What is POM?
Polyacetal (POM) resin is a highly crystalline resin with excellent fatigue resistance. It is a material used in a wide range of products, notable for its low coefficient of friction and self-lubricating properties, making it particularly outstanding in friction resistance.
POM is suitable for long-term use in products because it possesses fatigue resistance, allowing it to withstand damage from repeated long-term operations. On the other hand, with an oxidation index of 15, it is a highly flammable material among plastics (flammable = prone to carbonization due to thermal degradation during molding). Many sites report issues with black dot defects in POM.
Black Dot Defect Issue in POM (Polyacetal)
As a solution case, we will introduce an example utilizing purge agent ecomaru.
[Case Study]
- The following week after producing POM, there was a particularly high rate of foreign matter defects, which was a significant concern.
- Despite various attempts with different purging compounds, significant results were not achieved.
お客様評価
エコマルを使い始めたところ異物不良が5%から0.2％まで減少し、歩留まりを改善できたため、非常に満足している。
Customer Evaluation
After starting to use ecomaru, the foreign matter defect rate decreased from 5% to 0.2%, improving the yield, which has led to a high level of satisfaction.
| Before | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Purging Compound Name | Usage Amount | Double Wash: Yes/No | If Double Wash
Purging Compound Name | Black Dot Defect Rate | |||||
| Company A | 3-5% | ||||||||
| After | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Purging Compound Name | Usage Amount | Double Wash: Yes/No | If Double Wash
Purging Compound Name | Black Dot Defect Rate | |||||
| ecomaruGWS | 0.20% | ||||||||
POM (Polyacetal) Characteristics
Advantages
- Excellent mechanical strength
- Good wear resistance and sliding properties
- Good dimensional stability
- Low water absorption
- Excellent solvent resistance
- Excellent electrical properties
- Relatively high continuous use temperature
Weaknesses
- Poor weather resistance
- Poor adhesion (No suitable adhesive for POM)
- Susceptible to strong acids
- Flammable
- No transparent products
Manufacturer
| Manufacturer | Product name | |
|---|---|---|
| Asahi Kasei Chemicals Corporation | Tenac | |
| Intertech Corporation | ECOTAL | |
| DuPont Co., Ltd. | Delrin | |
| Toray International, Inc. | Kocetal | |
| BASF Japan Ltd. | Ultraform | |
| Polyplastics Co., Ltd. | DURACON | |
| Mitsubishi Engineering-Plastics Corporation | Iupital | |
Main applications
Often used as a substitute for metal parts.
[Sliding properties, wear resistance, fatigue resistance, high strength]
Gears, bearings, bushings, cams, switches, pulleys, etc.
[High mechanical strength]
Door handles, piping fitting parts, etc.
[Solvent resistance]
Oil tank parts, aerosol valves, etc.
[Others]
Various parts of general machinery, fasteners, building materials such as door rollers, etc.
Measures against foreign matter and black dot defects with purging compounds.
