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

25–48 of 157 products

4-Benzoylbutyric acid, LR

CAS: 1501-05-9
Formula: C₁₁H₁₂O₃
MW: 192.21 g/mol

ZX-019637

4-Biphenylcarboxylic acid, LR

CAS: 92-92-2
Formula: C₁₃H₁₀O₂
MW: 198.22 g/mol

ZX-019638

4-Chlorobenzenesulphonyl chloride, LR

CAS: 98-60-2
Formula: C₆H₄Cl₂O₂S
MW: 211.06 g/mol

ZX-019639

4-Methylbenzophenone, LR

CAS: 134-84-9
Formula: C₁₄H₁₂O
MW: 196.24 g/mol

ZX-019690

4-Nitrobenzamide, LR

CAS: 619-80-7
Formula: C₇H₆N₂O₃
MW: 166.13 g/mol

ZX-019694

4',4-Bischloromethyldiphenyl, LR

CAS: 1667-10-3
Formula: C₁₄H₁₂Cl₂
MW: 251.1 g/mol

ZX-019635

5-Bromonicotinic acid, LR

CAS: 20826-04-4
Formula: C₆H₄BrNO₂
MW: 202.01 g/mol

ZX-019640

5-Hydroxyisophthalic acid, LR

CAS: 618-83-7
Formula: C₈H₆O₅
MW: 182.13 g/mol

ZX-019641

Acacia, IP, LR

CAS: 9000-01-5

ZX-038384

Acetylcholine iodide, LR

CAS: 2260-50-6
Formula: C₇H₁₆INO₂
MW: 273.11 g/mol

ZX-038357

ALGINIC ACID (Meets specification, BP/EP/Ph. Eur., LR

CAS: 9500-32-7

ZX-019643

Amberjet 4600cl, LR

CAS: 63181-94-2

ZX-019645

Amberlite irc-86 rf, LR

CAS: 211811-37-9

ZX-019646

Amberlite irp 69, LR

CAS: 55464-99-8

ZX-019647

Amberlite XAD 4, LR

CAS: 37380-42-0
Formula: C₄₇H₄₅ClFN₃O₅
MW: 786.3 g/mol

ZX-019649

Amberlite xad-1180 N, LR

CAS: 97396-56-0

ZX-019648

Amberllite IRC120 H, hydrogen form, LR, specially dried, technical grade

CAS: 39389-20-3

ZX-038555

Amido black 10B, LR, for spectroscopy, for electrophoresis

CAS: 1064-48-8
Formula: C₂₂H₁₄N₆Na₂O₉S₂
MW: 616.5 g/mol

ZX-038197

Aminodiphenylmethane, LR

CAS: 91-00-9
Formula: C₁₃H₁₃N
MW: 183.25 g/mol

ZX-019650

Ammonium carbonate, LR ≥30.00%

CAS: 8000-73-5
Formula: C₂H₁₁N₃O₅
MW: 157.13 g/mol

ZX-019520

Ammonium ferric citrate (brown), IP, LR

CAS: 1185-57-5
Formula: C₆H₁₁FeNO₇⁺3
MW: 265 g/mol

ZX-038562

Atropine sulphate, IP/BP/USP/EP/Ph. Eur., LR 99.0–101%

CAS: 5908-99-6
Formula: C₃₄H₅₀N₂O₁₁S
MW: 694.8 g/mol

ZX-037687

Barium perchlorate, LR ≥98%

CAS: 13465-95-7
Formula: BaCl₂O₈
MW: 336.23 g/mol

ZX-038397

Bees wax, LR, for microscopy

CAS: 8012-89-3

ZX-037216

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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