Name: DINP Plasticizer for Sealants
Brand: Coatingsink
SKU: dinp-plasticizer-sealant
Availability: InStock

Question 1

What are the key regulatory advantages of DINP over DEHP in sealant formulations?

Accepted Answer

DEHP is classified as a Substance of Very High Concern (SVHC) under REACH Annex XIV and requires authorisation for most professional uses. DINP is not listed as SVHC and remains freely usable under REACH, making it the standard general-purpose replacement. Technically, DINP delivers comparable plasticizing efficiency to DEHP, slightly lower volatility due to higher molecular weight, and equivalent cold-temperature performance.

Question 2

Can DINP be used as a plasticiser in polyurethane and polysulfide sealants?

Accepted Answer

Yes. In one- and two-component polyurethane sealants, DINP acts as a non-reactive extender-plasticizer at 5–20% by weight, reducing application viscosity without interfering with the isocyanate–hydroxyl cure chemistry. In polysulfide sealants it serves a similar viscosity-reduction role. Because DINP carries no reactive groups, it is physically retained in the cured matrix and contributes to long-term flexibility.

Question 3

How does DINP affect the low-temperature flexibility of PVC sealants?

Accepted Answer

DINP lowers the glass transition temperature (Tg) of the PVC matrix approximately in proportion to loading level. At 50 phr, a typical flexible PVC compound achieves a brittle point of around −30°C to −35°C. For applications demanding flexibility below −40°C (e.g. façade glazing in cold climates), co-plasticisation with a secondary adipate ester such as DIDA is recommended to push the brittle point further down without sacrificing permanence.

Purity	≥99.5%
Acid Value	≤0.05 mg KOH/g
Flash Point	>200°C
Density (25°C)	0.970–0.975 g/ml
Viscosity (25°C)	70–85 mPa·s

DINP Plasticizer for Sealants

Specifications

FAQ

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