Vipel L758-NTI-15 is a high-modulus isophthalic unsaturated polyester resin from AOC for heat-cured pipe rehabilitation. Composites made with Vipel L758-NTI-15 provide a trenchless solution for the fast repair of sewer and drainage pipes by the cured-in-place pipe (CIPP) relining process. The resin offers good water and chemical corrosion resistance, long storage stability at room temperature, and fast cure at elevated temperature.
Key Features
- Filled resin quickly impregnates polyester felt liners
- Helps prevent resin drainage from the liner
- Suitable for both thick-wall and thin-wall liners
- Controllable working time
- Achieves the expected liner dimensions
- High long-term property retention in service
Vipel L758-NTI-15 Technical Data
Product Specification (Typical Values)
| Property | Typical Value | Unit | Test Method |
|---|---|---|---|
| Appearance | Hazy | – | TM 2265 |
| Acid value | 6.6 | mg KOH/g | TM 2401 |
| Solids content (IR drying) | 65 | % | TM 2033 |
| Viscosity (Z2, 250 s⁻¹, 23℃) | 981 | mPa·s | TM 2013 |
| Gel time | 19 | min | TM 2259 |
| Cure time | 25.4 | min | TM 2259 |
| Peak exotherm temperature | 73 | ℃ | TM 2259 |
| Stability at 50℃ (initiated) | 79 | min | TM 2301B |
Liquid Resin Typical Properties
| Property | Value | Unit | Test Method |
|---|---|---|---|
| Flash point | 33 | ℃ | TM 2800 |
| Shelf life (no initiator, dark, 25℃) | 6 | months | – |
Unfilled Casting Typical Properties
| Property | Typical Value | Unit | Test Method |
|---|---|---|---|
| Tensile strength | 50 | MPa | ISO 527-2 |
| Tensile modulus | 4.8 | GPa | ISO 527-2 |
| Elongation at break | 1.9 | % | ISO 527-2 |
| Flexural strength | 80 | MPa | ISO 178 |
| Flexural modulus | 5.4 | GPa | ISO 178 |
| Heat deflection temperature (HDT) | 108 | ℃ | ISO 75 Ae |
| Glass transition temperature (Tg) | 131 | ℃ | – |
Tensile properties follow ISO 527-2 and flexural properties ISO 178. The flexural modulus of 5.4 GPa reflects its high-modulus design.
Applications of Vipel L758-NTI-15 CIPP Resin
The resin is mainly used in the heat-cured relining of existing pipes. Typical projects are municipal sewer and storm-water drainage pipes, where a resin-impregnated felt liner is inverted or pulled into the old pipe and then cured in place with hot water or steam, restoring the pipe without excavation. Its water and chemical resistance supports long service life in wastewater conditions.
For pipe and tank work that needs higher corrosion resistance, compare it with vinyl ester grades such as Atlac 430, or browse our full resin catalog.
Processing Guidelines
- Weigh all raw materials accurately.
- Pre-disperse powdered curing agents in styrene to form a uniform paste.
- Mix the resin and curing agents thoroughly in a mixer.
- Control the temperature throughout mixing.
- During roller impregnation, maintain the vacuum and a suitable impregnation speed.
- In summer or when the workshop is hot, add ice; impregnated liners should be transported refrigerated (-10℃ to 20℃).
- Cure pipes of different diameters following the recommended cure curve.
Use the resin under good working conditions and stir it evenly before use.
Storage
Store Vipel L758-NTI-15 in a dark, dry place at 5℃–30℃. Higher storage temperatures shorten shelf life and may change resin properties, and styrene-containing resins degrade quickly when exposed to light. Keep it only in dark, 100% light-tight containers away from direct sunlight. The TDS and SDS are available on request.
Frequently Asked Questions About Vipel L758-NTI-15
What is Vipel L758-NTI-15 used for?
It is a heat-cured resin for trenchless cured-in-place pipe (CIPP) rehabilitation of sewer and drainage pipes.
What type of resin is it?
A high-modulus isophthalic unsaturated polyester resin, with a typical flexural modulus of 5.4 GPa in unfilled castings.
How is it cured?
It is stable at room temperature and cures quickly when heated. The data sheet lists a 19-minute gel time at 60℃ with the recommended additive package.
What is the shelf life?
6 months without initiator, stored in the dark at 25℃.
Request a Quote for Vipel L758-NTI-15
Send us your pipe diameters, liner wall thickness and project volume at info@chemicalsstore.com, and we will confirm availability and lead time and send the TDS and SDS with your quote.
