Diisodecyl Phthalate (DPHP) is a high-molecular-weight, branched general-purpose phthalate plasticizer recognized worldwide for its excellent balance of performance, durability, and cost-effectiveness. It offers superior permanence, very low volatility, outstanding fogging resistance, and exceptional weathering performance, making it the preferred replacement for DOP/DEHP in most high-durability flexible PVC applications.

 

Technical Specifications

ITEMS SPECIFICATIONS
Appearance Transparent oily liquid
Content ≥99.6%
Color (APHA) ≤40
Acid Value, mgKOH/g ≤0.05
Refractive Index(25) 1.484+0.005
Moisture ≤0.05%
Volume Resistivity, Ω•cm 1.2*10^11
Heating Reduction ≤0.10%

 

Packaging and Storage

  • Net weight 200kg steel drum.
  • Store in cool place. Keep container tightly closed in a dry and well-ventilated place.

 

Key Advantages of Diisodecyl Phthalate (DPHP)

  • Extremely low volatility and migration → ideal for long-life applications
  • Outstanding resistance to extraction by water, oils, and detergents
  • Excellent UV and heat aging stability (suitable for 90–105°C cable grades)
  • Very low fogging → preferred in automotive interiors
  • Superior electrical insulation properties
  • Lower plastisol viscosity than DINP at equal hardness
  • Cost-effective replacement for higher-priced high-molecular-weight plasticizers

 

Primary Applications of Diisodecyl Phthalate (DPHP)

  • Automotive interior and under-the-hood PVC parts (instrument panels, door panels, cables)
  • High-temperature wire & cable insulation (90°C, 105°C rated)
  • Roofing membranes and tarpaulins
  • Artificial leather and coated fabrics
  • Flooring and wall coverings
  • Food-contact films and hoses (EU 10/2011 & FDA approved grades)
  • Children’s toys and childcare articles
  • Printing inks and adhesives

 

Frequently Asked Questions (FAQs)

What is the difference between DIDP and DINP?
DIDP has a higher molecular weight and longer, more branched alkyl chain than DINP, resulting in lower volatility, better permanence, lower fogging, and superior high-temperature performance. DIDP is preferred in automotive and 105°C cable applications.

Can DIDP be used in food-contact applications?
Yes. High-purity DIDP grades comply with EU 10/2011 (PIM) and FDA 21 CFR 178.3740 for indirect food contact.

Is DIDP allowed in children’s toys?
Yes. DIDP is explicitly permitted in toys and childcare articles in the EU (≤ 0.1% with DINP/DNOP) and meets EN 71-3 migration limits worldwide.

What is the typical dosage of DIDP in flexible PVC?
30–70 phr depending on desired hardness and performance. Commonly used alone or blended with fast-fusers for plastisols.

How does DIDP perform in automotive fogging tests?
DIDP shows excellent results (typically >90% reflectance in DIN 75201 Method B), making it one of the top choices for car interiors.

 

Where can I buy high-quality Diisodecyl Phthalate (DPHP)?

You can contact us via email [email protected] for offers and bulk orders.