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Cure system

Hardeners & Accelerators for Polyester Cure

Room-temperature polyester cure is a redox pair, not a single additive. A cobalt salt decomposes the peroxide catalyst at ambient temperature to generate radicals, and styrene then crosslinks the polyester into a rigid network. Samrat Poly Resins supplies both halves: MEKP as the catalyst and cobalt octoate as the accelerator.

These two are not alternatives to each other. A resin that is already pre-accelerated needs only the peroxide; one that is not needs both, added separately and in the right order.

2Published
Products

2 products

Cure-system products

Hardeners

MEKP Hardener

Catalyst / initiator for published polyester resin systems.

Purity
98%
Price on RequestTDSSDS
Hardeners

Cobalt Octoate

Cobalt-based accelerator / promoter for compatible unsaturated polyester resin curing systems.

Price on RequestTDS

Choosing between them

Catalyst and accelerator do different jobs

Catalyst / initiator

MEKP Hardener

Methyl ethyl ketone peroxide. It is the radical source, used at a low percentage and not consumed stoichiometrically, so adding more does not give a harder cure — it gives a faster, hotter one, with the defects that follow.

View MEKP Hardener

Accelerator / promoter

Cobalt Octoate

The cobalt salt that lets MEKP decompose at room temperature at all. Without it a cobalt-dependent system will not cure at ambient. Many resins arrive pre-accelerated, in which case this is already in the drum.

View Cobalt Octoate

The one rule that matters more than any other on this page: never bring MEKP and cobalt accelerator into direct contact. Mixed together undiluted they can react violently. The accelerator goes into the resin first and is stirred in, then the peroxide goes in separately. Peroxides also lose activity in storage and have real temperature limits, so check the age of stock before blaming a resin for a slow cure. Dosage belongs to the resin grade and the shop temperature, so confirm it against the grade's own data sheet rather than carrying a figure across.

Guides

Read before you specify

MEKP Hardener: Catalyst Role, Systems and Procurement GuideWhat MEKP Hardener is, its published catalyst / initiator role in polyester, vinyl ester and gelcoat systems, and the published packaging, MOQ and shelf-life facts to check before requesting a quote.Cobalt Octoate: Accelerator Role, Chemistry and Handling GuideWhat cobalt octoate is, how accelerator, catalyst and initiator differ, the redox chemistry behind room-temperature polyester cure, how dosage relates to gel time, and why it is never stored with peroxide.Understanding Gel Time in Polyester ResinGel time is the working window between catalysing a polyester resin and it starting to set. What it means, what changes it, and what to check when it drifts.How Temperature Affects Polyester Resin CureWhy ambient workshop temperature is one of the biggest variables in gel time and cure speed, and how fabricators plan around seasonal swings.Troubleshooting Polyester Resin Cure SpeedWhat to check when a batch is gelling faster or slower than expected — working through accelerator dosage, catalyst dosage, temperature and batch size.Common FRP Curing Problems and What Causes ThemA broader look at cure-related defects in FRP work — beyond gel-time timing — including tackiness, incomplete cure and inconsistent batches.

Ordering hardeners: questions buyers ask

Choose the grade, send the quantity and delivery location, and we reply with a quotation. Call +91 74638 81652, message us on WhatsApp +91 74638 81005 or email info@samratpolyresins.in.

2 published grades: MEKP Hardener and Cobalt Octoate. Each is manufactured at Doraha, Ludhiana, Punjab.

MEKP Hardener: 25 kg carboy. For Cobalt Octoate, packaging is confirmed with the quotation.

Prices are quoted on request, for your grade, monthly quantity and delivery location. Send those details on WhatsApp (+91 74638 81005), call +91 74638 81652 or email info@samratpolyresins.in. How ordering works.

Yes. MEKP Hardener and Cobalt Octoate each link a technical data sheet (PDF) with the published specification.

Yes. Supply covers Punjab, Haryana, Delhi, Uttar Pradesh, West Bengal, Bihar, Jharkhand, Odisha, Assam and Andhra Pradesh, with exports to Nepal, Bangladesh, Ethiopia, Cameroon and South Africa.

Traders and distributors can send a dealer enquiry with their firm, location and expected monthly volume on the dealer and distributor enquiries page.

Enquiry

Request a quote for hardeners

Tell us the finished product, the service condition and the quantity, and the right grade can be matched to it. Samrat Poly Resins manufactures at Doraha, Punjab.

How should we reply? (phone or email, at least one)
We only use these to answer this enquiry.

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