Tiangang® HS-300

Name: Tiangang® HS-300
Brand: Tiangang

High Molecular Weight Oligomeric HALS · HS-300

Tiangang® HS-300 is a new high-molecular-weight, low-basicity hindered amine light stabiliser.

In one sentence: A high-molecular-weight low-basicity hindered amine light stabiliser with high active nitrogen content, combining weatherability with long-term heat stability.

Melting range: 110 – 150 °C (source: spec table on this page)
Temperature at 5% weight loss: >300 °C (source: spec table on this page)
Recommended dosage: 0.1 – 0.8% (source: grade description on this page)
Packaging: 20 kg or 25 kg per unit (source: packaging note on this page)

Key Advantages

a) High MW polymeric structure
High MW polymeric structure

b) Low volatility & migration
Low volatility & migration

c) Extraction-resistant, durable
Extraction-resistant, durable

d) Good resin compatibility
Good resin compatibility

Technical Data

Product description	Tiangang® HS-300 is a new high-molecular-weight, low-basicity hindered amine light stabiliser. It has a high active nitrogen content and is characterised by low migration, low blooming and extraction resistance: even a very small addition effectively prevents UV degradation of polymer materials and gives them weathering resistance. The product also markedly improves the long-term thermal stability of polymer materials and can enhance the colour performance of pigmented articles. Its basicity is lower than that of conventional hindered amine light stabilisers, so in harsh environments where it may come into contact with acidic substances such as sulfur- or chlorine-containing compounds it outperforms conventional HALS products.

Product description

Tiangang® HS-300 is a new high-molecular-weight, low-basicity hindered amine light stabiliser. It has a high active nitrogen content and is characterised by low migration, low blooming and extraction resistance: even a very small addition effectively prevents UV degradation of polymer materials and gives them weathering resistance. The product also markedly improves the long-term thermal stability of polymer materials and can enhance the colour performance of pigmented articles. Its basicity is lower than that of conventional hindered amine light stabilisers, so in harsh environments where it may come into contact with acidic substances such as sulfur- or chlorine-containing compounds it outperforms conventional HALS products.

	Appearance	Melting range, °C	Weight loss temperature, °C (5% loss, 20 °C/min, N₂)
Tiangang® HS-300	White or light yellow powder	110 - 150	> 300

Tiangang® HS-300	An addition of 0.1-0.8% is usually enough to markedly improve the UV resistance and weatherability of the material. The exact level should be established by experiment on the customer's own formulation; Tiangang technical or sales representatives can assist.

Tiangang® HS-300	Follow industrial chemical handling practice: handle with care and prevent environmental contamination. Avoid dust and ignition sources. Store the product in a dry, ventilated place away from light.

Tiangang® HS-300	20 or 25 kg cardboard box or fibre drum with an inner liner bag

Frequently asked questions

How do HS-300 and HS-944 compare?

Both are high-molecular-weight polymeric HALS; the practical difference is basicity. Where the system contains sulfur, chlorine or acidic fillers, HS-300 is the first choice. In pure hydrocarbon systems the two behave similarly, so pick on existing formulation and cost.

Does lower basicity cost radical-scavenging efficiency?

Somewhat, yes. But in an acidic environment the activity retained by not being protonated normally outweighs that loss. Conversely, in a fully neutral system the trade-off buys nothing.

How is the loading determined?

From wall thickness, target service life and the other additives in the system. Start low and run a loading ladder to find the cost-performance knee. For the recommended range, refer to the table on this page and the batch COA.

The figures and guidance above follow Tiangang's published technical material and common industry practice. For a specific formulation, refer to the batch COA and the technical agreement between the parties.

Technical reviewTiangang Technical CenterVersion2026-11-07

Specifications and application notes on this page are compiled from Tiangang's published technical data. Actual values are governed by the COA shipped with each lot and the technical agreement confirmed by both parties.

Related Products

BW-10LD HS-330 HS-625 HS-950

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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