Rubber Processing Oil Specification: A Comparison Of Heavy Vs Light RPO

Rubber Processing Oil Specification: A Comparison of Heavy vs Light RPO

Rubber Processing Oil (RPO) plays a vital role in the rubber and tire manufacturing industries. As a petroleum-based product, RPO enhances elasticity, improves processing efficiency, and increases the durability of rubber compounds. Selecting the right RPO can significantly impact the performance of the end product. In this article, we’ll explore the specifications of Rubber Processing Oil, compare Heavy RPO vs Light RPO, and help manufacturers make informed sourcing decisions.

What is Rubber Processing Oil (RPO)?

Rubber Processing Oil is a dark, viscous oil derived from petroleum. It is used to soften rubber, improve its flow during processing, and increase flexibility and resilience in the final product. RPO is especially critical in industries producing tires, hoses, gaskets, seals, and other rubber-based goods.

There are different types of RPO based on viscosity, composition, and aromatic content, with Heavy RPO and Light RPO being the most common.

Heavy Rubber Process Oil (RPO): Specifications & Applications

Heavy RPO is an aromatic-rich oil used mainly in tire production and heavy industrial rubber applications. It contains a high concentration of aromatic hydrocarbons, which enhances compatibility with natural and synthetic rubber.

🔧 Key Specifications (Grade 1)

Property	Value	Test Method
Kinematic Viscosity @ 100°C	40–60 cSt	ASTM D-445
Density @ 15°C	995–1020 Kg/m³	ASTM D-1298
Flash Point	265–300°C	ASTM D-92
Aniline Point	50–65°C	IP-2
Sulphur Content	5%	ASTM D-2622
Ash Content	0.15%	ASTM D-482
Carbon Type Analysis	CA: 50%, CN: 5%, CP: 45%	ASTM D-3228

🏭 Applications

Tire manufacturing
Automotive belts and hoses
Industrial rubber products like seals and gaskets
Durable rubber formulations

Light Rubber Process Oil (RPO): Specifications & Applications

Light RPO is ideal for applications requiring lower viscosity and better cold flow properties. It is available in Grade 1 and Grade 2, offering different characteristics for tailored manufacturing needs.

🔧 Light RPO Grade 1 Specifications

Property	Value	Test Method
Kinematic Viscosity @ 100°C	10 cSt	ASTM D-445
Density @ 15°C	1000 Kg/m³	ASTM D-1298
Flash Point	215°C	ASTM D-92
Aniline Point	30°C	IP-2
Sulphur Content	5%	ASTM D-2622
Ash Content	0.1%	ASTM D-482
Carbon Type Analysis	CA: 60%, CN: 1%, CP: 39%	ASTM D-3228

🔧 Light RPO Grade 2 Specifications

Property	Value	Test Method
Viscosity @ 100°C	17–23 cSt	ASTM D-445
Flash Point	250–300°C	ASTM D-92
Pour Point	20–35°C	ASTM D-97
Specific Gravity	0.980–1.02 Kg/m³	ASTM D-4052
Aniline Point	40–60°C	IP-2
Sulphur Content	3–4%	ASTM D-2622
Ash Content	0.05%	ASTM D-482
Carbon Type Analysis	CA: 40%, CN: 25%, CP: 35%	ASTM D-3238

🏭 Applications

Tires and automotive components
Rubber gaskets, seals, and hoses
Enhancing flexibility and processability in rubber formulations

Heavy RPO vs Light RPO: What’s the Difference?

Feature	Heavy RPO	Light RPO
Viscosity	Higher (40–60 cSt)	Lower (10–23 cSt)
Flash Point	Higher (265–300°C)	Moderate (215–300°C)
Aromatic Content (CA)	50%	40–60%
Application	Heavy-duty rubber products	General rubber and elastomer applications
Flexibility	Higher durability	Enhanced processing ease
Aniline Point	Higher	Lower (Grade 1), Moderate (Grade 2)

Why Choose WE Co. for Rubber Processing Oil?

Work and Energy Company (WE Co.) supplies both Heavy and Light RPO in bulk, drums, and flexitanks. With strong refining partnerships and logistics solutions, WE Co. guarantees reliable quality, flexible packaging, and global delivery — all while supporting eco-conscious sourcing practices.

🔹 Backed by German R&D
🔹 Compliant with ASTM standards
🔹 Custom packaging available
🔹 Global delivery: UAE, India, and more

Contact Us

Need help selecting the right base oil or want to request a quote? We’re here to assist you.

WhatsApp: (+971) 585992028
Phone: (+971) 58 599 20 28
Email: info@workandenergy.com
Office Address: No. 106, Sabkha Tower, Deira, Dubai, UAE

Top 10 Most Frequently Asked Questions (FAQs) About Rubber Process Oil

What is rubber process oil used for?
Rubber Process Oil is used to soften rubber, improve mixing and flow, and increase durability in rubber products.
What are the differences between heavy and light RPO?
Heavy RPO has higher viscosity and aromatic content, ideal for tires. Light RPO has better processability and is suited for general rubber goods.
Is RPO safe for the environment?
When sourced from eco-conscious suppliers like WE Co., RPO can be refined with reduced emissions and optimized logistics for lower environmental impact.
Can I use Heavy RPO in light rubber applications?
It’s possible, but it may affect flexibility and processability. Light RPO is better for softer compounds.
What is the shelf life of rubber process oil?
Typically 2–3 years if stored properly in sealed containers, away from heat and sunlight.
Is RPO compatible with all types of rubber?
Yes, especially aromatic RPO which works well with both natural and synthetic rubber.
How is RPO shipped internationally?
It can be shipped in drums, flexitanks, or bulk tankers, depending on customer requirements.
What standards does WE Co. RPO meet?
WE Co. RPO meets ASTM and IP test standards, ensuring global quality compliance.
How is viscosity important in RPO?
Viscosity affects processing speed, blending, and final product performance. Choosing the right viscosity grade is crucial.
Can I get custom packaging for RPO?
Yes, WE Co. offers custom packaging options to suit your manufacturing and storage needs.