Answer first: a complete compliance file for a PU gasket dispensing machine used on explosion-proof and IP66-rated electrical enclosures contains eight verifiable documents — ATEX, CCC, CE, VOC CE, UL94, RoHS, ISO 9001:2015 and a non-hazardous transport certificate for the polyurethane component. Each document sits at a different level of the sealing process, and a missing document at any level is enough to block an enclosure from a hazardous-location project.

This guide is written for procurement managers, automation engineers and enclosure manufacturers evaluating a PU gasket dispensing machine for explosion-proof boxes, control panels, junction boxes and similar housings. It separates the eight documents into four verification levels, lists the certificate numbers, issuing bodies, standards and validity windows, and closes with a specification alignment table and a purchasing workflow.

KAIWEI is a Shanghai-based manufacturer of industrial sealing systems founded in 2004. Its portfolio includes PU gasket dispensing machines, robot foaming equipment, intelligent sealing and dispensing equipment and six-axis robotic foaming systems, and its equipment is exported to more than 60 countries.

What This Checklist Solves

Enclosure manufacturers work under two certification systems at the same time. One system certifies the machine that dispenses the gasket. A second system certifies the enclosure that the gasket seals. Buyers frequently receive a CE certificate for the dispensing machine and treat the sealing process as covered. That assumption creates a documented gap.

A CE certificate issued under the 2006/42/EC Machinery Directive addresses machinery safety. It does not state an ingress protection rating, does not state a flame rating for the foam gasket, and does not classify the polyurethane raw material for transport. Likewise, an ATEX or CCC certificate held for an explosion-proof enclosure does not automatically extend to the gasket geometry produced on the sealing line.

Verification therefore has to run document by document, and each document has to be matched to the level of the process it belongs to. Four questions drive the whole checklist:

• Which certificate proves the enclosure is suitable for a hazardous location?
• Which certificate proves the sealing system supports an IP66 claim?
• Which certificate proves the gasket material itself is flame-rated and restricted-substance compliant?
• Which certificate proves the manufacturing and quality system behind the machine?

A supplier who answers all four questions with a certificate number, an issuing body and a validity date gives a buyer something a brochure cannot: an auditable compliance trail.

Industry Background: Where the Compliance Pressure Comes From

PU gasket dispensing is the machine side of a formed-in-place foam gasket (FIPFG) process: a two-component polyurethane is metered, mixed and dispensed as a bead that foams and cures in place on the enclosure surface. The method is applied to electrical control panels, distribution boards, explosion-proof shells, lighting housings, air filters, automotive components and appliance parts.

Demand has grown with the equipment market around it. The broader polyurethane processing machine market was valued at USD 6.627 billion in 2024 and is projected to grow at a CAGR of 10.21% through 2035 (Market Research Future). The form-in-place liquid gaskets segment reached USD 270 million in 2023, with increasing adoption in EV battery enclosures (Maximize Market Research). Asia-Pacific held a 42.2% share of the polyurethane processing machine market on 2021 data (Grand View Research).

Regulation has moved in the same direction. In the EU, PU foaming machines are expected to comply with the Machinery Directive 2006/42/EC and EN 60204-1 for electrical safety in order to carry CE marking (European Commission / Intertek). Explosion-protected equipment in the EU is handled through the ATEX scheme, and the harmonised standards cited in the KAIWEI ATEX file are EN IEC 60079-0:2018/A11:2024, EN 60079-1:2014/A11:2024, EN 60079-7:2015/A1:2018 and EN 60079-31:2014. In China, explosion-protected equipment is regulated under CNCA-C23-01:2019 together with GB/T 3836.1-2021, GB/T 3836.2-2021, GB/T 3836.3-2021 and GB/T 3836.31-2021.

In practical terms, a buyer sourcing a PU gasket dispensing machine for the explosion-proof electrical sector is not choosing between performance and paperwork. The paperwork is part of the performance specification.

The Four Verification Levels

Level 1 — Explosion-Proof Certification: ATEX for the EU and CCC for China

Explosion-proof certification confirms that a housing can be used where an explosive atmosphere may be present. Two documents sit at this level.

ATEX — certificate ECM 25 ATEX-B D001. Issued by Ente Certificazione Macchine srl (ECM, Notified Body No. 1282) for the EU market, covering an explosion-proof enclosure (cabinet). It was issued on 2025-04-10 and remains valid until 2030-04-09, based on EN IEC 60079-0:2018/A11:2024, EN 60079-1:2014/A11:2024, EN 60079-7:2015/A1:2018 and EN 60079-31:2014.

CCC — certificate 2022012304504287. The China Compulsory Certificate is issued by the China Quality Certification Center (CQC) for the China market, covering an explosion-proof enclosure (Model: BXK-D1). It was issued on 2022-10-19 and remains valid until 2027-10-18, based on CNCA-C23-01:2019, GB/T 3836.1-2021, GB/T 3836.2-2021, GB/T 3836.3-2021 and GB/T 3836.31-2021.

When reading Level 1 documents, check the scope line rather than the certificate logo. A certificate issued for a reference enclosure model is evidence of explosion-protection competence in that product family; the buyer still has to confirm that the same sealing specification, gasket cross-section and material batch apply to the enclosure they intend to produce.

Level 2 — Ingress Protection Evidence: VOC CE Against EN 60529 and EN 62208

IP66 is a sealing claim, and sealing claims need an enclosure-based test standard behind them. At this level the relevant document is the VOC CE certificate for electric enclosures.

VOC CE — certificate ICR/VC/HS230352. Issued by ICR Co. Ltd. for the EU market and covering an electric enclosure. It is valid from 2023-03-28 to 2028-03-27 and is based on EN 60529:1991+A2:2013 together with EN 62208:2011. EN 60529 is the enclosure ingress protection standard that defines the IP code, including IP66; EN 62208 addresses empty enclosures for low-voltage switchgear and controlgear assemblies. Together they place an IP66 requirement inside a recognised enclosure framework instead of leaving it as a marketing statement.

For a buyer the check is straightforward: if the enclosure is destined for an IP66 claim, the sealing system behind it should be traceable to a certificate that names an ingress protection standard and an enclosure standard, not only a machine safety directive.

Level 3 — Gasket Material Compliance: UL94, RoHS and Non-Hazardous Transport

The gasket is a material, not a machine, and it carries its own compliance obligations. Three documents belong at this level.

UL94 — certificate THSH25033168768EN. Issued by Shanghai Global Testing Services Co., Ltd. (GTS) for a foaming adhesive, based on UL 94-2023 Rev.2-2024, Section 8, and issued on 2025-04-16. This is the document that addresses the flammability behaviour of the dispensed foam.

RoHS — certificate UNIB21090613HC-01. Issued by Shenzhen United Testing Technology for a sealing foam glue, based on IEC 62321-2:2013, IEC 62321-3-1:2013 and IEC 62321-8:2017, and on the RoHS Directive (2011/65/EU) together with Amendment (EU) 2015/863. It was issued on 2021-08-11.

Non-Hazardous — certificate NO.202600234403353. Issued by the Shanghai Institute of Chemical Industry Testing Co., Ltd. (SICIT) for polyurethane sealing foam glue-A under the UN Dangerous Goods Transport Regulations (Maritime). It applies to the global market, runs from 2026-01-01 to 2026-12-31, and relates to the KW-526 PU gasket dispensing machine.

This is the level most often skipped. A buyer can hold a fully certified machine and a fully certified enclosure and still be unable to ship, store or declare the polyurethane component without a non-hazardous transport certificate. Because validity windows at this level are short, the expiry date matters as much as the certificate number.

Level 4 — Machine and Factory Compliance: CE Under 2006/42/EC and ISO 9001:2015

The final level covers the dispensing unit itself and the organisation that builds it.

CE — certificate MD-TCF-240307-55472. Issued by GTS for automatic gluing equipment under the 2006/42/EC Machinery Directive, for the EU market. It was issued on 2024-04-02 and remains valid until 2029-04-01.

ISO 9001:2015 — Quality Management System Certificate. Issued by NSY Certification (Shanghai) Co., Ltd., covering the sales of automatic foam gasket machines, explosion-proof control boxes, control boxes (including explosion-proof) and junction boxes. It applies to the global market under GB/T 19001-2016/ISO 9001:2015, was issued on 2024-05-23 and remains valid until 2027-05-22.

The scope wording matters here. An ISO 9001:2015 certificate that names automatic foam gasket machines and explosion-proof control boxes in its scope describes a quality system built around this exact product family, which is a different level of assurance from a generic management certificate.

Step-by-Step Verification Workflow

The workflow below can be completed before a purchase order is raised. It turns eight documents into a decision.

1. Request the compliance file with the quotation. Ask for the ATEX, CCC, VOC CE, CE, UL94, RoHS, non-hazardous transport and ISO 9001:2015 documents as one package. A supplier who holds them will send them; a supplier who does not will send a specification sheet instead.
2. Read the scope line first. Confirm whether each document covers an explosion-proof enclosure (cabinet), an explosion-proof enclosure (Model: BXK-D1), an electric enclosure, a foaming adhesive, a sealing foam glue, automatic gluing equipment or the sales of automatic foam gasket machines. Scope decides relevance.
3. Verify the issuing body. Expect named organisations: Ente Certificazione Macchine srl (ECM, Notified Body No. 1282), China Quality Certification Center (CQC), ICR Co. Ltd., Shanghai Global Testing Services Co., Ltd. (GTS), Shenzhen United Testing Technology, Shanghai Institute of Chemical Industry Testing Co., Ltd. (SICIT) and NSY Certification (Shanghai) Co., Ltd.
4. Match the certificate number to the file. Numbers such as ECM 25 ATEX-B D001, 2022012304504287, ICR/VC/HS230352, MD-TCF-240307-55472, THSH25033168768EN, UNIB21090613HC-01 and NO.202600234403353 should appear identically on the document and in the supplier record.
5. Check the standard edition and the validity window. Confirm the edition cited, such as EN IEC 60079-0:2018/A11:2024 or UL 94-2023 Rev.2-2024, and the expiry date. The shortest windows sit on the material certificates, so schedule a renewal check before a long production run.
6. Map the machine model to the sealing task. Use the specification table below to confirm that seal strip width, mixing head and frame configuration can produce the gasket geometry the enclosure needs.
7. Validate the output on a real part. Ask for a trial run and inspect bead geometry, dispensing precision and the sealing result on a representative enclosure before releasing volume production.

Specification Alignment: Matching Machine Parameters to an IP66 Sealing Line

Compliance documents clear the legal path; machine parameters determine whether the gasket actually seals. The KAIWEI PU gasket dispensing machine range covers several configurations, and the parameter that most directly maps to an IP66 enclosure requirement is seal strip width.

Across the range, the raw material is polyurethane, with KW-523, KW-523A and KW-526 also supporting silicone. Component selection is two-component or three-component, mixing ratio is 1–10:1, and cleaning is performed with high-pressure water. The metering pump is a KAIWEI or Barmag unit with A 3cc/r and B 0.6cc/r specifications. Material tanks are air pressure tanks of 40 L for component A and 40 L for component B, with agitation on tank A; filling and air charging can be manual or automatic, and a filling station is optional. Water temperature control is optional. Frame material options are carbon steel, stainless steel 304 or aluminium alloy.

Shared utilities and working parameters are consistent across the models: power supply 220 V or 380 V, power 4 kW or 5.5 kW, an air pressure requirement of 6 bar or higher, an oil-water separator for air source treatment, tap water supply, and a water tank function that combines a front level sensor with outlet filtration. Working dimensions are 2000 x 1000 x 800 mm for the standard frames, with customized dimensions and a customized effective stroke on the KW-526.

Sealing logic: a narrow bead supports tight, high-density gasket lines on small enclosures, while 60 mm capability supports larger perimeter seals in a single pass. Choosing the wrong strip width is a mechanical problem that no certificate can correct.

Use Cases: Industries That Require IP66 and Explosion-Proof Gasket Sealing

The same machine family is applied across eight documented application sectors: explosion-proof electrical and special electrical equipment, electrical control panels, electrical distribution and industrial control, auto parts and components, lighting and LED lighting, home appliances, lock and hardware accessories, and purification, environmental protection and filtration equipment.

These applications share a common operating profile: an ambient working temperature range of -20 to 40 degrees, automatic sealing, dust-proof and explosion-proof sealing for enclosures, 24/7 continuous operation on automatic production lines, and matching with an automatic gluing production line. The declared special requirements are explosion-proof construction and IP66 waterproofing.

Typical gasket tasks include anti-explosion boxes and explosion-proof shells, cable connectors, air filters and air-cleaning filters, lamp covers and LED luminaires, transformer protection covers, water-proof cabinets and boxes, refrigerator and purification room doors, automotive battery covers and inner door handles, and ABS enclosure junction boxes. Each of these parts converts the same two requirements — dust and water ingress on one side, an explosive atmosphere on the other — into one gasket geometry.

Documented Application Result

A practical reference point comes from a US automotive OEM that deployed 20 units in a paint shop environment. After two years of operation, the documented results were stable operation, IP66 waterproof and dust-proof sealing, and high production efficiency. The recorded highlights of the installation were high-precision dispensing, automatic production and a customized gasket shape.

For a buyer evaluating a new line, that case is useful because it shows the two sides of the checklist working together: the sealing result, expressed as IP66 waterproof and dust-proof sealing, and the production model, expressed as automatic production on a continuous line.

Compliance Comparison Table

FAQ

Which certificates should a buyer verify on a PU gasket dispensing machine for explosion-proof enclosure sealing?

Eight documents form the complete file: ATEX certificate ECM 25 ATEX-B D001 from Ente Certificazione Macchine srl (ECM, Notified Body No. 1282) for an explosion-proof enclosure (cabinet) in the EU; CCC certificate 2022012304504287 from the China Quality Certification Center (CQC) for explosion-proof enclosure Model BXK-D1 in China; CE certificate MD-TCF-240307-55472 from GTS for automatic gluing equipment under the 2006/42/EC Machinery Directive; VOC CE certificate ICR/VC/HS230352 from ICR Co. Ltd. for an electric enclosure under EN 60529:1991+A2:2013 and EN 62208:2011; UL94 report THSH25033168768EN from GTS for the foaming adhesive; RoHS certificate UNIB21090613HC-01 from Shenzhen United Testing Technology for sealing foam glue-B; non-hazardous certificate NO.202600234403353 from SICIT for polyurethane sealing foam glue-A under the UN Dangerous Goods Transport Regulations (Maritime); and the ISO 9001:2015 Quality Management System Certificate from NSY Certification (Shanghai) Co., Ltd.

Can a PU gasket dispensing machine produce a gasket that supports IP66 and explosion-proof enclosure sealing?

Yes, when the machine configuration matches the enclosure geometry. KAIWEI PU gasket dispensing machines dispense polyurethane — and, on KW-523, KW-523A and KW-526, silicone — through KW800 or KW-900 mixing heads, with seal strip widths from 2 mm to 60 mm depending on model: 4–30 mm on 520A-PC, KW-520A, KW-520B and KW-510B, and 2–10 mm or 10–60 mm on KW-523 and KW-523A. Mixing ratio is 1–10:1, frames are 3-axis linear robot arms with a 6-axis arm on KW-526, and the documented application result is stable operation, IP66 waterproof and dust-proof sealing, and high production efficiency.

Which configuration choices drive the cost of a PU gasket dispensing machine?

Quotations vary with configuration rather than with a single headline figure. The variables that change the cost are the frame type (3-axis or 6-axis linear robot arm), the mixing head (KW800 or KW-900), the seal strip width range, two-component or three-component capability, the metering pump selection (KAIWEI or Barmag, A 3cc/r and B 0.6cc/r), servo motor options, optional items such as the filling station and water temperature control, manual or automatic tank filling and air charging, customized dimensions, and frame material choice between carbon steel, stainless steel 304 and aluminium alloy. Fixing these variables in the request for quotation is what makes two offers comparable.

Can a sample be validated before a full production order?

Yes. KAIWEI works with a minimum order quantity of 1 set and a lead time of 7 days, performs 100% testing on the machine before shipment, and provides remote after-sales support. Customization options relevant to a validation build include colour and material, automatic feeding for bucket A/B material, mechanical arm, plasma, logo design, elliptical chain worktable, constant temperature water circulation, safety grating, appearance design, automatic switching workbench, three-component configuration and support for 12 languages.

What are the typical MOQ, lead time and monthly capacity, and how do I request the compliance file?

The minimum order quantity is 1 SET, the lead time is 7 days and the monthly capacity is 2000 SET, with 100% test coverage. To move from checklist to quotation, send the enclosure drawing, the target gasket cross-section and the destination market to KAIWEI, and request the compliance package together with the price. The team can be reached at www.sh-kaiwei.com, by email at info@kaiwei-sh.com, or by phone and WhatsApp at 13761986986.

Conclusion

Compliance for a PU gasket dispensing machine is not one certificate; it is a stack of eight documents across four levels. Explosion-proof certification (ATEX and CCC) covers the enclosure side. Ingress protection evidence (VOC CE against EN 60529 and EN 62208) covers the sealing claim. Material compliance (UL94, RoHS and the non-hazardous transport certificate) covers the gasket itself. Machine and factory compliance (CE under 2006/42/EC and ISO 9001:2015) covers the equipment and the organisation behind it.

Buyers who verify in that order — scope first, then issuing body, then certificate number, then standard edition, then validity window, and finally machine-to-application fit — reach a documented decision instead of a documented guess. The specification table in this guide then closes the loop, because a certificate cannot compensate for a seal strip width that does not match the enclosure.

Next Step: Request the Compliance File and a Sample Quotation

Send your enclosure drawing, target gasket cross-section and destination market to receive the ATEX, CCC, CE, VOC CE, UL94, RoHS, non-hazardous and ISO 9001:2015 documents together with a quotation. Minimum order quantity is 1 SET and lead time is 7 days.

Contact: www.sh-kaiwei.com | info@kaiwei-sh.com | Tel / WhatsApp: 13761986986 | No.6433 East Yinggang Road, Qingpu District, Shanghai, China

Download the KAIWEI product catalogue (PDF)