Real Classification Boundaries of 3 Categories of Hazardous Waste HW12 / HW13 / HW16 at Packaging Printing Plants: Fine Data on Co-Mixing Waste Ink, Waste Developer, and Waste Resin Plates

Last year, a mid-sized printing plant in Jiangsu was issued an 84,000 RMB fine by the local Ecology and Environment Bureau. The reason was not exceeding the hazardous waste volume limit, but pouring HW12 dye and coating waste (waste ink) and HW13 waste organic solvents (waste developer) into the same plastic drum. When inspectors reviewed the records, they found this Q("mixed drum") had been in use for 11 months.

The owner told me verbatim: Q("They're all liquids, can't we just pour them together?")—No, you can't. HW12 and HW13 are two completely different codes under the National Hazardous Waste Catalogue (2021 Edition), corresponding to different disposal methods, different container requirements, and different transfer channels. Co-mixing equals Q("failure to store hazardous waste by category"), which is punishable under Article 115 of the Solid Waste Law.

I. Definitions and Boundaries of the 3 Categories of Hazardous Waste

First, let's clarify what the 3 categories of hazardous waste are. 90% of the hazardous waste generated by packaging printing plants on a daily basis falls under these 3 codes:

HW12 Dye and Coating Waste

In plain language, this is waste ink. It includes: waste ink generated during printing, waste ink cans, waste solvents from cleaning ink fountains, and waste UV ink residue from UV curing. Waste code 900-252-12 (waste generated when using pigments, inks, organic dyes, coatings, and hot melt agents).

The hazardous characteristic of HW12 is T Toxicity—many inks contain heavy metals (lead, cadmium, chromium, mercury) and organic volatile compounds that are toxic to human health and the environment. It must not be poured directly into sewers or mixed with household waste.

HW13 Waste Organic Solvents

This includes: waste developer, waste fixer, waste wash water (gasoline/kerosene mixtures used for washing blankets on offset presses). Waste code 900-451-13 (organic solvent waste generated from cleaning).

The hazardous characteristics of HW13 are T Toxicity + I Ignitability—many solvents have a flash point <21℃, classifying them as 『Class A Fire Hazard Materials』. The HW13 temporary storage room must comply with the Class A workshop standards of GB 50016-2014, requiring fire doors + explosion-proof electrical equipment + anti-static grounding. Many printing plants place the wash water drums in the corner of the workshop—this practice is a fatal compliance violation.

HW16 Photosensitive Material Waste

This includes: waste resin plates, waste PS plates, waste CTP plates, waste film (traditional plate-making films). Waste code 900-019-16 (waste generated when using film bases and photosensitive films).

The hazardous characteristic of HW16 is T Toxicity—resin plate coatings contain hydroquinone, phenolic compounds, and photosensitive resins, while waste film contains silver (a precious metal hazardous waste). HW16 has the highest disposal cost, with waste film disposal fees around 8,000-12,000 RMB/ton (due to the complex silver recovery process).

II. Compliance Boundaries for Co-Mixing the 3 Categories

The most common pitfall for printing plant owners is not that they don't know about the 3 categories of hazardous waste, but that they know but cut corners by mixing them together. The table below shows the compliance boundaries for the 3 categories of hazardous waste:

Key compliance point: The 3 categories of hazardous waste must be stored separately. Co-mixing in the same container or same storage area constitutes Q("failure to store by category"), with fines of 50,000-100,000 RMB (Article 115 of the Solid Waste Law).

III. 3 Typical Compliance Failure Cases

Case 1: HW12 and HW13 Co-Mixing

A printing plant in Zhejiang poured waste ink (HW12) and waste wash water (HW13) into the same 200L plastic drum in the workshop corner, with a Q("Waste Liquid") label on the drum. Identified as Q("mixed storage") during a random inspection by the Ecology and Environment Bureau, fined 84,000 RMB.

Case 2: HW16 Outdoor Stacking

A printing plant in Guangdong stacked waste resin plates (HW16) directly in an outdoor area outside the workshop. After being soaked by rain, heavy metal-containing wastewater was generated. Fined 62,000 RMB after being reported and ordered to transfer within 24 hours.

Case 3: No Explosion-Proof Electrical in HW13 Storage Room

The waste developer (HW13) storage room of a printing plant in Jiangsu used ordinary fluorescent lamps instead of explosion-proof lighting. Identified as a Class A fire hazard by the fire department during a random inspection, fined 30,000 RMB and ordered to suspend production for rectification.

IV. Operating Checklist for the 3 Categories at Printing Plants

What printing plant owners need to do is not to study the original text of the Solid Waste Law, but to lock down the 3 categories of operations within the workshop:

1. 3 Independent Containers: Prepare 3 different colored drums in the workshop (red = HW12 ink, yellow = HW13 solvent, blue = HW16 photosensitive material). Label each drum with the code and keep the lid closed at all times.
2. 3 Independent Storage Areas: Divide the hazardous waste room into 3 zones with floor markings + signage + double locks. The HW13 zone also requires anti-static grounding.
3. 3 Independent Ledgers: Separate ledgers for HW12/HW13/HW16 (as required by Article 78 of the Solid Waste Law), recording daily generation volume, transfer volume, and remaining volume. Mixed records or omissions will be identified as Q("management out of control").

V. Real Disposal Costs for the 3 Categories

What printing plant owners care most about is disposal cost. Disposal unit prices for the 3 categories of hazardous waste (2024 data from Jiangsu/Zhejiang):

• HW12 Waste Ink: 2,800-4,500 RMB/ton
• HW13 Waste Solvents: 3,500-6,000 RMB/ton (including distillation recovery disposal fees)
• HW16 Waste Resin Plates / Waste Film: 5,000-12,000 RMB/ton (silver-containing film is expensive)

For a mid-sized printing plant with an annual output of 10 million printed sheets, the combined cost of the 3 categories of hazardous waste is approximately 15,000-30,000 RMB/year. This money cannot be saved—the fines and production suspension losses from cutting corners are 5-10 times this amount.

VI. 3-Sentence Summary for Printing Plant Owners

1. The 3 categories of hazardous waste require 3 drums, 3 zones, and 3 ledgers—this is the minimum compliance action
2. HW13 (solvents) is the most dangerous—it is flammable, so storage room requirements are the strictest
3. Disposal cost is not a burden, it's insurance—spending 20,000 RMB on compliance avoids 100,000 RMB in fines and production suspension

Practical recommendation: Printing plant owners should make the container distinction for the 3 categories of hazardous waste 『foolproof』—a red 200L drum for HW12 (labeled 『Waste Ink』), a yellow 200L drum for HW13 (labeled 『Waste Solvent』 + 『Flammable』 warning), and a blue turnover box for HW16 (labeled 『Waste Plates』). Place the 3 drums at fixed positions in the workshop, and all employees can remember after just one training session.

Further Reading

• 3 Categories of Monitoring Indicators for Wastewater Discharge from Packaging Printing Plants
• 3 Hard Indicators for VOC Treatment in Packaging Printing
• 5 Years Since the New Solid Waste Law, Packaging Printing Plants Are Still Running Naked
• Real Missing Records in 3 Categories of Hazardous Waste Management at Packaging Printing Plants