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Chemotechnique Diagnostics (CT) is recognized as the world's leading patch test company with the most complete range of 550 haptens distributed in over 90 countries. These contamination free haptens, test chambers and accessories are produced under stringent GMP pharmaceutical controls. CT functions under the ISO13485 and ISO9001 Quality Management systems. CT is audited and licensed by the Medical Products Agency (MPA), "Sweden's FDA". CT is committed to the global advancement of contact dermatitis and the field of occupational dermatology through its extensive Research and Development program. To this end CT works cooperatively with the world's leading contact dermatitis associations (ICDRG - International Contact Dermatitis Research Group; EECDRG - European Environmental and Contact Dermatitis Research Group; NACDG - North American Contact Dermatitis Group) to facilitate dermatological investigations where patch tests are involved.
Chemotechnique Diagnostics - the trusted name in patch testing!

NIK-L-BLOK TM Barrier Cream

  • Traps Nickel Ions
  • Traps Cobalt Ions
  • Fragrance Free
Clinically Tested & Proven Effective!
Protects against eczema induced by nickel & cobalt!

The Hydroperoxides of Linalool and Limonene

Linalool is a naturally occurring terpene alcohol chemical found in many flowers and spice plants with many commercial applications, the majority of which are based on its pleasant scent.
Limonene takes its name from the lemon, as the rind of the lemon, contains considerable amounts of this compound, which contributes to the odor.
Both fragrances are very common in cosmetic products, such as perfumes and creams. The hydroperoxides are formed when Limonene and Linalool are exposed to sunlight and air.
Now available as H-031 -Hydroperoxides of Linalool and H-032 -Hydroperoxides of Limonene


Meetings & Conventions

31st Annual Meeting of the
American Contact Dermatitis Society
(ACDS) Thursday, March 19th, 2020
Denver, CO

SAVE THE DATES...ACDS Mid-Year Meeting
September 25 and 26, 2020
Philadelphia, PA
Wyndham Philadelphia Historic District Hotel

78th Annual Meeting of
American Academy of Dermatology
(AAD) March 20 through 24, 2020
Colorado Convention Center 700 14th St.
Denver, CO 80202
Exhibit dates and hours:
  • Friday, March 20th, 10am to 5pm
  • Saturday, March 21st, 10am to 5pm
  • Sunday, March 22nd, 10am to 3pm
Visit: Chemotechnique Diagnostics/Dormer Laboratories Inc., Exhibit 3516

Annual Meetings...
Canadian Dermatology Association / Association canadienne de dermatologie
website: / Site Web:
95th - 2020: Ottawa, Ontario - Wednesday, June 24 to Saturday, June 27 - The Westin Ottawa
96th - 2021: Vancouver, BC - Wednesday, June 23 to Saturday, June 26 - The Westin Bayshore


Effective January 1st, 2020 changes have been made to the following series: B-1000, C-1000, CAD-1000, E-1000, IS-1000, MA-1000, MP-1000, NAP-1000, PG-1000 and TF-1000

Hydrogen Peroxide H-006 is no longer available

Lead(II)acetate trihydrate 0.5%/aq (L-007) removed from the Metal Series. An unanticipated raw material alteration has rendered the possibility of producing Lead(II)acetate trihydrate 0.5%/aq (L-007) to an adequate standard impossible. As a result we have removed this hapten from our portfolio and from the Metal Series MET-1000 immediately. Please note that the Metal Series will still include a hapten marker for lead, L-008 Lead(II)chloride 0.2%/aq.

The hapten DOR-686 Methyldibromo Glutaronitrile + phenoxyethanol (EUXYL K ) is no longer available. However the two components of this hapten mixture are available as D-049E Methyldibromo glutaronitrile (0.5% pet) and P-025 2-Phenoxyethanol (1% pet)  

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