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Standard ≥95% / High-Purity ≥98%
Royalchem
| Product Name | Pentaerythritol Tetra(3-mercaptopropionate) (PETMP) (Synonyms: PETMP; Pentaerythritol tetrakis(3-mercaptopropionate); Pentaerythritol tetra(β-thiopropionate); tetrafunctional thiol) |
| CAS NO. | 7575-23-7 |
| Formula & Weight | C17H28O8S4 (MW: 488.66) | EINECS: 231-472-8 |
| Chemical Structure |  |
| Technical Specifications |
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| Physical Properties |
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| Why Use PETMP? | A game-changer for UV/LED-curing formulations:
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| Packaging & Storage | Packaging: 25 kg / 200 kg drum, or customized. Storage: Keep sealed (N₂ blanket recommended) and protected from light in a cool, dry place, away from oxidizers and ignition sources; thiols oxidize on prolonged air exposure. Shelf life: 12 months. Transport: Stable liquid at ambient temperature; classification per current SDS. |
Royalchem's PETMP (≥ 95% / ≥ 98% high-purity) is the proven additive to overcome oxygen inhibition in UV/LED coatings — for an instant, tack-free surface. We support bulk drum and ISO Tank shipments (CIF/FOB) worldwide.
Contact us for the latest COA, SDS and competitive bulk pricing.
| Thiol-ene UV/LED Curing | The primary application. As a tetrafunctional thiol, PETMP undergoes thiol-ene "click" reaction with acrylates/enes to build high crosslink density, suppress oxygen inhibition, and improve through-cure, adhesion and flexibility in UV/LED coatings, inks and adhesives. |
| Epoxy Curing Agent | Used as a polythiol low-temperature / fast curing agent for epoxy systems, enabling rapid cure even near room temperature — ideal for structural adhesives and electronic potting. |
| High-Refractive-Index Optics | Acts as a high-refractive-index crosslinker in isocyanate (thiourethane) systems, raising transparency and refractive index for optical resins and lenses. |
| Modifier & Organic Synthesis | Functions as an adhesion promoter and flexibility modifier in free-radical systems, and as a building block for functional polymers and organic synthesis. |
| Test Item | Specification |
| Appearance | Colorless to pale-yellow transparent liquid |
| Assay, % | ≥ 95.0 (Std) / ≥ 98.0 (HP) |
| Color (APHA / Pt-Co) | ≤ 20 |
| Acid Value, mg KOH/g | ≤ 1.0 |
| Thiol (-SH) Content, % | 25.7 – 27.0 |
| Refractive Index (20℃) | 1.530 – 1.535 |
| Volatiles, % | ≤ 0.3 |
Typical values; a batch-specific COA accompanies every shipment.
| Packaging | 25 kg / 200 kg drum; customized packaging available. N₂ blanket recommended. |
| Storage | Keep sealed and protected from light in a cool, dry, ventilated place, away from oxidizers and ignition sources. Shelf life 12 months (sealed). |
| Trade Terms | FOB / CIF / CFR. Ports: Shanghai, Nanjing, Ningbo. Lead time: 1–2 weeks (stock items). |
| Transport | Stable liquid at ambient temperature; ship sealed and protected from light. Dangerous-goods classification per current SDS / carrier. |
| What is PETMP and what purity do you supply? | PETMP (Pentaerythritol Tetra(3-mercaptopropionate), CAS 7575-23-7) is a tetrafunctional thiol crosslinker. Royalchem supplies ≥ 95% (standard) and ≥ 98% (high-purity) grades, with a batch-specific COA on every shipment. |
| How does PETMP reduce oxygen inhibition? | In the thiol-ene mechanism, thiyl radicals re-initiate chains that oxygen would otherwise quench, so the surface cures tack-free without nitrogen inerting — especially useful for LED-UV and thick/shadowed parts. |
| What are the main applications? | Thiol-ene UV/LED coatings, inks and adhesives; epoxy low-temperature curing agent; high-refractive-index optical resins; adhesion promoter / flexibility modifier. |
| How should PETMP be stored? | Thiols oxidize in air — keep sealed (N₂ blanket recommended) and protected from light in a cool, dry place, away from oxidizers. Shelf life is 12 months under sealed conditions. |
| Can you provide COA, SDS and regulatory documents? | Yes. Every shipment includes a batch-specific COA. SDS/MSDS is available in multiple languages, with REACH (EU) and TSCA (US) compliance support. Samples available before purchase. |
