1. What is SR based contact Adhesive?

Adhesives which are applied to two substrates, dried and mated under only enough pressure to result in good contact. The bond is immediate and sufficiently strong to hold pieces together with out further clamping, pressing or airing. Contact adhesives are almost a universal general purpose adhesive, widely used for bonding different shoe components like leather, microsole, rexine, banwar, EVA etc, metal to foam / rexine in automobiles; ply, sunmica, foam, rexine, coir foam etc. in furnishing application and many others.

2. How SR based contact adhesive is applied?

Contact adhesive is applied by brush, notched trowel, air spray (hot or cold), airless spray (hot or cold), curtain coater.

3. How much adhesive should be applied?

Enough adhesive is applied to coat the surface uniformly and thick enough that, when completely solvent-free, a tacky, somewhat resilient uniform thin film is left i.e. coating deposition should be an optimum balance, not high or not low.

4. How soon should bonding be done?

This may be done as soon as solvent is completely gone. If you can press a finger to the surface and pull away cleanly and with no sign of “legginess”, the surface is dry. If there is any doubt at all, give it a few extra minutes. If any puddling has occurred, be sure the puddles are dry. After dryness has been reached, you have an extra few minutes to make the bond. This is called “open time”.

5. How is drying accomplished?

Drying is accomplished by ordinary air exposure, use of fans, passage under infra-red bulbs, or passage through a heated tunnel. It all depends on the production speed desired.

6. Does temperature affect the drying time of SR based contact adhesives?

Drying takes place more slowly at lower temperatures and is faster at higher temperatures.

7. Does humidity affect the drying time of SR based contact adhesives?

8. What does viscosity mean?

9. How to measure the bonding strength of adhesives?

The basic two parameters i.e. peel strength and shear strength are usually are used to measure the bonding strength. Both peel strength and shear strength could be measured by using tensile testing machine.

10. Is there a common solvent that can be used to thin SR based contact adhesives?

Various solvents used in contact adhesives are usually special blends designed to give certain applications properties. To avoid potential problems of changing the drying time and spray ability or brush ability, use only the manufacturer’s recommended thinner.

11. What are the prime causes of bond failure?

• Not to select suitable grade of adhesive depending on substrates to be bonded.

• Coating too thin (not enough glue)

• Bonding too soon

• Not enough pressure

• Exposure to high heat within 3 days

12. What is the application procedure of contact adhesive?

Make sure that the surfaces to be bonded are even, clean, dry and free from grease/oil. A coat of adhesive is to be applied uniformly on both the surfaces to be joined. Porous substrates like leather may require two coats for superior bonding. Wait for 8 – 10 minutes to allow the solvent to evaporate. Place the coated surfaces one above the other while the adhesive remains sticky. Press the surfaces firmly together. Final strength is to be achieved after 24 hrs.

13. Which grades of SR based contact adhesive are used in footwear application?

D/Supreme, D/FW (L), D/FW (Tan), D/EXP, D/PC Export, F/PC 80AFW, D/PC 65, D/SR-1010 Etc.

14. Which grades of SR based contact adhesive are used in automobiles application?

15. Which grades of SR based contact adhesive are used in foam-furnishing application?

D/FF-555, D/PC-99M, F/PC 80A Furnishing, D/PC-69D, D/Premium 2006 etc.

16. Which grades of contact adhesive are used in furniture application?

17. What are the application areas of Dendrite Tube?

This adhesive is designed for domestic as well as industrial application. It is widely used in electronics, watch, automobile, handicrafts, interior decoration & small repairing job at home.

18. What is Polyurethane adhesive?

Adhesives based on Polyurethane as a base polymer is called polyurethane adhesive. During application it is usually used along with hardener.

19. What are the PU grades adhesives are available?

Gen PU 201, Sona PU 100, Super Sona PU 99, D/OR-1000K, D/OR-1000FW, D/OR-1005, D/OR-1009, D/OR-3009, D/OR-1000, D/OR-3000(M), D/OR-5000, D/OR-5000(M), D/OR-6500, D/OR-6500(M) etc.

20. What is the application procedure of Polyurethane adhesive?

It is mandatory to use the Dendrite Polyurethane adhesive mixed with cross linking agent like Yamadur H – 20 / Yamadur R – 22 @ of 5% by weight in order to attain better durability of bonded surfaces & resistance to higher service temperature. The bonding surfaces should be free from dust, oil and grease and if required, suitable primer should be used depending upon nature of the substrates. This primer should be dried before application of adhesive. A thin layer of hardener mixed adhesive is to be applied on the surfaces to be bonded. Allow 15 to 20min for solvent evaporation. If required a second coat of adhesive may be applied after drying of the first coat. Allow another 15 to 20min for solvent evaporation. Tack – free adhesive films on both substrates are to be heat activated at around 55 – 70°C for 45 – 60 sec depending upon nature of substrates and then pressed together with adequate uniform pressure. Final peel strength will be achieved after 24 hours.

21. What are the application areas of Polyurethane adhesive?

22. What are the toluene free grades are available?

23. What should we do when adhesive comes contact to our body or inhale vapour?

24. What is primer?

Primers are basically adhesion promoter. It is used to activate the surface for better bonding.

25. What are the application areas of different types of primers and cleaners?

26. What is Yamapoxy adhesive?

This is two components adhesive wherein component – I is based on epoxy resin and Component – II is based on reactive polyamide.

27. What is the mixing ratio of yamapoxy components ?

28. What is the application procedure of Epoxy adhesive?

Make sure that the surfaces to be bonded are clean, dry and free from grease/oil. Take equal volume from each component, i.e. from resin part and hardener part, as per the requirement and mix thoroughly both the components. After mixing, it should be applied within 40 to 50minutes (at 30°C). The pot life of the above mix is around 60min. However, final strength is achieved after 24 hrs.

29. What are the application areas of Epoxy adhesive?

30. What is Dendrite Yamapoxy Quick & Clear adhesive?

This is two components fast setting clear epoxy based adhesive. It is available in the tube.

31. What is setting time of Dendrite Yamapoxy Quick & Clear adhesive?

Setting time of Dendrite Yamapoxy Quick & Clear adhesive is 4 – 5min.

32. What are the application areas of Dendrite Yamapoxy Quick & Clear adhesive?

It is used for bangle industries, marble setting, hardwear application, glass fixing, electronics application, automobile, jewellary where clarity and fast settings are required etc.

33. What is Dendrite Super Quick adhesive?

34. What is the application procedure of Dendrite Super Quick adhesive?

The substrates to be bonded should be clean, dry and free from oil and grease. A thin layer of the adhesive is to be applied on one of the substrates to be bonded. Immediately place other substrate on it and press together with adequate uniform pressure until handling strength is achieved.

35. What are the application areas of Dendrite Super Quick adhesive?

36. How to handle if D/Super Quick adhesive is adhered with skin?

37. What is Denseal?

It is two component putty based on Epoxy & Polyamide resin. Resin part is off-white and hardener part is black dough type material.
 

38. What is the mixing ratio of denseal components?

Mixing ratio of denseal components is 1: 1.

39. What are the application areas of Denseal?

40. What are the basic features of Denseal?

1] Solventless
2] Very easy to mix
3] Fast setting, Harden within 45min.
4] Excellent dimensional stability
5] Negligible shrinkage
6] Water resistant
7] Excellent machine-ability and drilling-ability.
8] Good gap filling ability.