FAQ

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?

When humidity is low, drying is accelerated. When it is high, drying is slower.
 

8. What does viscosity mean?

Viscosity is an informal measure of the thickness of the adhesive: the higher the viscosity, the thicker the adhesive. Spray adhesives have low viscosity to allow proper atomization by the spray gun. Brush adhesives have a higher viscosity to provide easy spreading and prevent soaking-in porous core materials.

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?

D/DSM-94, D/SPL SPR GEN (D), D/SP-202, D/SP-101, etc.

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?

D/PC-65, D/Supreme, D/GP, D/PC-65(M) etc. for solvent borne SR based contact adhesive and D/White for water based PVA adhesive.

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?

It is used for bonding different footwear substrates like leather, synthetic upper, PVC sole, TPR sole, EVA, Phylon, air blown PU sole etc.

22. What are the toluene free grades are available?

In SR Adhesive: Dendrite PC Export TF, Dendrite FW(M).
In PU Adhesive: Dendrite OR-5000(M).

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

Immediately wash with plenty of water and remove to fresh air. Seek medical attention.

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?

A) TPR Primer: It contains two pack, Component – I & Component – II. These two components are mixed just before application. TPR primer is used for activation of TPR sole, NR sole etc. It is used 30mins before adhesive application.

B) Phylon Primer: This is one component solution and used for Phylon / EVA sole.

C) EVA Primer: This is also one component solution and used for priming EVA sole.

D) EVA PP Primer: This is one component solution and used for printing purpose on EVA surface.

E) Synthetic Upper Cleaner: D/M-888 is recommended to use as Synthetic upper cleaner to remove the lacquer / plasticizer on surface for better bonding.

F) Phylon Sole Cleaner: D/SC-69 is used as phylon sole cleaner before application of phylon primer.

G) PU-PVC Sole Cleaner: This is recommended to use for cleaning PU-PVC sole for better bonding.

H) Adhesive Cleaner: This is used to remove the excess adhesive from the edge of bonding.

I) D/OP-202: This is used for Oil pull-up leather where oils and fats contents of leather are quite high. This primer efficiently works against de-lamination of adhesive.

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 ?

Mixing ratio of Yamapoxy components is 1: 1 by volume and 1: 0.8 by weight.

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?

It is used for bangle industries, marble setting, hardwear application, glass fixing, electronics application, automobile etc.

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?

This is Ethyl Cyanoacrylate based very fast setting adhesive. It sets with in 3 – 50sec depending on substrates.

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?

This adhesive is used for bonding almost all types of common substrates like steel, aluminium, rubber, PVC, wood, ply, sunmica, ceramics, fabric, leather, paper, etc.

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

In case of skin contact, immediately soak the area with warm water / nail polish remover and slowly peel. If it gets into eyes or mouth, then wash with plenty of water. Get prompt medical attention.

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?

It can be used for plucking leakage, filling dents, insulations and many more application.

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.