Pigment Selection Checklist for B2B Procurement

A structured approach to pigment selection prevents the two most common procurement mistakes: paying for unnecessary performance, or under-specifying and dealing with quality complaints later. This checklist takes you from initial requirement to placed bulk order.

Step 1: Define your application clearly

Document the end-use context:

• End product type: paint (waterborne / solvent-borne / powder), plastic (PVC / HDPE / PP / engineering), printing ink (offset / flexo / gravure / digital), textile, rubber, construction.
• Binder system or polymer carrier (specific resin / polymer grade).
• Maximum processing temperature.
• Indoor vs outdoor use; estimated outdoor sun exposure (years).
• Chemical exposure (acid, alkali, solvents, cleaners).
• Mechanical exposure (abrasion, scratching).

Step 2: Define performance requirements numerically

Convert vague requirements into specific numbers your supplier can match:

• Color target: CIE Lab Lab* values, or Pantone reference, or RAL number.
• ΔE tolerance batch-to-batch: typical premium less than 1.0; standard less than 2.0.
• Lightfastness: Blue Wool minimum (1-8 scale, ISO 105-B02). Indoor 4-5; architectural 6-7; premium 7-8; OEM automotive 8.
• Heat stability: minimum °C in target polymer (rate above your max processing temp + 10-20°C safety margin).
• Chemical resistance ratings: acid, alkali, solvent (1-5 scale, target 4-5 for industrial).
• Particle size target: d50 specification.

Step 3: Identify regulatory requirements

• REACH: required for any product sold into EU.
• Free from 24 banned aromatic amines: required for textiles, leather, toys, food contact in EU.
• RoHS: required for any electronics or electrical equipment in EU.
• FDA / EU 10/2011: required for food contact materials.
• NSF: required for potable water (drinking water pipe) applications in many markets.
• BIS / IS: required for Indian standard mark certifications.
• SASO: required for export to Saudi Arabia.
• Country-specific: Halal certification, Kosher, child-safety standards.

Step 4: Identify candidate pigment chemistry

Match the requirements to candidate pigment families. As a starting point: bright cheap colors (azo); blue/green premium (phthalocyanine); red/violet premium (quinacridone or DPP); high-temp yellows (benzimidazolone or HP yellow). Get supplier recommendations rather than trying to specify the grade yourself if you’re new to the application.

Step 5: Qualify your supplier

• Manufacturing capability: documented quality management minimum; environmental, safety and laboratory systems desirable.
• Documentation maturity: Can they provide COA, SDS, REACH, RoHS, 24-amines-free certificates per shipment?
• Capacity and reliability: Can they hold buffer stock for your required grade? Lead time consistency?
• Geographic match: Direct shipping to your destination? Customs experience?
• Technical support: Do they help with formulation troubleshooting, or just ship boxes?
• Reference customers: Existing customers in similar applications you can reference?

Step 6: Sample testing protocol

1. Request free 50-100g samples of 2-3 candidate grades.
2. Run dispersion test in your binder/polymer system at standard loading.
3. Measure ΔE versus your color target.
4. Test lightfastness (xenon-arc cabinet, 100-200 hours minimum).
5. Test heat stability at your maximum processing temperature plus safety margin.
6. Test chemical resistance per your application (acid, alkali, solvent bleed, plasticizer migration if applicable).
7. Document all data. Pick the grade that meets all requirements at the lowest cost.

Step 7: Place the bulk order with proper specifications

Your purchase order should specify:

• Pigment grade name and CI code.
• Reference batch number from the qualification samples.
• ΔE tolerance versus reference (typically less than 1.0 or less than 2.0).
• Required performance specs (lightfastness, heat stability, etc.) as numerical minimums.
• Required documentation list (COA, SDS, REACH, RoHS, 24-amines-free, country-specific).
• Quantity, packaging, lead time, delivery incoterms.
• Payment terms and currency.
• Reject criteria and return policy.

Step 8: Validate every batch

Even from a qualified supplier, run a quick incoming-QC check on every batch: spectrophotometric ΔE versus reference, particle size check, and visual inspection. Catching a problem at goods-in is much cheaper than catching it after you’ve blended it into a 5000-litre paint batch.

Kanani Pigment & Paste’s supplier qualification is straightforward: 100% REACH and RoHS compliant grades, an in-house quality-control laboratory, full documentation per shipment, free 50-100g samples for any grade, batch-to-batch ΔE less than 1.0 commitment for premium grades, and 30+ countries of established export experience. Contact +91 88499 95971 or [email protected] to start qualification.