Is PETS the same as a generic pentaerythritol stearate or pentaerythritol tristearate?

No. PETS normally refers to pentaerythritol tetrastearate, CAS 115-83-3. A generic pentaerythritol stearate or a tristearate can have a different ester composition, hydroxyl value and melting behaviour. The abbreviation on a label is not enough to establish equivalence; the offered composition and test data must be compared.

Why must physical form and melting behaviour be specified for PETS?

PETS may be supplied as powder, flake or another waxy solid form. Particle form and melting or dropping behaviour can affect feeding, dispersion and processing response. These properties should be agreed with the polymer system and processing equipment rather than inferred from the CAS number or the PETS abbreviation.

Which trial observations determine whether a PETS grade fits a polymer process?

Evaluate the offered grade in the actual compound and processing route. Compare feed consistency, melt flow or torque, release, plate-out, surface appearance and the required finished-part properties against the approved reference. Acceptance should combine the agreed analytical limits with the relevant processing and finished-product results.

Pentaerythritol Tetrastearate (PETS) CAS 115-83-3

Pentaerythritol tetrastearate (PETS) (CAS 115-83-3) is a lubricant and mold-release additive for polymer and rubber processing. The ester specification and physical form are matched to your resin, feeding system and processing conditions. Send your polymer or application, quantity and destination for a quotation; an existing specification can help identify the appropriate grade.

CAS: 115-83-3
Synonyms: Pentaerythritol Tetrastearate; Pentaerythrityl Tetrastearate; PETS; Stearic Acid Pentaerythritol Tetraester
Einecs: 204-110-1
Molecular Formula: C77H148O8 for the ideal tetrastearate component; commercial PETS grades can also contain other C16–C18 fatty-acid esters.
Grade: We specify acid value, saponification or ester value, hydroxyl value, melting or dropping behaviour, colour and physical form, with the applicable test methods.
Package: We quote the packaging and net weight for the selected PETS form, order quantity and destination.

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Product Description

1 Product Overview

2 Product Information / Specifications

3 Storage, Safety and Documentation

Product Overview

PETS is a waxy polyol ester used for internal or external lubrication and mold release in thermoplastics, engineering plastics and rubber compounds. Commercial grades can include C16–C18 fatty-acid esters with different melting behaviour and residual hydroxyl content. Acid value indicates residual free acidity; hydroxyl value helps distinguish esterification profiles. Ester value and saponification value are different: ester value is the saponification value minus the acid value when determined on the same basis. These indices are reported in mg KOH/g and are not themselves purity percentages. We compare the specified limits and test methods alongside physical form and melting or dropping behaviour to help select a PETS grade for your process.

Product Information / Specifications

Product	Pentaerythritol Tetrastearate (PETS) CAS 115-83-3
CAS No.	115-83-3
EC No.	204-110-1
Molecular Formula / Identity	C77H148O8 for the ideal tetrastearate component; commercial PETS grades can also contain other C16–C18 fatty-acid esters.
Synonyms	Pentaerythritol tetrastearate, Pentaerythrityl tetrastearate, PETS, Stearic acid pentaerythritol tetraester
Grade / Supply Specification	We specify acid value, saponification or ester value, hydroxyl value, melting or dropping behaviour, colour and physical form, with the applicable test methods.
Packaging	We quote the packaging and net weight for the selected PETS form, order quantity and destination.

For lubricant selection, compare PETS with ethylene bis stearamide (EBS), an amide wax, and calcium stearate, a metal soap. Their chemistry and melting behaviour differ. Selection or combination depends on the resin, processing temperature and balance of lubrication and release; they are not automatic one-for-one substitutes.

Storage, Safety and Documentation

We can provide a Certificate of Analysis (COA), Technical Data Sheet (TDS) and Safety Data Sheet (SDS) for the quoted PETS grade. These documents support specification comparison, receiving inspection and safe handling. Our TDS and SDS describe the storage conditions for the supplied form, including protection from heat, moisture and contamination. For powder or flake grades, particle form and handling conditions also matter for consistent feeding and dispersion.

FAQ - Technical & Supply Chain

Q:
Is PETS the same as a generic pentaerythritol stearate or pentaerythritol tristearate?

A: No. PETS normally refers to pentaerythritol tetrastearate, CAS 115-83-3. A generic pentaerythritol stearate or a tristearate can have a different ester composition, hydroxyl value and melting behaviour. The abbreviation on a label is not enough to establish equivalence; the offered composition and test data must be compared.
Q:
Why must physical form and melting behaviour be specified for PETS?

A: PETS may be supplied as powder, flake or another waxy solid form. Particle form and melting or dropping behaviour can affect feeding, dispersion and processing response. These properties should be agreed with the polymer system and processing equipment rather than inferred from the CAS number or the PETS abbreviation.
Q:
Which trial observations determine whether a PETS grade fits a polymer process?

A: Evaluate the offered grade in the actual compound and processing route. Compare feed consistency, melt flow or torque, release, plate-out, surface appearance and the required finished-part properties against the approved reference. Acceptance should combine the agreed analytical limits with the relevant processing and finished-product results.

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