used to bond glass curing can take place at veryrapid pace due to alkalinity present on the surface leading to weak or very brittle bond joints.While initially the bond may seem good, it can come off over a period offew hours or few days.Cynoacrylate adhesives thus are generally not recommended to be used on glass surface.Loxeal 43S,however being a surface insensitive productis an ideal choice among all Cynoacrylate adhesive if they must be used to bond glass for some specific reasons.
Loxeal has formulated a great range of Cynoacrylate adhesives to suit most application requirements.Surface insensitive Cynoacrylate adhesive such as Loxeal 43Sor Gel formulated adhesive Loxeal IS47 are ideal for such applications where a general purpose adhesive do not perform.
Cynoacrylate adhesives are not recommended to be used to bond substrates having large surface area for a variety of reasons.The two most important being, large surfacearea typicall means uncontrolles flatness of the surface or high gaps, Cynoacrylate adhesives do not fill gap more than 0.3mm.Secondly bonding of large surface will require larger application time and Cynoacrylate adhesives are instant curing.
Bonding of a metal substrate using Cynoacrylate adhesive can be a daunting task very often,it does not matter how many varieties you use optimum bonding can bevery challenging.HoweverLoxeal IS-17 or Loxeal IS-14 are two products that work fantastically on metal surfaces.You still need to take care that the surface itself should not be too large in size.
Environmetal temperature plays an important role in curing speed.As a thumb rule every 10° increase in temperature wil result in twice the polymerization/curing speed.That’s why you may observe a Cynoacrylate curing slowly in winter than in Summers.
Most Cynoacrylate adhesives are low in viscosity making them difficult to use on vertical surfaces.HoweverLoxeal IS-47 is especially formulated to be used on porous and vertical surfaces
Due to their fast curing nature most Cynoacrylate adhesives are not suited for such an application that need parts to be adjusted after bonding.However,delayed curing Loxeal CAs such as Loxeal IS-17, Loxeal IS29,Loxeal 60R are well suited for such an application.
With most cynoacrylate adhesives you may observe this whitening effect sometime later after application.This can be particularly problematic in parts that are ofaesthetic importance or are of dark color where whitening (technially known as blooming) occurs. Loxeal’s IS-67, IS-63 and IS-61 are the products formulated to elimiate such problems.These products can be used in enclosed chambers too where blooming is of particular concern.
Since Instant adhesives cure when they come into contact with atmospheric humidity or on substrate,humidity/moisture play a very important role in its curing.Too low a humidity (<40% RH) can cure the product very slowly and too high a humidity (>80% RH) can cause shock polymerization causing shrinking of the product and poor bond strength.An ideal himidity for the use of Instant adhesives is between 40% to 70%
A high Ph indicates (>9) very high alkalinity and high moisture content. A high moisture content surface can cause Cynoacrylate adhesive to cure too rapidly causing shock polymerization and a very weak bond.Correspondingly as very low Ph (<5) indicates an acidic surface where instant adhesives can take too long to dry and form weak bond.
Polyolefins are a type of plastics that are having very low surface energy (<31 dyne/cm) making them very difficult to bond with Cynoacrylate adhesives thathave typical surface energy of >34dyne/cm.Hoever, Loxeal formulation of Primer-7 enables increase in the surface energy of all Polyolefins includingPTFE,Delrin et al and allows for excellent bonding over these surfaces that sometimes exceed the strength of substrate itself.Thus for such applications it is recommended to use Loxeal Primer-7 over the surface prior to bonding with Loxeal Instant adhesive.
Technological advances at Loxeal laboratory now makes impossible possible.Till just a few years back it was believed that high temperature application is not thearea for Instant adhesivs,however with the introduction of products such as Loxeal IS-56, it is now possible to successfully bond surfaces that can be exposed to 200°C
While most Cynoacrylate adhesives can withstand shock and impact load when used on plastic and elastomers, it becomes very challenging when they are used on rigid surfaces such as metals.Loxeal IS-29, IS-74 and IS-77 are rubber toughened Cynoacrylates that are formulated to withstand high impact and shock loads on all types of surfaces