United States

Tolunay-Wong Engineers

10710 S. Sam Houston Parkway West, Suite 100, 77031, Houston, TX, United States

A2LA|698.03A2LA|698.02ISO/IEC 17025Register refreshed 2026-09-25

Certificates

Scope items

Standards

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713-722-7064

rkowis@tweinc.com

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Register record

A2LARefreshed 2026-09-25: 698.03Active; 698.02Active

Accredited standards

Our reading of the A2LA scope: each standard once, with its official name where we have checked it. Click a standard to see the scope line it comes from, word for word.

ASTM

ASTM C29Name not checked yet

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ISO/IEC 17025:2017; ASTM C1077; ASTM D3666; ASTM D3740; ASTM E329; ASTM C29/C29M; ASTM C117; ASTM C127; ASTM C128; ASTM C131/C131; ASTM C136/C136M; ASTM C535; ASTM C702/C702M; ASTM D75/D75M1; Tex-401-A; Tex-402-A; Tex-403-A; Tex-404-A

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ASTM C31Name not checked yet

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Tex-405-A; Tex-406-A; Tex-408-A; Tex-409-A; Tex-410-A; Tex-413-A; ASTM D2726; ASTM D3203/D3203M; ASTM D3549/D3549M; Tex-200-F; Tex-201-F; Tex-206-F; Tex-207-F; Tex-222-F; Tex-225-F; Tex-227-F; Tex-236-F; ASTM C31/C31M1; ASTM C39/C39M; ASTM C42/C42M; ASTM C78/C78M1; ASTM C138/C138M1; ASTM C143/C143M1; ASTM C172/C172M1; ASTM C1731; ASTM C174/C174M; ASTM C192/C192M; ASTM C231/C231M1; ASTM C293/C293M; ASTM C617/C617M; ASTM C1064/C1064M1; ASTM C1231/C1231M; Tex-407-A; Tex-414-A; Tex-415-A; Tex-416-A; Tex-417-A; Tex-418-A

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ASTM C39Name not checked yet

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ASTM C42Name not checked yet

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ASTM C78Name not checked yet

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ASTM C117Name not checked yet

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ASTM C127Name not checked yet

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ASTM C128Name not checked yet

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ASTM C131Name not checked yet

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ASTM C136Name not checked yet

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ASTM C138Name not checked yet

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ASTM C143Name not checked yet

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ASTM C172Name not checked yet

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ASTM C174Name not checked yet

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ASTM C192Name not checked yet

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ASTM C231Name not checked yet

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ASTM C293Name not checked yet

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ASTM C535Name not checked yet

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ASTM C617Name not checked yet

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ASTM C702Name not checked yet

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ASTM C1064Name not checked yet

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ASTM C1077Name not checked yet

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ASTM C1231Name not checked yet

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ASTM C1731Name not checked yet

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ASTM D75Name not checked yet

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ASTM D558Name not checked yet

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Tex-422-A; Tex-423-A; Tex-424-A; Tex-448-A; Tex-450-A; ASTM D558/D558M; ASTM D698; ASTM D1140; ASTM D1557; ASTM D1632; ASTM D1633; ASTM D1883; ASTM D2168; ASTM D2216; ASTM D2487; ASTM D2488; ASTM D4318; ASTM D4718/D4718M; ASTM D5102; ASTM D6276; ASTM D69381; Tex-100-E; Tex-101-E; Tex-103-E; Tex-104-E; Tex-105-E; Tex-106-E; Tex-107-E; Tex-110-E; Tex-111-E; Tex-112-E; Tex-113-E; Tex-114-E; Tex-128-E; Tex-130-E; Tex-141-E; Tex-142-E

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ASTM D698Name not checked yet

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ASTM D1140Name not checked yet

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ASTM D1557Name not checked yet

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ASTM D1632Name not checked yet

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ASTM D1633Name not checked yet

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ASTM D1883Name not checked yet

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ASTM D2168Name not checked yet

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ASTM D2216Name not checked yet

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ASTM D2487Name not checked yet

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ASTM D2488Name not checked yet

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ASTM D2726Name not checked yet

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ASTM D3203Name not checked yet

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ASTM D3549Name not checked yet

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ASTM D3666Name not checked yet

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ASTM D3740Name not checked yet

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ASTM D4318Name not checked yet

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ASTM D4718Name not checked yet

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ASTM D5102Name not checked yet

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ASTM D6276Name not checked yet

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ASTM D69381Name not checked yet

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ASTM E329Name not checked yet

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Scope as published by A2LA

8 lines

A2LA

ISO/IEC 17025

Active

698.03

The scope document we hold says it was valid until 2026-03-31. That date has passed, so our copy may be out of date. We downloaded it from the A2LA register on 2026-03-14. Check the A2LA register for the current scope.

View scope

Accredited scope, certificate 698.03

Line	Discipline	Method	Matrix	Range
1	materials	ISO/IEC 17025:2017; ASTM C1077; ASTM D3666; ASTM D3740; ASTM E329; ASTM C29/C29M; ASTM C117; ASTM C127; ASTM C128; ASTM C131/C131; ASTM C136/C136M; ASTM C535; ASTM C702/C702M; ASTM D75/D75M1; Tex-401-A; Tex-402-A; Tex-403-A; Tex-404-A	Aggregates	-
2	materials	Tex-405-A; Tex-406-A; Tex-408-A; Tex-409-A; Tex-410-A; Tex-413-A; ASTM D2726; ASTM D3203/D3203M; ASTM D3549/D3549M; Tex-200-F; Tex-201-F; Tex-206-F; Tex-207-F; Tex-222-F; Tex-225-F; Tex-227-F; Tex-236-F; ASTM C31/C31M1; ASTM C39/C39M; ASTM C42/C42M; ASTM C78/C78M1; ASTM C138/C138M1; ASTM C143/C143M1; ASTM C172/C172M1; ASTM C1731; ASTM C174/C174M; ASTM C192/C192M; ASTM C231/C231M1; ASTM C293/C293M; ASTM C617/C617M; ASTM C1064/C1064M1; ASTM C1231/C1231M; Tex-407-A; Tex-414-A; Tex-415-A; Tex-416-A; Tex-417-A; Tex-418-A	Concrete	-
3	materials	Tex-422-A; Tex-423-A; Tex-424-A; Tex-448-A; Tex-450-A; ASTM D558/D558M; ASTM D698; ASTM D1140; ASTM D1557; ASTM D1632; ASTM D1633; ASTM D1883; ASTM D2168; ASTM D2216; ASTM D2487; ASTM D2488; ASTM D4318; ASTM D4718/D4718M; ASTM D5102; ASTM D6276; ASTM D69381; Tex-100-E; Tex-101-E; Tex-103-E; Tex-104-E; Tex-105-E; Tex-106-E; Tex-107-E; Tex-110-E; Tex-111-E; Tex-112-E; Tex-113-E; Tex-114-E; Tex-128-E; Tex-130-E; Tex-141-E; Tex-142-E	Freshly Mixed Portland Cement Concrete; Soils; Soil-Cement Mixtures; Soil and Rock; Base Materials; Subgrade, Embankment Soils, and Backfill Material	-
4	materials	For the tests to which this accreditation applies, please refer to the laboratory’s Construction Materials Scope of Accreditation. Accredited Laboratory A2LA has accredited TOLUNAY-WONG ENGINEERS, INC. Houston, TX for technical competence in the field of Construction Materials Testing This laboratory is accredited in accordance with the recognized International Standard ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories. This accreditation demonstrates technical competence for a defined scope and the operation of a laboratory quality management system (refer to joint ISO-ILAC-IAF Communiqué dated April 2017). Presented this 27th day of February 2024. _______________________ Mr. Trace McInturff, Vice President, Accreditation Services For the Accreditation Council Certificate Number 0698.02 Valid to March 31, 2026 Revised February 16, 2026

Ranges are reproduced from the accredited scope document as published. An absent range means the register did not state one. Line numbers are ours, for cross-reference; they follow the order of the scope document.

A2LA

ISO/IEC 17025

Active

698.02

View scope

Accredited scope, certificate 698.02

Line	Discipline	Method	Matrix	Range
1	materials	ISO/IEC 17025:2017; ASTM C1077; ASTM D3666; ASTM D3740; ASTM E329; ASTM C29/C29M; ASTM C117; ASTM C127; ASTM C128; ASTM C131/C131; ASTM C136/C136M; ASTM C535; ASTM C702/C702M; ASTM D75/D75M1; Tex-401-A; Tex-402-A; Tex-403-A; Tex-404-A	Aggregates	-
2	materials	Tex-405-A; Tex-406-A; Tex-408-A; Tex-409-A; Tex-410-A; Tex-413-A; ASTM D2726; ASTM D3203/D3203M; ASTM D3549/D3549M; Tex-200-F; Tex-201-F; Tex-206-F; Tex-207-F; Tex-222-F; Tex-225-F; Tex-227-F; Tex-236-F; ASTM C31/C31M1; ASTM C39/C39M; ASTM C42/C42M; ASTM C78/C78M1; ASTM C138/C138M1; ASTM C143/C143M1; ASTM C172/C172M1; ASTM C1731; ASTM C174/C174M; ASTM C192/C192M; ASTM C231/C231M1; ASTM C293/C293M; ASTM C617/C617M; ASTM C1064/C1064M1; ASTM C1231/C1231M; Tex-407-A; Tex-414-A; Tex-415-A; Tex-416-A; Tex-417-A; Tex-418-A	Concrete	-
3	materials	Tex-422-A; Tex-423-A; Tex-424-A; Tex-448-A; Tex-450-A; ASTM D558/D558M; ASTM D698; ASTM D1140; ASTM D1557; ASTM D1632; ASTM D1633; ASTM D1883; ASTM D2168; ASTM D2216; ASTM D2487; ASTM D2488; ASTM D4318; ASTM D4718/D4718M; ASTM D5102; ASTM D6276; ASTM D69381; Tex-100-E; Tex-101-E; Tex-103-E; Tex-104-E; Tex-105-E; Tex-106-E; Tex-107-E; Tex-110-E; Tex-111-E; Tex-112-E; Tex-113-E; Tex-114-E; Tex-128-E; Tex-130-E; Tex-141-E; Tex-142-E	Freshly Mixed Portland Cement Concrete; Soils; Soil-Cement Mixtures; Soil and Rock; Base Materials; Subgrade, Embankment Soils, and Backfill Material	-
4	materials	For the tests to which this accreditation applies, please refer to the laboratory’s Construction Materials Scope of Accreditation. Accredited Laboratory A2LA has accredited TOLUNAY-WONG ENGINEERS, INC. Houston, TX for technical competence in the field of Construction Materials Testing This laboratory is accredited in accordance with the recognized International Standard ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories. This accreditation demonstrates technical competence for a defined scope and the operation of a laboratory quality management system (refer to joint ISO-ILAC-IAF Communiqué dated April 2017). Presented this 27th day of February 2024. _______________________ Mr. Trace McInturff, Vice President, Accreditation Services For the Accreditation Council Certificate Number 0698.02 Valid to March 31, 2026 Revised February 16, 2026

Location

10710 S. Sam Houston Parkway West, Suite 100, Houston, TX, 77031, US

29.75894, -95.36770

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Other Locations

1 other site in this organization

Corpus Christi, TX, US

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