Is LR grade good enough for a recrystallisation solvent?

Usually yes. Recrystallisation removes most impurities from the product, and residual solvent is dried off. If the final compound is an analytical standard, a higher grade solvent reduces the risk of carrying over non-volatile residue.

Why does an LR product sometimes have a high assay?

Many LR chemicals are made from the same production run as purer grades but tested against fewer parameters. The assay can therefore be high, but impurities that are not listed on the specification have not been controlled.

Should teaching labs buy LR or AR?

For most practical classes LR is sufficient and cheaper. Titration experiments where students calculate a concentration benefit from AR grade primary standards, so many teaching labs keep a small stock of both.

Chemical grade

LR Grade (Laboratory Reagent) chemicals

Good-quality, economical chemicals for synthesis, teaching and general laboratory work where trace impurities do not matter.

157 products in this grade

LR Grade (Laboratory Reagent) products

73–96 of 157 products

Dimethicone, LR

CAS: 9006-65-9

ZX-038619

Diphenylamine sulphate, LR

CAS: 587-84-8
Formula: C₁₂H₁₃NO₄S
MW: 267.3 g/mol

ZX-019672

dl-Mandelic acid, LR

CAS: 611-72-3
Formula: C₈H₈O₃
MW: 152.15 g/mol

ZX-019687

Dodeca-molybdophosphoric acid sodium salt hydrate, LR

CAS: 1313-30-0
Formula: Mo₁₂Na₃O₄₀P
MW: 1891.3 g/mol

ZX-019692

EGTA, 0.5 M Sterile (pH 8.0), LR ≥97.00%

CAS: 67-42-5
Formula: C₁₄H₂₄N₂O₁₀
MW: 380.35 g/mol

ZX-038302

Erythromycin, BP/USP, LR

CAS: 114-07-8
Formula: C₃₇H₆₇NO₁₃
MW: 733.9 g/mol

ZX-038621

Ethylamine solution, 2.0 M in THF, LR 70%

CAS: 75-04-7
Formula: C₂H₇N
MW: 45.08 g/mol

ZX-038623

Ethylenediaminetetra acetic acid calcium disodium salt, LR

CAS: 39208-14-5
Formula: C₁₀H₁₄CaN₂Na₂O₉
MW: 392.28 g/mol

ZX-019673

Ferrous sulphide, fused stick, LR, technical grade

CAS: 1317-37-9
Formula: FeS
MW: 87.91 g/mol

ZX-038628

Fluorine doped tin oxide coated glass slide L × W × D 100 mm × 100 mm × 2.3 mm, surface resistivity ~7 Ω/sq

ZX-017327

Fluorine doped tin oxide coated glass slide L × W × D 300 mm × 300 mm × 2.2 mm, surface resistivity ~7 Ω/sq

ZX-017328

Gadolinium sulphate, LR

CAS: 13628-54-1
Formula: Gd₂O₁₂S₃
MW: 602.7 g/mol

ZX-019675

Gum xanthan, LR, food grade (FCC)

CAS: 11138-66-2

ZX-038386

Hexamethyldisilathiane, synthesis grade

CAS: 3385-94-2
Formula: C₆H₁₈SSi₂
MW: 178.44 g/mol

ZX-010181

Hydrocortisone, LR, for spectroscopy

CAS: 50-23-7
Formula: C₂₁H₃₀O₅
MW: 362.5 g/mol

ZX-038352

Hydrogen Peroxide Solution 35-50%, BP, LR

CAS: 7722-84-1
Formula: H₂O₂
MW: 34.02 g/mol

ZX-038641

Indion 454 ion exchange resin, LR

CAS: 11041-12-6

ZX-019678

Indium oxide coated PET surface resistivity ≤10 Ω/sq, slide

Formula: In₂O₃
MW: 277.63 g/mol

ZX-017331

Indium tin oxide coated glass slide, rectangular (surface resistivity 70-100 Ω/sq, slide)

CAS: 50926-11-9
Formula: InOSn
MW: 249.53 g/mol

ZX-014320

INDOLINONE [1-(2,6-dichlorophenyl)-2-indolinone], LR

CAS: 15362-40-0
Formula: C₁₄H₉Cl₂NO
MW: 278.1 g/mol

ZX-038643

Ion Exchange Resin 20-50 mesh, LR, for spectroscopy

CAS: 9002-23-7

ZX-038554

Kerosene, LR

CAS: 8008-20-6

ZX-019679

L-Ascorbic acid, LR, food grade (FCC) 99.7%

CAS: 50-81-7
Formula: C₆H₈O₆
MW: 176.12 g/mol

ZX-038648

L-Menthol, IP/BP/USP, LR

CAS: 2216-51-5
Formula: C₁₀H₂₀O
MW: 156.26 g/mol

ZX-038673

Compare with other grades

HPLC Grade GC Grade AR Grade (Analytical Reagent)ACS Grade Extra Pure Grade Molecular Biology Grade Spectroscopy Grade LC-MS Grade IP Grade (Indian Pharmacopoeia)BP Grade (British Pharmacopoeia)USP Grade (United States Pharmacopeia)Ph. Eur. Grade (European Pharmacopoeia)Food Grade (FCC)Technical Grade Electronic Grade Deuterated and Stable-Isotope-Labelled Compounds Pharmaceutical Secondary Reference Standards Grades guide

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