Plasticizers
DIDP (Diisodecyl Phthalate)
CAS 26761-40-0 — High-Temperature PVC Plasticizer
DIDP is the preferred plasticizer for high-temperature PVC applications including 105 °C rated wire and cable, automotive under-hood components, and industrial hose. Texas-Chem supplies industrial-grade DIDP in bulk drums, totes, and tanker.
CAS Number
26761-40-0
Flash Point
Above 210 °C
Heat Rating
105 °C rated
Pack Sizes
Drums · Totes · Tanker
Structure
C₂₈H₄₆O₄ — Diisodecyl Phthalate — CAS 26761-40-0
Safety & Regulatory
- NFPA Health
- 1 — Slight hazard
- NFPA Flammability
- 1 — Slight hazard
- NFPA Reactivity
- 0 — Stable
- Flash Point
- Above 210 °C — Non-flammable
- OSHA PEL
- Not established
- DOT Hazard Class
- Not regulated
Grades & Packaging
Available Grades
Pack Sizes
Also Known As
Physical & Chemical Properties
| CAS Number | 26761-40-0 |
| Molecular Formula | C₂₈H₄₆O₄ |
| Molecular Weight | 446.7 g/mol |
| Appearance | Clear colorless to pale yellow liquid |
| Boiling Point | Above 250 °C |
| Flash Point | Above 210 °C — Non-flammable |
| Density | 0.966 g/cm³ at 20 °C |
| Vapor Pressure | Less than 0.001 mmHg at 20 °C |
| Viscosity | ~130 cP at 20 °C |
| Water Solubility | Practically insoluble |
| Heat Rating | 105 °C wire/cable rated |
| Regulatory Status | REACH compliant — not SVHC |
Industrial Applications
High-Temperature Wire & Cable
DIDP is the preferred plasticizer for 90 °C and 105 °C rated PVC wire and cable insulation, providing superior heat resistance compared to DINP. Used in industrial wiring, appliance wiring, and automotive wiring harnesses.
Automotive Under-Hood
Used in PVC automotive parts in the engine compartment where temperatures exceed 90 °C — wire harnesses, hose, and sealing components.
Industrial Hose & Tubing
Used in PVC industrial hose for hot water, steam, and high-temperature fluid transfer applications where DINP would have insufficient heat resistance.
Electrical Insulation
Used in PVC electrical insulation for industrial motors, transformers, and high-temperature electrical equipment.
Roofing Membranes
DIDP is used in PVC roofing membranes for high-temperature climates where maximum heat resistance is required.
Industrial Gaskets & Seals
Used in PVC gaskets and seals for high-temperature industrial applications.
Why Source DIDP from Texas-Chem
- Industrial-grade DIDP in stock — drums, totes, and tanker
- Consistent quality with CoA on every lot
- Same-week delivery across Texas; nationwide LTL and bulk tanker
- Technical support for high-temperature PVC and wire/cable applications
- One rep from first call to final delivery
DIDP — Frequently Asked Questions
What is the difference between DIDP and DINP?▾
DIDP (diisodecyl phthalate) has a higher molecular weight (446 vs 418 g/mol) and lower volatility than DINP (diisononyl phthalate). DIDP provides superior heat resistance and is rated for 105 °C wire and cable applications, while DINP is rated for 90 °C. DIDP is preferred for high-temperature applications; DINP is preferred for general-purpose applications where cost is a priority.
Is DIDP suitable for automotive under-hood applications?▾
Yes. DIDP is the preferred plasticizer for PVC automotive under-hood components where temperatures can exceed 90 °C. Its very low volatility (vapor pressure less than 0.001 mmHg) minimizes fogging of automotive glass and meets automotive OEM specifications for low-fogging PVC compounds.
What is the typical loading of DIDP in high-temperature wire insulation?▾
DIDP is typically used at 30–50 phr in 105 °C rated PVC wire insulation compounds. The lower loading compared to DINP is possible because DIDP provides better heat resistance per unit of plasticizer. Contact Texas-Chem at 855-TEX-CHEM for formulation guidance.
Can DIDP replace DINP in existing PVC formulations?▾
DIDP can replace DINP in most flexible PVC formulations with minor adjustments. DIDP has higher viscosity and slightly lower plasticizing efficiency than DINP, so the loading may need to be increased by 2–5 phr to achieve the same hardness. DIDP provides better heat resistance and lower volatility than DINP.