SikaMelt®-176
High performance polyolefin hot melt with medium open time
SikaMelt®-176 is a multipurpose, thermoplastic hot melt for assembly and lamination applications. Due to its medium open time SikaMelt®-176 can also be used for processing within its open time.
- Medium open time
- Good adhesion on polypropylene without surface treatment
- High initial strength
- Good strength and flexibility over a wide temperature range
- Suitable for assembly and lamination
PRODUCT BENEFITS
- Medium open time
- Good adhesion on polypropylene without surface treatment
- High initial strength
- Good strength and flexibility over a wide temperature range
- Suitable for assembly and lamination
Areas of Application
SikaMelt®-176 has very good adhesion properties on non polar olefinic substrates like polypropylene. Therefore it is suitable for permanent bonding on non-polar polymers, wood, textiles, non-woven materials and foams.SikaMelt®-176 is suitable for the assembly of Automotive interior trim mainly for add-on parts on headliner carrier. Futhermore SikaMelt®-176 can be used for the lamination of decorative material within the open time.
This product is suitable for experienced professional users only. Tests with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.
Product Details
| Chemical base | Polyolefin | |
| Color (CQP001-1) | Beige – brown | |
| Cure mechanism | Physical hardening | |
| Density (uncured) | 0.92 kg/l | |
| Viscosity (by Brookfield) | at 180 °C | 9 000 mPa·s |
| Softening temperature (CQP538-5) | 154 °C | |
| Application temperature |
short term max. 1h | 160 – 190 °C 200 °C A |
| Open time (CQP559-1) | Medium | |
| Shore A hardness (CQP023-1 / ISO 48-4) | 70 | |
| Tensile strength (CQP036-3) | 1.3 MPa | |
| Shelf life | 24 months |
| CQP = Corporate Quality Procedure | A) only valid for nozzle |
CURE MECHANISM
SikaMelt®-176 is a physically hardening adhesive.
CHEMICAL RESISTANCE
SikaMelt®-176 is resistant to aqueous surfactant, weak alkaline/ acids solutions and temporarily resistant to fuels, solvents and mineral oils.
The chemical resistance is influenced by several factors such as chemical composition, concentration, period of exposure and tem-perature. Therefore a project related testing in case of chemical or thermal exposure is required.
Application
Surface preparation
Surfaces must be clean, dry and free from grease, oil and dust.
Application
With adequate processing equipment SikaMelt®-176 can be applied as film, dot, bead or spray application. When dispensing SikaMelt®-176 from drums, for applications by slot die or spraying device, first transfer the material to an intermediate tank avoiding air entrapments.
For automated applications a suitable filter system is required.
To meet the required application properties the adhesive viscosity can be adjusted by adapting the application temperature (see diagram 1).
Diagram 1: Viscosity as function of temperature
During breaks SikaMelt®-176 is to be processed as follows:
For breaks ≥ 1 h the heating needs to be lowered to 80 °C and for breaks ≥ 4 h the heating needs to be switched off.
To ensure a constant quality during the whole production process it is mandatory to protect the adhesive in the melting tank with nitrogen or carbon dioxide (to avoid possible reaction of the product with oxygen).
For advice on selecting and setting up suitable processing equipment contact the System Engineering Department of Sika Industry.
Removal
Equipment and application tools can be cleaned with SikaMelt®-005 (see also Cleaning Instructions).
SikaMelt®-176 may be removed from tools and equipment with Sika® Remover-208 or another suitable solvent.
Hands and exposed skin have to be washed immediately using Sika® Cleaner-350H or a suitable industrial hand cleaner and water.
Do not use solvents on skin.
STORAGE CONDITIONS
SikaMelt®-176 has to be stored at temperature below 40 °C in a dry place.
For transportation purposes, the storage temperature can be exceeded for a period of max. 4 weeks up to 60 °C.