Parylene D Dimer – Enhanced Thermal Stability for High-Temperature Electronics
Batch-traceable Parylene D dimer supported by technical documentation, compliance screening, and controlled supply
Parylene D dimer is a double-chlorinated variant of the Parylene family, selected where greater thermal stability and chemical resistance are required beyond standard Parylene C. SCH Services supplies high-purity, batch-traceable Parylene D dimer for use in commercial and R&D deposition systems across electronics, aerospace, medical, and research environments.
This material is supported by controlled specification, batch documentation, and independent third-party screening data, helping customers move from basic material supply to a more structured qualification and compliance position.
Why Choose Parylene D Dimer?
- Higher Thermal Capability – selected where greater temperature tolerance is required than standard Parylene C typically provides.
- Improved Chemical Resistance – double-chlorinated chemistry supports use in more demanding environments.
- Stable Electrical Performance – supports dielectric protection with consistent, low-stress film formation.
- Documented & Traceable – supplied with supporting specification, safety, and batch-level documentation.
Not sure which dimer is right for your application? See our guide to choosing the right Parylene dimer.
Typical Parylene D Dimer Applications
Parylene D is commonly selected where additional thermal margin is needed without moving to fluorinated grades.
- High-temperature sensors and automotive electronic modules
- Power supplies and control electronics
- Industrial and aerospace electronics subject to thermal cycling
- Prototype and R&D environments requiring higher temperature tolerance
Material Specification Summary
SCH Parylene D dimer is supplied as a high-purity solid precursor for chemical vapour deposition (CVD) processes.
- Main component purity: ≥ 95%
- Controlled isomer distribution
- Melting range: 140 – 170 °C
- Loss on drying: ≤ 0.5%
- Appearance: Off-white to white powder
The material is identified in supplier documentation as Tetrachlorotetramethylbenzene dimer. It is supplied to support stable sublimation behaviour, consistent vapour phase deposition, and reproducible coating performance in both development and production environments.
Regulatory & Compliance Support
Parylene D dimer supplied by SCH is supported by controlled documentation and independent screening data for customers working in regulated or high-reliability sectors.
- Safety Data Sheet (SDS) prepared in line with REACH Regulation (EC) No. 1907/2006, CLP Regulation (EC) No. 1272/2008, and Regulation (EU) 2020/878
- Independent SGS screening covering REACH SVHC, RoHS, and extended environmental substance groups
- Batch-level traceability with Certificate of Conformance (CoC)
- Supporting technical documentation available for customer review and qualification activity
This supports customer quality systems, supplier approval work, and technical review processes, but final application suitability and compliance must still be confirmed by the customer within their own process and end-use requirements.
Independent SGS Verification – Parylene D
Independent third-party testing has been carried out by SGS to assess chemical compliance and extended environmental substance status for SCH Parylene D dimer.
- REACH SVHC screening: tested against the latest ECHA Candidate List (253 substances, February 2026) with all substances reported at ≤ 0.1% (w/w) – PASS
- Additional SVHC monitoring: 1 additional potential SVHC substance tested with result reported at ≤ 0.1% (w/w) – PASS
- RoHS (EU Directive 2015/863): all restricted substances below specified limits – PASS
Extended screening has also been completed for key environmental and regulatory substance groups.
- BPA: not detected
- Antimony (Sb): not detected
- Flame retardants including TDCPP, TCEP and SCCP: not detected
- HBCDD: not detected
- Phthalates including DINP, DIDP, DNHP and DNOP: not detected
- Organotin compounds including DBT, TBT, DOT and TPhT: not detected
- PFOS / PFOA: not detected
- PAHs: not detected
Independent SGS data supports the material compliance position shown here. Full underlying reports and summary documents can be provided as supporting references.
Traceability, Packaging & Supply Control
- Batch-based identification and controlled supply
- Certificate of Conformance supplied with each batch
- Documentation retained and available on request
- Controlled packaging designed to minimise moisture ingress
- UK stockholding to support continuity of supply
- Standard packs: 500 g and 1 kg, with other pack formats available on request
This structured supply model supports both development programmes and production environments where traceability and documentation matter.
Supporting Documentation
Supporting documents can be provided to assist technical review, supplier approval, and qualification activity.
- Technical Data Sheet (TDS) – Parylene D Dimer
- Safety Data Sheet (SDS) – Parylene D
- Parylene D Dimer Quality & Compliance Summary
- SGS Test Report – REACH SVHC Screening (253 substances + additional SVHC)
- SGS Test Report – RoHS Compliance
- SGS Test Report – PFOS/PFOA & PAHs
- Certificate of Conformance (CoC)
- IPC-related compliance statement
Handling & Storage (Summary)
Store sealed in original containers under dry, controlled conditions and protect from heat and moisture. Open and handle only within defined process controls. Refer to the applicable SCH SDS, TDS, and internal handling guidance for full details.
Need to define this material on a drawing? See our guide to specifying Parylene coating.
Compare With Other Parylene Dimers
Explore alternative grades and broader selection guidance.
- Parylene C Dimer – balanced moisture and chemical resistance
- Parylene N Dimer – high dielectric strength and excellent penetration
- Parylene D Dimer – higher thermal capability than C
- Parylene F / AF-4 Dimer – fluorinated grade for low dielectric constant and demanding environments
- Parylene Dimers – overview of the full dimer range
Technical Background
For deeper technical guidance on dimer chemistry, selection, and purity control, see:
- Parylene Dimers Hub
- What is Parylene Dimer?
- Parylene Dimer Comparison (N, C, D & AF-4)
- How Dimer Purity Affects Coating Quality
- Choosing the Right Dimer for Your Application
Learn more about general Parylene chemistry.
Request Parylene D Dimer Pricing or Technical Data
Tell us your pack size, required quantity, and delivery location. We will confirm availability, lead time, and the relevant supporting documentation.
📞 +44 (0)1226 249019
FAQs
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Why Choose SCH Services?
Partnering with SCH Services gives you more than material supply. You gain access to a wider platform covering Parylene materials, coating services, equipment, training, and technical support, backed by practical experience in both development and production environments.
- ✈️ 25+ Years of Expertise – practical coating experience across aerospace, medical, defence, automotive, and electronics sectors.
- 🛠️ End-to-End Support – guidance on dimer selection, deposition strategy, equipment, handling, and process support.
- 📈 Scalable Supply – support from R&D quantities through to recurring production demand.
- 🌍 Global Coverage – responsive supply and technical support across the UK, Europe, and international markets.
- ✅ Structured Documentation – supporting traceability, compliance review, and customer qualification activity.
📞 Call: +44 (0)1226 249019
✉ Email: sales@schservices.com
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