Dedicated Material Solutions for New Energy Vehicles

What NEVs bring to the additives industry isa set of entirely new material demands, not just "cars with a new badge". Battery packs, high-voltage harnesses, rooftop PV and charging interfaces do not exist on conventional vehicles, and the combination of weather-resistance, flame-retardancy and thermal-stability demands is entirely different.

NEV interior parts are governed by VOC, odor and fogging regulations on top of weather resistance

I. Material changes driven by GB 38031-2025

The new standard is mandatory and took effect on July 1, 2026

GB 38031-2025 "Safety Requirements for Power Batteries of Electric Vehicles"raises the thermal-propagation requirement from "alarm within 5 minutes" to"no fire, no explosion, and no harmful smoke for occupants within a 2-hour observation period"; it also addsbottom impact (30 mm steel ball, 150 J, 3 strikes) andexternal short circuit after 300 fast-charge cyclestesting. The requirement is stricter than UN R100 and the US FMVSS 305a, and directly raises the bar for flame retardancy and long-term thermal stability of battery-pack housings and module brackets.

1.1 Battery-pack housing and structural parts

Part	Material direction	Key requirements	Tiangang solution
Battery tray / underbody shield	Long-glass-fiber reinforced flame-retardant PP (LGF-PP + halogen-free FR, density approx. 1.2 g/cm3)	UL94 V-0 (1.5 mm); high modulus;long-term thermal stability + outdoor weather resistance	FR-810A (flame retardancy + weather resistance, three-in-one) or XT-8 + antioxidant
Module bracket / connector housing	Glass-fiber reinforced halogen-free FR PA6 / PA66	V-0 (0.8-1.5 mm); service temperature above 120°C	N-OR systems tolerate acidic decomposition products;AO-168 improves processing and long-term thermal stability
High-voltage connector	Flame-retardant + hydrolysis-resistant PBT / PPA	Tracking resistance (CTI); hydrolysis resistance; flame retardancy	Low-alkalinity NOR systems avoid conflict with acidic flame-retardant by-products
Battery top cover	SMC + mica + intumescent FR coating, or thermoplastic FR PA	Flame retardancy + heat resistance + electrical insulation	Can be co-designed with the flame-retardant system

The core tension here remains

Battery-pack housings must be bothhalogen-free flame-retardant andweather-resistant over long-term outdoor service. Intumescent FR systems (APP / MCA) are themselves acidic; they neutralize conventional alkaline HALS and deactivate them -this is the clearest fit for N-OR chemistry (XT-8 / FR-810A). Seen another way: conventional alkaline HALS here are not merely "slightly less effective" - they gradually lose function over time, which is an unacceptable risk.

1.2 Rooftop PV

Encapsulant film	Transmittance	Service life	Notes
ETFE	90–95%	25-35 years	Mainstream today; service range -200 to 150°C; self-cleaning
PVDF	88–91%	About 20 years	Lower fluorine content than ETFE; delamination risk under long-term UV
PET	About 1/5 the cost of ETFE	3-5 years	Pronounced yellowing and hydrolysis; cannot support a 25-year rooftop warranty

ETFE / PVDF are inherently weather-resistant; UV shielding is carried mainly by the base resin, so additive demand is low. Butthe frames, backsheets and adhesive seals of rooftop PVstill need HALS together with UV absorbers to prevent yellowing and seal failure under long-term UV.

1.3 Charging interfaces and cables

Charging-gun housings commonly use PC, PBT and PA66-GF25; cable jackets mostly use TPE / TPU / PUR. Key metrics include:flame retardancy (UL94 V-0), -30 to +50°C service, UV weather resistance, over 10,000 mating cycles, IP55/IP65 protection, plus RoHS / REACH compliance. Because charging guns sit outdoors for long periods,UV stability and flame retardancy must be delivered together, so material selection favors solving both in one step rather than two separate additions.

1.4 Thermal-management lines

Cooling lines in NEVs commonly use PPS / PA12 three-layer tubing (inner PPS + adhesive layer + outer PA12), with service temperatures up to 130°C and low ion extraction required to protect the electrochemical system. Antioxidant systems are especially critical under this kind of sustained high temperature -AO-1010 + AO-168 is a common thermal-stability pairing, while the blended AO-B215 completes the primary + secondary antioxidant match in a single addition.

II. Selection logic for NEV scenarios

Scenario	Primary need	Key products
Battery-pack housing / tray	Flame retardancy + weather resistance + acid tolerance without failure	FR-810A / XT-8
Module bracket / connector	Flame retardancy + long-term thermal stability	XT-8 + AO-168
High-voltage harness jacket	Halogen-free FR + aging resistance	FR-810A + AO-B215
Charging gun / cable	Flame retardancy + UV weather resistance + low-temperature toughness	FR-810A; for coating systems, HS-112
Rooftop PV backsheet / frame	Anti-yellowing + weather resistance	HS-944 / UV-360 / HS-3310
Thermal-management lines	Long-term thermal stability at high temperature	AO-B215 / AO-1010

For formulation discussions on specific NEV components, or to request product technical data sheets (TDS) and safety data sheets (SDS), contact us directly. Related products: see also ③ Harness, Electrical & Flame Retardancy.

Last Updated: 2026-10-20

Certifications

National High-Tech Enterprise
Vice Chairman Unit, China Plastics Processing Industry Association (CPPIA)
Vice Chairman Unit, Agricultural Plastics Branch, China Agricultural Plastics Application Technology Society
Member, Ageing Methods Subcommittee, National Technical Committee on Plastics (SAC/TC15/CS5)
Member, Society of the Plastics Industry (SPI), USA

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