Knowde Enhanced TDS
Identification & Functionality
- Polymer Name
- Plastics & Elastomers Functions
- Technologies
- Product Families
Features & Benefits
- Materials Features
- Key Characteristics
Silane crosslinkable polyethylene for high temperature pressure pipes
Applications & Uses
- Applications
- Cure Method
- Plastics & Elastomers End Uses
- Plastics & Elastomers Processing Methods
Properties
- Appearance
- Pellets
- Mechanical Properties
- Physical Properties
| Value | Units | Test Method / Conditions | |
| Elongation at Break | 540 | % | IEC 60811-501 |
| Hot Set (40N/cm² / 200°C / Elongation) (Cure Assessment) | 60 | % | IEC 60811-2-1 |
| Gel Content | 70 | % | ASTM D2765-11 |
| Tensile Strength (at Break) | 24 | N/mm² | IEC 60811-501 |
| Value | Units | Test Method / Conditions | |
| Density | 0.952 | g/cm³ | BS EN ISO 1183-3 |
| Melt Flow Rate (at 190°C / 2.16kg) | 1 | g/10min | Internal Method |
Technical Details & Test Data
- Processing
Pressure Testing – Pipe produced from SX720:CM488 has been shown to satisfy the internal pressure requirements of DIN 16892, BS 7291 Class S, NSF 14 and other international specifications.
Potable Water Approval – Pipe produced from SX720:CM488 has been approved as suitable for use in contact with potable water up to 85°C and have been listed by the Water Regulatory Advisory Scheme (WRAS), DVGW and NSF 61.
Extruder Screw - The use of a high compression polyethylene type screw of 20-25 L: D ratio and compression ratio 2.5:1 to 3:1 is recommended.
Extruder Temperature Conditions – As a guide the following temperature profile is recommended:Zone #1 Zone #2 Zone #3 Zone #4 Head Die Celsius 140°C 175°C 185°C 195°C 205°C 210°C Fahrenheit 284°F 347°F 365°F 383°F 401°F 410°F Screw Water Temperature – Approximately 60°C
Recommended Screen Pack – 30, 50, 100 (mesh apertures per linear inch) or 600, 300, 150 micron
Drow Down Ratio - If extrusion conditions require extrudate draw down, this should not exceed a ratio of 2:1.Cross-linking or Cure – If properly processed the material has the capacity of crosslinking under ambient conditions.
Should accelerated cure times be required, then any of the following methods may be employed.
- Immersion in water at 80°C
- Flushing with water at 80°C
- Exposure to steam at 90°C (as in a sauna)
Catalyst or Color Masterbatches - CM488 catalyst masterbatch is normally added at 5% to 95% of SX720 graft.
Addition of approved color masterbatches, including black, up to a maximum of 1%, has no detrimental effect on the properties or crosslinking capability.
It is recommended that all masterbatches, including those containing the catalyst, should be thoroughly dried at 60°C for 8 hours or at 80°C for 4 hours.
Packaging & Availability
- Packaging
The following possibilities are available:
- Moisture resistant sacks containing 25kg
- Boxes with a moisture resistant heat sealed liner containing approximately 500kg
Storage & Handling
- Storage & Shelf Life
SX720 normally has shelf life of at least 6 months from the date of manufacture. The storage of silane cross-linkable compounds in cool dry conditions will minimize useful shelf life. Other precautions are:
- Packaging should remain sealed
- Avoid temperatures above 25°C
- Avoid storage outside and in direct sunlight
- Use within 8 hours of opening packaging