RESOURCES
How to Stay One Step Ahead: Affordable and Accessible Tests for Impact Modifier Quality in PVC Production
In the realm of impact modifiers, understanding their influence on strength is crucial. We can differentiate between two typical types of impact modifiers:
– core-shell modifiers like e.g. acrylic impact modifiers (AIM)
– Impact modifiers which form a network structure like CPE
With various types of impact modifiers available in the market, it’s essential to discern their quality and types. Characterising and evaluating these modifiers demand expertise, specific equipment, and techniques not universally accessible. Many PVC converters focus on the final product’s quality, oversee the raw materials. Baumann is absolutely convinced that comprehending raw materials and their characterisation can significantly minimize waste, leading to reduced costs of quality control and a higher sustainability level.
To assess the quality of impact modifiers, follow these straightforward methods:
- Determine the basis of frequent impact modifier:
- Flame Test: Place a spatula of the impact modifier on a flame. Observe the tip of spatula, color and odor.
| Basis | Behavior after removal of flame source | Odor | Color of flame | Drips |
| ACRYLICS | Burning continues | Fruity | Blue, yellow tip | No |
| CPE | Burns, but extinguish | Pungent, Irritating | Blue, green tip | No |
- Check the quality:
- Count Dark Resins: Assess the number of visible contaminations (mainly dark particles) in 50 grams of CPE. These defects can impact the final product’s surface quality.
- Heat Stability: For applications sensitive to heat stability, formulate a CPE paste by incorporating a plasticizer and heat it on a hot plate indirectly. Observe color changes and compare with a reference sample. It’s a comparison test similar to ASTM D2115, ensuring the new sample’s heat stability matches the previous cargo.
- Density and bulk density: According to GB/T 1636-2008. Considering the method and licenses employed, different suppliers may produce with a varying bulk density. The important factor is ensuring consistent results across all batches.
Baumann rigorously tests each impact modifier batch for specific properties, including influence on gelation behavior and rheology during extrusion. This meticulous approach guarantees quality assurance. Final processes undergo testing, aligning with our commitment to delivering quality akin to our customers. Let’s connect to address your exclusive concerns.