Pigment Red 170 Buyer Guide: How to Qualify PR170 for Coatings, Plastics, and Inks

Choosing the right Pigment Red 170 (PR170) grade isn’t just about matching a shade card—it’s about minimizing qualification time, verifying batch consistency, and ensuring your supplier delivers SDS/TDS/COA documentation that meets procurement audit standards. This comprehensive buyer guide covers everything formulators and procurement teams need to evaluate C.I. Pigment Red 170 for industrial coatings, plastics & masterbatch, and printing/packaging inks, with a clear checklist for qualifying a grade such as Pigment Red 170F5RK / HP Red 2131.

1) PR170 Identity Verification: Confirm What You’re Buying First

Before you compare performance, lock down “what exactly are we buying?” This prevents avoidable re-qualification later. If you’re migrating from a branded grade such as Clariant F3RK70, review our PR170 F3RK70 equivalent alternatives before building your test plan.

Confirm these items up front:

• Color Index (CI) name: C.I. Pigment Red 170 (PR170)

• CAS number: 2786-76-7 — confirm via the supplier’s SDS/TDS

• Regulatory documentation set: at minimum, SDS and TDS for the exact grade you’re qualifying

• COA expectations: define what must appear on each batch Certificate of Analysis (COA) (test items, methods, limits, and traceability)

⚠️ Warning: If a supplier can’t provide an SDS/TDS/COA package for the exact grade name you’re ordering, treat that as a qualification risk—especially when you operate change-control or approved vendor lists.

2) Application-Specific Pass/Fail Criteria for PR170

PR170 can be used across multiple applications, but qualification criteria shift depending on resin system, processing temperature, and exposure conditions. Define your “done means done” requirements in your internal test plan.

Coatings (industrial, automotive, powder)

For coatings, teams typically qualify PR170 around three themes: appearance, durability, and process robustness.

• Tinting strength / color development: confirm the shade target and strength relative to your internal standard

• Dispersion behavior: evaluate how quickly you reach a stable grind and whether viscosity rises unexpectedly

• Lightfastness and weathering: align the test condition to your end use (interior vs exterior; UV exposure expectations)

• Solvent and chemical resistance: check resistance against the solvents/chemicals your coating actually sees

• Heat stability: confirm the pigment holds shade and strength through your bake/process window

Plastics and masterbatch

For plastics, PR170 qualification often fails (or passes) on processing heat, migration/bleed, and batch-to-batch stability.

• Heat resistance during processing: confirm the pigment tolerates your real melt temperature and residence time

• Migration / bleed resistance: test against the substrates and additives you actually use (plasticizers, slip agents, contact layers)

• Dispersion in your carrier: check whether you need special dispersants or higher energy input to hit your QC targets

• Color consistency: confirm that batch variation stays inside your ΔE tolerance and does not force frequent formulation correction

Printing and packaging inks

Printing inks add another layer: rheology, solvent exposure, and rub/transfer performance.

• Dispersion and viscosity stability: confirm stable ink viscosity and no unexpected thickening over time

• Solvent resistance: verify resistance relative to your solvent system and end-use contact scenario

• Lightfastness and weathering: define exposure expectations (e.g., outdoor labels vs indoor packaging)

• Low migration / bleed: especially important when inks contact overprint varnishes, laminations, or sensitive substrates

3) PR170 Qualification Workflow: Sample to Production

A clean qualification process reduces risk and keeps procurement and technical teams aligned.

Step 1 — Request a sample package that matches real production

Ask for samples that represent the grade you plan to buy (same treatment, same particle characteristics), plus the documentation set.

Minimum request package:

• A sample of the grade

• TDS (Technical Data Sheet)

• SDS (Safety Data Sheet)

• A COA example (what you will receive with each batch)

Step 2 — Run lab-scale tests aligned to your failure modes

Don’t test “everything.” Test the things that cause scrap, rework, customer complaints, or regulatory friction.

• Define your internal pass/fail criteria (shade, strength, dispersion time, migration/bleed behavior, durability)

• Use your own resin system, processing window, and substrate

• Document your procedure so results are reproducible and auditable

Step 3 — Pilot / scale-up under real processing conditions

Many pigments look fine in lab drawdowns but drift at scale.

• Shade shift after full thermal history

• Dispersion variability run-to-run

• Processing stability (filterability, viscosity, foaming issues where relevant)

Step 4 — Lock change-control rules before you approve the supplier

• COA requirements (tests included, frequency, traceability)

• Definition of “material change” (raw materials, process, site, treatment)

• Notification expectations and re-qualification triggers

4) Red Flags and Deal-Breakers for PR170 Procurement

• No clear documentation trail: SDS/TDS/COA missing, inconsistent, or not grade-specific

• Unclear batch traceability: COA cannot be tied to lot numbers and shipment documents

• Vague fastness claims: performance statements without context (test condition, method, or internal standard)

• Unmanaged variation: frequent shade/strength drift that forces ongoing correction in production

• Logistics uncertainty: unclear packaging, inconsistent lead times, or weak communication during shipping disruptions

Pro Tip: Treat “data turnaround time” as a supplier KPI. Slow response on COA clarifications or test questions is usually a preview of slow response during a real quality event.

5) What to Request from Your PR170 Supplier

For decision-stage evaluation, buyers usually need more than a brochure. Ask for a package that helps you qualify and re-order reliably.

Documentation

• TDS: key properties and recommended applications for the exact grade

• SDS: safety and handling information

• COA: batch-specific results and traceability

Quality & supply information

• Batch identification and traceability approach

• Packaging options and storage recommendations

• Typical lead time and shipping terms

• Support process for technical questions during trials

If you’re evaluating Pigment Red 170F5RK / HP Red 2131, you can start the conversation with Honor Pigments and request the sample + document set above. For a broader view of red pigment options, browse our complete organic pigments catalog.

PR170 Buyer FAQ

Looking for Pigment Red 170? Contact Honor Pigment for technical data sheets (TDS/SDS) and free samples of HP Red 2131. Get in touch →

Disclaimer: This article is for general reference only. Always verify specifications with our team and review the current full legal disclaimer, TDS and SDS before product use.

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