Preparation

 If working from drums or pails open thecontainer, cut open the welded plastic bag and

 attach it to the outer edge of the vesselwith tape. Remove the cover foil.

All one-component adhesives cure withatmospheric moisture. These products may not be exposed to air for more than 5minutes.

 Before installing the drum or pail into thepump equipment, cured material under the follower plate have to be removedthoroughly.

 If working from cartridges or unipacks,follow the instructions given by the gun manufacturer.

 Application

 The products are applied by equipment witha metering pump, or manually directly from the cartridge or unipack.

 The adhesive must be applied evenly andfree from air bubbles. These one-component product

 form a skin after a certain time (skintime), which varies according to humidity and temperature.

 For further details refer to the actualProduct Data Sheets. Tooling and smoothing of joints should

 be carried out as soon as possible afterthe adhesive application and not later than half of the skin time indicated inthe actual Product Data Sheet. It must be ensured that the joint is completely filled and that the joint dimensions correspond to the calculatedvalues.

 Detergent or soap and water are not allowedfor tooling.

 Masking of Areas Adjacent to the Joints

 To assure neat bond lines and protect areasadjacent to the structural joint, use a masking tape.

 The tape must not touch the pre-treatedsurface areas to which the silicone has to adhere. The tape should be removedimmediately after tooling. Do not wait longer than 5 minutes or joints might bedamaged.

 Movement of Bonded Elements

 Bonded units should not be exposed tostress until certain strength has developed. Since adhesion and strengthbuild-up depend on the adhesive used, environmental conditions and thesubstrates, respectively, only general recommendations regarding the time canbe given. If the situation is ambiguous temporary mechanical supports,retaining devices.Spacer Tape HD should be used to prevent loads acting on thejoint during storage, transportation and installation. For more informationplease contact the Technical Service Department of Kanghong company.

 The structurally glazed units must not bemoved to the job site until the adhesive has fully cured and it can bedemonstrated through quality control testing that the adhesive has achievedfull adhesion.

 Transportation of elements is possibleearlier than stated in the table above if tensile adhesion tests on H-specimens(see chapter 6 “Quality Assurance”) kept under the same conditions as the bonded elements give a valueof 0.7 N/mm² and the failure mode is ≥95% cohesive.

 Depending on the factory conditions andorganization of the production process, different times for movement of bondedelements can be agreed upon. This requires an audit of the customer’s production.

 2-component products

Testing the Mixing Ratio (2-componentproducts only)

 The easiest way to check the mixing rationis by weight.

 - In normal mixing and metering systems,the two components can be fed separately via special valves.

 - The balance should be as accurate as 0.1g.Pump both components simultaneously. To achieve maximum accuracy, extrude atleast 0.5 litre of component A.

 - Weigh the components and calculate themixing ratio.

 - For the correct mixing ratio refer to thecorresponding Product Data Sheet.

 Important note

 If the ratio by weight is outside the ±10% range stop work! Adjust the mixture to the required ratio beforecontinuing. In the event of problems with setting the mixing ratio, pleasecontact the equipment manufacturer. Another good way of checking the mixingratio is to compare the pot life (snap time) of the machine-mixed material withthe pot life of a mixture weighed by hand in an exact ratio as stated in thecorresponding Product Data Sheet.

 Marble Test for Homogeneity (2-componentproducts only)

 Take a second glass pane and press it ontothe pane with the adhesive, taking care to exclude air bubbles.

 Important:

 If you see white or deep-black strips, orpronounced light-gray marbling, the adhesive is not properly mixed or an insufficient amount of material was discharged after the last shutdown.Never use such material for bonding. To eliminate the defect, follow theequipment manufacturer’s instructions.If a static mixer is in use, it may have to be replaced.

Picture 1: Positive test = ideal mixing

Picture 2: Negative test = inadequatemixing

Butterfly Test for Homogeneity (2-component products only)

The butterfly test is an alternative to the marble test.

- Fold a sheet of paper down the center andopen it again.

Fold the paper again and press it togetherthat the silicone adhesive spreads out. Hint: a cartridge can be used to rollover the paper.

- Unfold the paper. The silicone adhesivemust have a homogeneous color.

 Important note

 If you see white or deep-black strips, orpronounced light-gray marbling, the adhesive is not properly mixed or an insufficient amount of material was discharged after the last shutdown.Never use such material for bonding. To eliminate the defect, follow theequipment manufacturer’s instructions.

 If a static mixer is in use, it has to becleaned or replaced. After an adequate curing time, double

 check the mixing quality by cutting openthe thicker center section of the adhesive and checking it for streaks andmarbling.

Picture 3: Positive test = ideal mixing

Picture 4: Negative test = inadequate mixin

 Pot Life (Snap Time) Testing(2-component products only)

 - Extrude 10 to 20 ml freshly mixedsilicone adhesive (purge mixer sufficiently) from the machine into a small plastic cup (for example madeof polyethylene).

 - Stir it briefly and vigorously with a wooden spatula, and then remove the spatula.

 - Repeat this operation every 5 minutes

 The pot life or snap time is the time fromextrusion of the silicone adhesive until the point at which it no longer formslong strings when the spatula is removed, but breaks off in short lengths.

 - The measured value should not deviate bymore than 25% from the pot life indicated in the certificate of analysissupplied with each batch of product.

 Skin Time and Tack-free Time(1-component products only)

 - With one-part silicone adhesives, checkthe skin-over time and tack-free time as follows:

 - Using a spatula, apply about 30 g of theadhesive to paper or film in athickness of about 3 to 4 mm.

 - Test every three minutes whether theadhesive surface has changed by probing with a clean finger tip.

 - The skin-over time is the point at whichthe adhesive no longer sticks to the finger. Tack-free time is the point at which the surface feels dry (nolonger tacky).

 The skin-over time given in the ProductData Sheets was determined under standard climatic conditions (23 °C, 50 % relative humidity). Higher temperature and higher humidityreduce the skin over time and tack-free time. If there are drastic deviations (morethan ±50%) from the valuesgiven in the acceptance test certificate, discontinue bonding and consult theTechnical Service Department.