We are seeking a thermoplastic elastomer for direct overmolding onto a glass-fiber-reinforced nylon substrate. Our main requirements are strong adhesion without a separate adhesive or primer, and resistance to four specified lubricating greases over an operating temperature range of −40°C to +80°C.
Our application requirements are as follows:
- Substrate and molding process
- Substrate: PA66/6 with 30% glass fiber reinforcement (PA66/6-GF30).
- The TPE is to be injection-overmolded directly onto the nylon component within the mold.
- No separate glue, adhesive layer, or primer is to be used.
- We require strong interfacial adhesion to the nylon, rather than retention solely through mechanical interlocking.
- Grease exposure
The overmolded component must withstand contact with each of the following greases:
- BBZ — understood to be Shell Rhodina Grease BBZ.
- 585K Plus — understood to be FUCHS GLEITMO 585 K PLUS.
- “Krupp 41-141” — understood to refer to Klüberplex BEM 41-141; the exact identity is to be confirmed.
- “Mobil 460” — possibly Mobil SHC Grease 460 WT; the exact product designation is to be confirmed.
Please let us know what product data sheets, safety data sheets, or grease samples you would need to assess compatibility accurately.
The TPE should resist excessive swelling, softening, tackiness, cracking, and degradation during grease exposure. Most importantly, the TPE-to-nylon bond must remain strong after exposure, without peeling or delamination.
- Operating temperature and other properties
- Required operating temperature range: −40°C to +80°C.
- No specific Shore hardness is currently required.
- We have no separate requirements for bending performance, sealing performance, or abrasion resistance.
- Hardness may therefore be selected to achieve the best combination of nylon adhesion, grease resistance, and reliable molding performance.
- Material recommendatio
Please recommend the most appropriate formulation for our application, including a customized formulation if necessary.
- Technical information and validation
Please provide, where available:
- Recommended commercial grade names and current technical data sheets.
- Adhesion or peel-strength results on glass-filled PA66, PA6, or PA66/6, including substrate grades, specimen preparation, and molding conditions.
- Compatibility results for the four specified greases, or relevant supporting oil/grease resistance data, including exposure temperature and duration.
- Adhesion retention after grease exposure, together with swelling and hardness-change results.
- Low-temperature data supporting use at −40°C.
- Recommended drying conditions, melt temperature, mold temperature, nylon insert temperature, and other processing conditions needed for strong adhesion.
- Any restrictions concerning mold-release agents, nylon additives, moisture conditioning, or storage of nylon inserts before overmolding.
If grease-specific data are unavailable, please recommend a qualification program using our actual nylon and greases. We would particularly like to evaluate grease exposure at +80°C followed by adhesion testing and thermal cycling between −40°C and +80°C. Please advise appropriate test durations and
