Bonding Acetal Plastics (Delrin®* and Celcon®**)
Acetal plastics are noted for their stiffness and high strength properties. They are resistant to wear/abrasion, impact, fatigue and gasoline/solvents. Additionally, they offer dimensional stability, low moisture absorption, electrical insulation and machinability.
Acetal plastics are widely used in the appliance, transportation, electronic, electrical and medical industries. Specific applications include:
- Automotive switches
- Metered-dose inhalers
- Farm machinery
- Relay components
- Fuel filters
Master Bond formulates epoxy adhesives for bonding Delrin® (acetal plastics) to Delrin® and Delrin® to dissimilar substrates.
Consideration for Adhesive Bonding of Acetal Plastics - Chemical Resistance
Prominent adhesive systems used for bonding acetal plastics are EP42HT-2, EP30M4LV and EP30-2. Prior to bonding, chemical etching to acetal surfaces is necessary to optimize bond strength capability. Master Bond EP42HT-2 offers serviceability up to 450°F and resistance to steam, acids, alkalis and many solvents. Two component, room temperature curing EP30M4LV is noted for its ability to withstand exposure to skydrol, 70% sulfuric acid, 98% sulfuric acid, 50% sodium hydroxide and bleach. This low viscosity compound has excellent flow properties and superior electrical insulation properties. NASA low outgassing approved EP30-2 exhibits superior optical clarity. Cryogenically serviceable down to 4K, EP30-2 resists a wide array of chemicals and has excellent bond strength.
**Manufactured by Hoechst Celanese
Acetal plastic manufacturers include DuPont Performance Polymers (Delrin®), BASF Corporation (Ultraform®), Formosa Plastics Corp. (Formocon®) and Hoechst Celanese (Celcon®).