Open Time
What is Open Time?
Open time is the time period after applying an adhesive during which it remains processable and parts can be brought together. This time is crucial for process planning and determines the available window for positioning and adjustment.
Properties of Open Time
- Processable time window after adhesive application
- Stable viscosity during open time
- Temperature and humidity-dependent duration
- Sufficient initial strength after joining
- Difference to contact time for contact adhesives
- Product-specific time windows from minutes to hours
Influencing Factors
- Temperature: Higher temperatures reduce open time
- Humidity: Relevant for moisture curing systems
- Bonding Surface: Absorbency of substrate
- Layer thickness: Thicker layers extend open time
- Catalysts: Accelerate the setting process
Application-Specific Requirements
- Active Alignment: Sufficient time for precision adjustment
- Camera Module Adhesive: Controlled time window for alignment
- Dual Cartridges: Defined open time after mixing begins
- Manual assembly: Sufficient time for handling
Open Time vs. Pot Life
- Open time: Time after application until joining
- Pot life: Processing time of mixed 2K systems
- Shelf life: Durability of unprocessed adhesive
- Flash-off time: Waiting time for solvent evaporation
Process Optimization
- Climate control for reproducible open times
- Dispensing Valves: Time-controlled application
- Cooling systems to extend open time
- Microdispensing: Minimal quantities for short processing times
Common Problems
- Too short open time: Incomplete positioning
- Exceeding open time: Loss of bondability
- Uneven curing: Varying connection quality
- Environmental influences: Fluctuating process conditions
DELO Adhesive Solutions
- Adhesives with defined and reproducible open times
- 1-Component Systems with long open time
- Technical consulting for process-optimal time windows
Looking for adhesives with specific open times?
