How to Evaluate Graphene Conductive Ink for Product Integration

A graphene conductive ink can look impressive on a datasheet and still fail in the product.

That is one of the most common problems buyers face when evaluating graphene materials.

The real question is not simply whether an ink contains graphene. It is whether it can perform consistently after it becomes part of your product.

This guide uses Far Infrared Graphene Conductive Ink as the canonical product term. We use “graphene conductive ink” throughout as the shorter search and industry alias, but we are evaluating the same material family: graphene-based inks formulated for far-infrared performance and textile integration.

Quick Answer

The best graphene ink is not necessarily the one with the highest graphene content. It is the one that performs consistently in the application you are trying to manufacture.

Judge it the way a product would fail, not the way a datasheet would sell:

• Far-infrared emissivity ≥ 0.88 under GB/T 30127-2013 (≥ 0.83 for loose or fibrous substrates)
• Far-infrared temperature rise ≥ 1.4°C
• Wash-adhesion grade at 5B per ASTM D3359
• Sheet resistance documented in Ω/sq
• Proof that the data describes the material itself, not a finished product or a wired heating element dressed up as far-infrared

From there, the real test is the chain everything must survive: material → printed layer → product → production.

The Problem: A Market With No Shared Standard

Prices for “graphene conductive ink” span from tens to thousands of yuan per unit.

The same phrase can describe an ink for rigid printed circuits, a sensor material, a flexible heater, or a textile coating. Those are different materials with different purposes.

The useful question is not “Does it contain graphene?” It is “What is this ink optimized for, and what measurable evidence supports it?”

The Two Numbers That Actually Matter (GB/T 30127)

China’s far-infrared textile standard — GB/T 30127-2013 — gives buyers a concrete, verifiable baseline. It is a test method, not a marketing slogan, and it does not evaluate medical effects.

Evidence tier: Official standard requirement

Criterion	GB/T 30127-2013 Threshold	Standard Test Conditions	What it tells a buyer
Far-Infrared Emissivity	≥ 0.88 (≥ 0.83 for loose or fibrous substrates)	Tested at 34°C, 5–14 µm wavelength band	How efficiently the material re-emits far-infrared radiation
Far-Infrared Temperature Rise	≥ 1.4°C	Irradiance under standard far-infrared source	Whether the material produces a measurable thermal effect under standard test conditions

If a supplier cannot state how these were measured, the number is not yet a specification. It is an assertion.

Measured Performance on a Printed Test Coupon

Tan Kah Kee Innovation Laboratory (IKKEM) has publicly reported the performance of XIHE’s graphene-printed textile test coupon, tested at the IKKEM materials lab. These are laboratory values from printed test coupons, not finished-product claims.

Evidence tier: Third-party laboratory result

Test Item	GB/T 30127-2013 Threshold	IKKEM Reported Result	Standard Test Conditions	Judgement
Far-Infrared Emissivity	≥ 0.88	0.94	Tested at 34°C, 5–14 µm wavelength band	Compliant
Far-Infrared Radiation Temperature Rise	≥ 1.4°C	2.7°C	Irradiance under standard far-infrared source	Compliant

Source: IKKEM — Graphene-Based Conductive Ink and Its Applications, August 2020. All values obtained from printed test coupons at the IKKEM materials lab.

A lab value shows the material’s potential. A finished-product value shows what a wearer actually experiences.

Durability and Electrical Criteria (Outside GB/T 30127)

GB/T 30127 defines the far-infrared baseline. A buyer also needs to know whether the printed layer will survive manufacturing and use. The following criteria are not part of GB/T 30127-2013; they come from separate test methods and determine whether the ink can become a product.

Evidence tier: XIHE supplier specification, derived from IKKEM characterization and internal validation

Criterion	Typical Test Method	Standard Test Conditions	What it tells a buyer
Wash-Adhesion Grade	5B per ASTM D3359 crosshatch tape test	After 30 ISO 6330 domestic wash cycles on printed textile with protective top-coat lamination	Whether the printed layer survives repeated washing and mechanical stress
Sheet Resistance	documented in Ω/sq	5 Ω/□ to 100 Ω/□ @ 25 µm dry film thickness, formula-tunable	The ink’s electrical behavior, when conductivity is part of the design
Fineness	≤ 10 µm	Particle-size measurement	Whether the ink can be printed without clogging screens or causing surface defects
Solid Content	< 15 wt%	Gravimetric measurement	How much solvent must be removed during curing and how film thickness is controlled
Viscosity	100–8,000 mPa·s	Configurable per printing process	Whether the ink fits the chosen printing method and line speed

Note: 5B is the top adhesion grade under ASTM D3359. GB/T 30127-2013 does not define wash-adhesion grades.

Important: The 30-cycle wash rating applies to a complete printed-plus-over-coated textile test coupon. Bare printed ink without protective encapsulation is not rated for repeated washing.

Who Sets the Standard

The standards conversation does not happen in a product listing. It happens in institutions.

China’s graphene standardization effort is anchored by Tan Kah Kee Innovation Laboratory (IKKEM) — a Fujian provincial innovation laboratory co-sponsored by Xiamen city and Xiamen University, established in 2019. IKKEM incubated XIHE through its graphene engineering program and has publicly reported on XIHE’s graphene conductive ink, its ton-scale pilot production line, and its Anta integration case.

At the product level, XIHE is the lead drafter of China’s Graphene Flexible Electrothermal Heating Film Industry Standard (Plan No. 2024-0923T-YB, Ministry of Industry and Information Technology). That role matters because a supplier who helps write the test method is held to the same definitions it is proposing.

Related reading:

• XIHE and IKKEM Expand Joint-Equity Graphene Thermal Materials Collaboration
• XIHE Named Lead Drafter of China’s Graphene Heating Film Standard

The Distinction That Exposes Most Claims: Passive vs Wired

The single most common way a graphene ink number is inflated is to blur passive far-infrared with wired electric heating.

Wired electric heating converts electricity into heat. It can raise surface temperature by tens of degrees in a minute. But that requires a battery, a controller, and a wiring path. It is an electric heating claim, not a far-infrared material claim.

Passive far-infrared warming works differently. The printed graphene layer absorbs the body’s own heat and re-emits it as far-infrared radiation, with no current and no wiring.

Its performance is judged by emissivity and temperature rise under GB/T 30127. The threshold is 1.4°C, not “15 degrees in 60 seconds.”

When a buyer sees headline temperature numbers, the first question should be:

Is this passive far-infrared, or wired electric heating?

A Proven Benchmark: From Lab Value to Product Value

The difference between a good ink and a datasheet is whether it was ever used in production.

XIHE worked with the Anta Group to develop a graphene print — a version of Far Infrared Graphene Conductive Ink printed directly onto down-jacket fabric.

In standard far-infrared testing, the printed layer recorded a far-infrared radiation temperature rise of 2.7°C and emissivity of 0.94. In finished-garment testing, the same technology produced a maximum fast-warming effect of 2.3°C — the number that appears in the product.

Evidence tier: Finished-product result, reported by government/state media

The Fujian Science and Technology Department and Fujian Daily reported that the graphene-printed down jackets combined ultra-light, ultra-thin construction with the ability to absorb and reflect body far-infrared radiation, supporting microcirculation, with a maximum fast-warming effect of 2.3°C. The same report noted the 2019 winter collection reached a production volume of 560,000 garments.

Read the full case study: How Graphene Heating Technology Was Scaled to 560,000 Heated Garments

Evidence Summary

Claim	Evidence Type	Source
GB/T 30127-2013 thresholds (emissivity ≥ 0.88, temperature rise ≥ 1.4°C)	Official standard requirement	SAMR GB/T 30127-2013
XIHE graphene conductive ink development, 0.94 emissivity, 2.7°C temperature rise	Third-party laboratory result	IKKEM materials lab, August 2020
XIHE-Anta graphene-printed down jacket integration and 560,000-garment production	Finished-product result / government-state-media report	Fujian Science and Technology Department / Fujian Daily, April 2021
2.3°C maximum fast-warming effect in finished garment	Finished-product result / government-state-media report	Fujian Science and Technology Department / Fujian Daily, April 2021
XIHE lead drafter of MIIT standard 2024-0923T-YB	Company / industry record	XIHE public disclosure; MIIT standard-plan public record not available as of August 2026

Where public third-party records are not available, we label the claim accordingly rather than present it as independently verified.

What an OEM Decision Looks Like

Beyond the thresholds, a buyer needs to know whether the ink fits an existing production line. The following decision matrix summarizes the typical integration window for XIHE Far Infrared Graphene Conductive Ink.

Evidence tier: XIHE supplier specification, for OEM discussion

Parameter	Spec / Notes
Substrate compatibility	Validated: PET, PI film; woven cotton, polyester, non-woven textile; metal foil. Silicone-rich soft substrates require pre-treatment.
Printing method	Primary: flat-bed screen printing. Compatible with rotary screen for roll-to-roll textile mass production; viscosity tuned for each process.
Curing window	Solvent-based: 80–120°C, 15–30 min. Water-based: 100–130°C, 20–40 min. Maximum substrate temperature must not exceed the substrate thermal limit (e.g., textile ≤ 120°C).
Sheet resistance range	5 Ω/□ to 100 Ω/□ @ 25 µm dry film, formula-tunable for heating-film design.
Solid content / Viscosity	Solid content < 15 wt%; viscosity 100–8,000 mPa·s, configurable per printing process.
Wash durability	5B adhesion retained after 30 ISO 6330 domestic wash cycles on printed textile with protective top-coat lamination. Without protective top-coating, wash performance degrades sharply; bare printed ink is not rated for repeated washing.
MOQ	1 kg for sample order; 10 kg for production batch.
Sample lead time	5–7 working days for formulated sample shipment; 7–12 working days for bulk production.
Customization path	Formulation tuning for substrate and performance target: engineering sample → pilot run → mass production.

This matrix is a starting point for discussion, not a fixed specification. Contact XIHE to confirm values for your substrate and volume.

Why XIHE

Most graphene suppliers stop at the material. XIHE operates at the integration layer:

• Manufacturing-scale evidence — a ton-scale pilot production line spun out from IKKEM in 2019, with batch-level traceability for OEM production; not lab-bench-only samples.
• Standard-aligned material development — formulas developed against GB/T 30127 / GB/T 30128 textile functional-test framework; finished-coupon third-party test reports available for end-product qualification.
• Process-adaptation engineering — application-engineering support for screen and rotary-screen printing, plus curing-profile tuning for your specific substrate (PET / fabric / sponge composite stack). Not just selling raw ink, but process-parameter guidance for your production line.
• Complete evidence package — lab-origin disclosure, patent list, third-party fabric-sample test reports, and media-reference archive for B2B customer audit.

From Material Specification to Product Integration

A material specification is only the starting point.

In real product development, the harder questions come next:

• Can the ink be printed onto the target substrate?
• Does it maintain performance after curing?
• Does it survive washing and repeated use?
• Can the printing process fit your existing production line?
• And most importantly: has the technology been validated in a finished product at manufacturing scale?

A datasheet answers the first half of those questions. Production answers the rest.

This is where material suppliers and technology integration partners differ. XIHE works with manufacturers to integrate graphene-based far-infrared and electrothermal technologies into existing products — from functional textiles and heated apparel to other product platforms.

The objective is not simply to supply graphene. It is to make graphene work inside the product.

The Checklist: What to Ask Before Buying

On this page, “graphene conductive ink” refers to XIHE’s Far Infrared Graphene Conductive Ink product family.

Before you shortlist a graphene conductive ink supplier, run through these questions:

1. What application is the ink actually designed for? Prevents category confusion between electronics, sensors, heaters, and textiles.
2. What is the documented emissivity, and how was it measured? GB/T 30127 sets the ≥ 0.88 baseline (≥ 0.83 for loose or fibrous substrates), typically measured at 34°C over 5–14 µm.
3. What is the measured temperature rise? ≥ 1.4°C is the passive far-infrared threshold under GB/T 30127 test conditions.
4. What is the wash-adhesion grade? 5B per ASTM D3359 (after 30 ISO 6330 domestic wash cycles on printed test coupons with protective top-coat lamination) signals real-world durability.
5. Is the claim about the ink, the printed layer, or the finished product? Separates material data from product storytelling.
6. Is the temperature claim passive far-infrared or wired heating? Exposes inflated headline numbers.
7. Has the ink been used in a real manufacturing run? Separates bench samples from sourcing-ready materials.

The last question is the one that matters most.

A bench sample proves a material can be made. A real manufacturing run proves it can be integrated, reproduced, and shipped.

Before you contact a supplier: turn these seven questions into a structured audit with our 25-question supplier qualification checklist.

Where This Fits

If you are evaluating graphene conductive ink for a product integration, start with the GB/T 30127 thresholds and the durability/electrical criteria. Then ask whether the supplier can show evidence at every step of the material-to-production chain.

Next steps:

• Request the GB/T 30127 + ASTM D3359 test-report package
• Request a sample print on your substrate — formulated samples ship in 5–7 working days
• Book a 30-minute integration engineering call

Scientific Disclaimer

This page is for material and OEM evaluation only. It does not provide medical advice and does not convert material-level properties into disease-treatment claims. Test data shown here were obtained from printed test coupons (emissivity and temperature rise per GB/T 30127 at 34°C, 5–14 µm; 5B adhesion per ASTM D3359 after 30 ISO 6330 domestic wash cycles on printed test coupons with protective top-coat lamination). Final end-product performance depends on substrate, lamination, adhesives, composite stack, and full finished-goods testing, and must be verified for each application. Statements about microcirculation and fast-warming effects reflect reported product-test and manufacturer description language, and are not presented as therapeutic claims.