Bitumen 60/70 Penetration Grade Specification For Asphalt And Waterproofing

Bitumen 60/70 penetration grade specification for asphalt and waterproofing describes a paving-grade binder graded by how far a standard needle sinks into it at 25°C — a penetration of 60 to 70 tenths of a millimetre. It is the mid-range penetration grade referenced across national and international paving standards, and it is the grade BHD Group supplies as bitumen 60/70 (source: facts/bitumen.yaml, penetration_25c: 60/70). Buyers ask for it by name because road and waterproofing specifications call it out directly.

Who this guide is for

This bitumen 60/70 penetration grade specification for asphalt and waterproofing overview is written for three readers. Road and asphalt contractors need to confirm a binder meets the penetration grade named in a paving specification before it goes into a mix design. Roofing and waterproofing contractors need to know where 60/70 fits against built-up bituminous membrane requirements. Procurement and QC managers need a checklist they can hand to a lab and a supplier before a shipment is confirmed. Each section below answers one of those three questions directly.

What "60/70 penetration grade" actually measures

Penetration grading sorts bitumen by consistency, not by chemistry alone. A needle carrying a fixed weight is lowered into a bitumen sample held at 25°C for five seconds; how far it sinks, in tenths of a millimetre, is the penetration value. ASTM D5/D5M is the standard test method for this measurement, and reliable results depend on controlling several variables — sample preparation, temperature control and equipment calibration among them — which is why ASTM recommends following D3666 or a similar guideline to evaluate and control testing quality (ASTM International, undated).

ASTM D946/D946M is the companion specification standard. It covers penetration-graded asphalt binders across five bands — 40-50, 60-70, 85-100, 120-150 and 200-300 — for binders manufactured by refining crude petroleum (ASTM International, undated). 60/70 sits in the middle of that range: softer than 40-50, firmer than 85-100.

Why the grade band matters to a mix designer

A lower penetration number means a harder, stiffer binder; a higher number means a softer one. Climate, traffic loading and pavement layer all influence which band a specification calls for. Because the number is a physical test result rather than a marketing label, it travels across borders and standards bodies with the same meaning, even when the surrounding specification language differs.

How the grade differs across national standards

Terminology and exact limits vary by country even though the underlying test is comparable. The IARC bitumen monograph notes that penetration grades of straight-run bitumen commonly used in Europe range from 15-PEN to 450-PEN, with country-specific naming conventions (IARC / NCBI Bookshelf, undated). EN 12591:2009 sets the European framework for specifying paving-grade bitumens for roads and airfields, and it notes that bitumens specified under it can also serve industrial applications, which are separately specified under EN 13305 (CEN, 2009). India's IS 73:2013, published by the Bureau of Indian Standards, is that country's paving bitumen specification (Bureau of Indian Standards, 2013). New Zealand's NZTA M01:2022 sets the physical characteristics required of bitumen used in New Zealand pavements and references ASTM D5 for penetration testing (NZ Transport Agency Waka Kotahi, 2022).

How the 60/70 grade is used in road and asphalt work

This bitumen 60/70 penetration grade specification for asphalt and waterproofing explained for a paving contractor: the grade is named directly in national paving specifications, so a project's mix design will typically cite a penetration band rather than a brand or supplier. A 1985 field trial by the Vermont Agency of Transportation compared 60/70 penetration asphalt against 85/100 penetration asphalt on U.S. Route 302, an early example of agencies testing penetration-grade choice against real pavement performance (Vermont Agency of Transportation, 1985). The Asphalt Institute and Eurobitume's joint publication IS-230 covers bitumen production, chemistry, use, specification and occupational exposure for readers who want the fuller technical picture (Asphalt Institute & Eurobitume, undated).

What a road contractor should confirm before ordering

Match the penetration band named in the project specification to the certificate of analysis before accepting delivery. If the specification cites EN 12591:2009, note that the current edition also carries a normative annex for calculating the penetration index, a related but distinct value from raw penetration (National Standards Authority of Ireland, 2009-01-01).

How the 60/70 grade applies to waterproofing work

Built-up bituminous waterproofing membranes are a separate application from road paving, but they draw on the same penetration-grade vocabulary. U.S. Department of Veterans Affairs specification Section 07 12 00 covers impervious built-up membranes of bituminous materials used for waterproofing and requires certificates confirming the material conforms to the contract specification (U.S. Department of Veterans Affairs / NIBS WBDG, 2023-10-01). A roofing or waterproofing contractor evaluating a bitumen 60/70 penetration grade specification for asphalt and waterproofing supply should ask the same question a road contractor asks: does the certificate match the penetration band the project specification calls for.

Standards at a glance

What to check before you order

• Confirm the penetration band named in your project specification matches 60/70, not an adjacent band such as 40-50 or 85-100.
• Ask for a current certificate of analysis showing the penetration test result at 25°C.
• Confirm which national or international standard the certificate is tested against (ASTM, EN, IS, NZTA or equivalent).
• For waterproofing membrane work, confirm the certificate conformance language matches your contract specification, not just the penetration number.
• Check the test method reference on the certificate — ASTM D5/D5M or an equivalent — rather than accepting a penetration figure with no method cited.
• Where a project specification is written to EN 12591:2009, confirm whether a penetration index calculation is also required.
• Align delivery volume and timing with your project schedule before confirming the order.

Working with BHD Group

BHD Group operates through two divisions, BHD Chemical and BHD Sourcing — one accountable house behind both. Bitumen 60/70 is supplied through BHD Chemical alongside the division's other industrial goods, including carbon black grades from N220 through N660 and P-8201, and base oils such as SN-500. We state the grade plainly and back it to the fact on file rather than adding language a penetration test does not support. Buyers evaluating a bitumen 60/70 penetration grade specification for asphalt and waterproofing tips checklist are welcome to request our certificate of analysis before confirming volume and delivery.

Sources

• Asphalt Institute & Eurobitume — The Bitumen Industry — A Global Perspective (IS-230, 4th Edition)
• Bureau of Indian Standards (2013) — IS 73:2013 Paving Bitumen — Specification
• NZ Transport Agency Waka Kotahi (2022) — NZTA M01:2022 Specification for Bitumen
• ASTM International — ASTM D946/D946M-20 Standard Specification for Penetration-Graded Asphalt Binder
• ASTM International — ASTM D5/D5M-20 Standard Test Method for Penetration of Bituminous Materials
• CEN, via iTeh Standards (2009) — EN 12591:2009 Bitumen and Bituminous Binders — Specifications for Paving Grade Bitumens
• National Standards Authority of Ireland (2009-01-01) — I.S. EN 12591:2009
• IARC / NCBI Bookshelf — Bitumens and Bitumen Emissions (IARC Monographs)
• Vermont Agency of Transportation, Materials & Research Division (1985-01) — Experimental Use of 60/70 Penetration Asphalt Compared to 85/100 Penetration Asphalt on U.S. Route 302
• U.S. Department of Veterans Affairs / NIBS WBDG (2023-10-01) — Section 07 12 00 — Built-Up Bituminous Waterproofing